The talk will review information gained on the phase diagram of strongly
interacting matter from low to high net baryon densities. It will cover
the liquid gas phase transition and focus on the chiral phase transition
and deconfinement at high temperature. At the LHC experimental data point
to the formation on deconfined matter in a net-baryon free hot fireball,
conditions as encountered...
The purpose of COMPASS is the study of hadron structure
and hadron spectroscopy with high intensity muon and hadron beams.
The Collaboration is formed by about 200 physicists from 25 countries.
The facility was approved 25 years ago and the physics experiments
started in 2002 with a muon beam, polarised proton and deuteron
targets. These semi-inclusive deep inelastic scattering...
Streaming Readout has been adopted as the paradigm of data acquisition (DAQ) at many major experiments at LHC, RHIC, and the future EIC. Distinct from the traditional triggered readout, streaming DAQs rely on modern digital data processing for large factors of data reduction, which opens unique opportunities for the application of AI/ML that is high throughput, low latency, energy efficient,...
Recent results of coupled channel partial wave analyses with various $\bar{p}p$-annihilation, $\pi\pi$- and $\pi^-p$-scattering data performed with the powerful and user-friendly PAWIAN (Partial Wave Interactive Analysis) package will be presented. By considering analyticity and unitarity conditions using the K-matrix approach with Chew-Mandelstam functions, pole positions and decay branching...
The Quark–Meson–Coupling (QMC) model self-consistently relates the dynamics of the internal quark structure of a hadron to the relativistic mean fields arising in nuclear matter. The QMC energy density functional (EDF) was successfully employed to investigate several ground state properties of even-even finite nuclei across the nuclear chart. In this presentation, the latest developments in...
Since the properties of the initial state of heavy-ion collisions are not directly accessible in experiments, there currently exists a variety of different models employed in fluid dynamic simulations of heavy-ion collisions.
In this talk I will give a brief overview over different initial-state models and introduce a new method to characterize initial density profiles by decomposing them in...
The quark-gluon dynamics manifests itself in a set of non-perturbative functions describing all possible spin-spin and spin-orbit correlations. Single and Dihadron semi-inclusive and hard exclusive production, both in current and target fragmentation regions, provide a variety of spin and azimuthal angle dependent observables, sensitive to the dynamics of quark-gluon interactions. Studies...
I review recent developments in the application of machine learning techniques to problems in nuclear theory, with a particular emphasis on generative models for lattice quantum field theory.
The primary goal of the GlueX experiment at Jefferson Lab is to search for and map the spectrum of light hybrid mesons. Many experiments have studied and reported evidence of exotic mesons decaying into $\eta\pi$ and $\eta'\pi$ final states. GlueX, which has a linearly polarized photon beam and a large acceptance for both charged and neutral particles, has access to both the neutral, $\gamma...
Systems of few interacting neutrons have long fascinated nuclear physicists,
with ample of theoretical and experimental activity throughout the decades.
Interest in these systems has recently surged in light of new indications that
few-body resonances comprised of neutrons may exist in nature. In this talk, I
will present studies of few-neutron systems based on pionless effective...
Ultra-relativistic heavy-ion collisions are expected to produce some of the strongest magnetic fields ($10^{13}$ $-$ $10^{16}$ Tesla) in the Universe. The initial strong electromagnetic fields have been proposed as a source of linearly-polarized, quasi-real photons that can interact via the Breit-Wheeler process to produce $e^{+}e^{-}$ pairs.
In this talk, we will present latest STAR...
Exclusive reactions measured at the intensity frontier open new opportunities to study QCD. Processes in a multi-dimensional phase space require adequate tools to take advantage of correlations between variables that embed the underlying strong-force interaction. To extend our capability of interpreting multi-dimensional data and fully reconstruct correlations between final state particles, we...
A realistic description of atomic nuclei, in particular light nuclei characterized by clustering and low-lying breakup thresholds, requires a proper treatment of continuum effects. We have developed an approach, the No-Core Shell Model with Continuum (NCSMC) [1,2], capable of describing both bound and unbound states in light nuclei in a unified way. With chiral two- and three-nucleon...
We calculate, from Lattice QCD, the elastic $\pi \pi$ scattering amplitude in the isoscalar $I=0$ channel, and determine the $\sigma$ estate. We extract its lineshape for two different quark masses corresponding with $m_\pi \sim 330$ and $283$ MeV; where it is predicted that this state transitions from bound to virtual bound. In order to provide an accurate picture we use a high statistics...
We demonstrate that paradigm shift from considering deuteron as a system of bound proton
and neutron to considering it as a pseudo-vector system in which we observe proton and neutron, results in a possibility of probing a new "incomplete" P-state structure on the light-front (LF), at extremely large internal momenta, which can be achieved at high energy transfer electro-disintegration of...
Jefferson Laboratory (JLab) is home to the Continuous Electron Beam Accelerator Facility (CEBAF) and four experimental physics halls. JLab’s data science portfolio includes projects to advance research in nuclear physics, accelerator facilities, and engineering. With a specific focus on expanding capabilities in machine learning (ML)-based uncertainty quantification, design and control, and...
The primary goal of the ultrarelativistic heavy-ion collision program at the LHC is to study the quark-gluon plasma (QGP) properties, a state of strongly interacting matter that exists at high temperatures and energy densities. However, the lack of knowledge on the initial conditions of heavy-ion collision results in significant uncertainty in the extraction of the transport properties of...
In this talk I will revisit the evolution of generalised parton distributions (GPDs) in momentum space.
I will present a recalculation of the evolution kernels in the MSbar scheme at one-loop accuracy, confirming previous results.
The kernels are arranged in a form suitable for numerical implementation allowing for an easy implementation in an existing open source code (APFEL++).
I will...
We present a first calculation of the $K\gamma \to K\pi$ transition amplitude in the presence of a resonant $K^*$ from lattice quantum chromodynamics. In this process, the kaon interacts with a photon and scatters strongly to a $K\pi$ in the final state. The $K\pi$ state is in a lowest relative $S$ $\&$ $P$-wave, with the $K^*$ resonance appearing in the $P$-wave.
The matrix elements for the...
First proposed by Nobel laureate Weinberg in the early 1990s, the so-called Weinberg chiral nuclear force has become the de facto standard for ab initio nuclear structure and reaction studies. However, unlike atomic physics and chemistry, the application of relativistic ab initio methods in nuclear physics is just emerging. An important factor hindering their development is the lack of modern...
Artificial Intelligence (AI) for design is a relatively new but active area of research but when it comes to detector design, surprisingly this is an area of applications at its infancy.
Nonetheless the Electron Ion Collider (EIC), the future ultimate machine to study the strong force, utilized AI starting from the design phase. EIC is a large-scale experiment with an integrated detector...
Generalized Parton Distributions (GPDs) are nowadays the object of an intense effort of research,
in the perspective of understanding nucleon structure. They describe the correlations between
the longitudinal momentum and the transverse spatial position of the partons inside the nucleon
and they can give access to the contribution of the orbital momentum of the quarks to the...
Using the world’s largest samples of J/psi and psi(3686) events produced in e+e- annihilation, BESIII is uniquely positioned to study light hadrons in radiative and hadronic charmonium decays. In particular, exotic hadron candidates including multiquark states, hybrid mesons and glueballs can be studied in high detail. Recent highlights from the light hadron spectroscopy program, including the...
Exact solutions for energy eigenvalues and eigenstates for transitional nuclei in the spd-interacting boson model are found by using an infinite dimensional algebraic method. It has been shown that the spd-IBA is a quite powerful model for analyzing nuclear structures. In this lecture, we have studied the GDRs within an extended pairing model with a focus on spectral statistics. The effect of...
We present the most recent extraction of unpolarized transverse-momentum-dependent (TMD) parton distribution functions (PDFs) and TMD fragmentation functions (FFs) from global data sets of Semi-Inclusive Deep-Inelastic Scattering (SIDIS), Drell-Yan and Z boson production. The fit is performed at the N$^3$LL logarithmic accuracy in the resummation of q$_T$-logarithms and features flexible...
Significant progress has been realized in studies of excited nucleon state structure (N program) from the data on exclusive meson electroproduction measured with the CLAS detector in Hall B at Jefferson Laboratory (JLab). Studies of N program give us the unique opportunity to explore the complex interplay of quark-gluon and meson-baryon degrees of freedom in the N* structure and the...
The collisions of heavy nuclei at ultra-relativistic LHC energies produce an extreme phase of strongly-interacting matter called the quark-qluon plasma (QGP). Since more than 10 years the ALICE Collaboration at CERN has been studying the nature of the QGP by analysing the data from various collision types provided by the LHC: proton-proton, proton-nucleus and nucleus-nucleus. Here, the results...
Relativistic nuclear collision experiments explore the physics of dense and hot nuclear matter, the so-called quark-gluon plasma (QGP). The bulk properties of such matter can be inferred indirectly from the yields and correlations of the produced hadrons. Nevertheless, the relevant degrees of freedom of the QGP and are subject to the effects of multiple rescatterings and non- perturbative...
Recently structures in invariant mass distributions and excitation energy spectra have been attributed to triangular singularities as discussed in e.g., [1, 2] and in the review by Guo et al.[3]. These singularities emerge under specific kinematic conditions when new reaction channels open up. It will be shown that a triangular singularity associated with the opening of the γp → pa0 → pπ0η...
The new results from the Bonn-Gatchina partial wave analysis are presented. The new solution includes the new data on the meson production off the neutron and the data on the omega-meson photoproduction. The spectrum and properties of the observed baryons are discussed.
Semi-Inclusive Deep Inelastic Scattering on nuclei offers a new way to gain microscopic information about the mechanisms of parton propagation and hadron formation in QCD. The interactions with the nuclear medium of the partonic and hadronic participants in the hadronization process can reveal features of that process at the femtometer distance scale. New data from CLAS on baryon hadronization...
This talk presents a new measurement studying the relationship between the production of hard and soft particles through the correlation of Upsilon meson states with the inclusive charged particle yields in 13 TeV pp collisions. These correlations, and in particular their comparison between excited and ground state Upsilons meson, lead to surprising conclusions about heavy quarkonium...
Study of the QCD phase diagram is important for understanding the physics of the early universe and the interiors of high-density stars. Recently, experiments such as RHIC or GSI have been conducted to explore a wide range of the phase diagram including the QCD critical point. From theoretical analyses, there are many previous studies using lattice QCD or effective models. However, the full...
The thrust distribution associated with single-inclusive $e^+e^-$ annihilation (SIA$^{\text{thr}}$), sensitive to the transverse momentum of the detected hadron with respect to the thrust axis, represents one of the most challenging and promising case where to extend the TMD factorization beyond the standard processes. At present days, its factorization properties have been studied through two...
The FROST experiment at Jefferson Lab used the CLAS detector in Hall B with the intention of performing a complete and over-determined measurement of the polarization observables associated with strangeness photoproduction, in combination with data from previous JLab experiments as part of the N* program. This was achieved by utilizing the FROST polarized target in conjunction with polarized...
In the recent years, it has been realized that deep-inelastic scattering with polarization control could provide a variety of spin and azimuthal angle dependent observables sensitive to the quark-gluon interactions. New parton distributions and fragmentation functions have been introduced to describe the rich complexity of the hadron structure and move towards a multi-dimensional imaging of...
The exact dynamics of the quarks and gluons inside the nucleon are a long-standing question in hadron physics. To shed more light on this topic, the excitation spectrum of the nucleons needs to be measured and compared to theoretical models like constituent quark models or lattice QCD calculations. Until now, most of the predicted resonances - especially at high masses - have not been found by...
Recently, the LHCb and BES III experiments have reported several exotic flavor states which cannot be accomodated into $q\bar{q}$ states. Theoretical predictions of some of these states were made. We revisit the hidden-gauge formalism in coupled channels and the predictions made about states with (I=0;C=1;S=-1), (I=0;C=2;S=0,1) and (I=1;C=0;S=-1). Some of these states could be bound states,...
The Relativistic Heavy Ion Collider (RHIC) is the only collider in the world that is capable of colliding heavy ion and polarized proton-proton beams. RHIC has been producing high-impact results for more than two decades. In this talk, I will present some of the recent RHIC results from PHENIX and STAR experiments. I will also provide a future outlook as we complete the RHIC science mission...
Neutron stars and explosive astrophysical systems - such as supernovae
or compact star binary mergers - represent natural laboratories where
extreme states of baryonic matter are populated. Modeling such
environments assumes, among others, good understanding of zero and
finite temperature equations of state (EoS). In this talk I shall first
discuss the relation between nuclear matter...
I discuss neutron star matter from the picture of quark-hadron continuity. Recent neutron observations indicate that 2.1- and 1.4-solar mass neutron stars have similar radii, disfavoring the presence of strong first order phase transitions in the domain between ~2n0 and ~5n0 with n0 being nuclear saturation density. Meanwhile ~5n0 is the density where baryons are expected to overlap and...
I will summarize some of the recent results in meson spectroscopy in the light and heavy sectors, in particular for exotic candidates.
Elastic lepton-nucleon scattering is arguably the simplest measurable process sensitive to the nucleon's internal structure and dynamics. The spacelike and timelike electromagnetic form factors of the nucleon have been measured with ever increasing precision over a wide range of energies since the 1950's, and these measurements have led to many surprises and discoveries that changed our basic...
The NA62 experiment at CERN collected world's largest dataset of charged kaon decays in 2016-2018, leading to the first observation of the ultra-rare K+ --> pi+ nu nu decay based on 20 candidates. Dedicated trigger lines were employed for collection of di-lepton final states, which allowed establishing stringent upper limits on the rates lepton flavor and lepton number violating kaon decays....
Stunning discoveries of the hadronic states,
$P_{\psi}$, $P_{\psi s}$, $T_{\psi}$, $T_{\psi s}$, and $T_{\psi\psi}$, that are manifestly different to the conventional meson and baryons, have energized the field of spectroscopy in recent years. New exotic states keep appearing thanks to the excellent detector performance of the LHCb experiment and scrupulous data analysis. In this talk,...
We will discuss the reach for light new physics in rare kaon and hyperon decays.
The JLab 12-GeV electron beam provides an opportunity to advance Q2 for all four electro-magnetic form-factors. Currently the results for GMp up to 15 GeV2 are published, and the data for GMn up to 13.5 GeV2 are collected. The Hall B GMn experiment also collected new data. In 2022-23 the GEn experiment will collect data for Q2 up 9.9 GeV2 and after that the data for GEp will be obtained up to...
Short-Range Correlations (SRCs) between nucleons appear to a ubiquitous feature of the structure of nuclei. While correlated nucleons are a minority (estimated to be approximately 20% of nucleons in all but light nuclei), they can have an outsized influence on a number of relevant nuclear properties such as the symmetry energy in the nuclear matter equation of state, matrix elements in double...
In this talk I summarize advances on calculations of hadron spectrum and structure observables using functional methods such as Dyson-Schwinger and Bethe-Salpeter equations. Systematic improvements in this approach have made it possible to address a wide range of problems from the baryon excitation spectrum to multiquark spectroscopy, form factors, parton distributions and other areas. I will...
Neutrino oscillation experiments rely on observing neutrino-nucleus interactions to obtain the energy spectrum which is key to study this phenomenon. The challenge in obtaining the required precision lies in controlling the systematic uncertainties in the energy measurement of the neutrinos. A significant fraction of these uncertainties comes from the unknowns of neutrino scattering. A better...
The Belle II experiment at the SuperKEKB energy-asymmetric electron-positron collider is a major upgrade of the B factory experiment at KEK in Tsukuba, Japan. With a goal of collecting 50 times the data recorded by its predecessor, Belle II has an expansive program in hadronic spectroscopy. Many early measurements have proven the capabilities of the detector. In this talk, I will review some...
We are entering an era of high-precision neutrino oscillation experiments (T2HK, DUNE), which potentially hold answers to some of the most exciting questions in particle physics. Their scientific program requires a precise knowledge of neutrino-nucleus interactions coming from fundamental nuclear studies. These theoretical calculations should be firstly benchmarked with electron scattering...
Recent measurement of coherent π0 photoproduction on Pb lead to a most accurate determination of the neutron skin, constraining nuclear matter Equation of State (EoS) at around ρ~1ρ0. A natural next step is elucidating the nuclear EoS at higher densities to tune our understanding of the most violent process in the Universe - neutron stars mergers. It was demonstrated that at densities above...
A theoretical analysis of the $C\!$-conserving semileptonic decays $\eta^{(\prime)}\to \pi^0 l^+ l^-$ and $\eta^{\prime}\to \eta l^+ l^-$ ($l=e$ or $\mu$) is carried out within the framework of the Vector Meson Dominance (VMD) model. A phenomenological model is used to parametrise the VMD coupling constants and the associated numerical values are obtained from an optimisation fit to $V\to...
In this talk we will discuss our recent works (2201.08253 and 2207.08563) in which we make analyses of several X and Z states. In the first part of the talk, we present a combined study of the BESIII spectra in which the Zc(3900) and Zcs(3985) states are seen, assuming that both are SU(3) partners. In the second part, a step further is taken and we analyze the...
Time-like hadron electromagnetic form factors are accessible through electron-positron annihilation into a hadron and anti-hadron pair and its time reverse reaction. Large progress was recently done at electron-positron colliders, applying the Initial State Radiation (ISR) method. Precise measurements of the proton form factor, up to s $simeq$ 40 GeV$2$, done by BaBar showed irregularities in...
The $X_0(2900)$ was observed by the LHCb and has been largely accepted as a $D^* \bar K^*$ molecule. Yet, the molecular picture gives rise to three spin states, with $J^P=0^+,1^+,2^+$, and only the $0^+$ state has been so far observed.
We present three methods to determine these extra states.
1) The $\bar B^0 \to D^{∗+} ̄\bar D^{*0} K^−$, looking at the $D^{*+} K^-$ spectrum.
2) The...
Exploring the electromagnetic form factors of baryons helps us understand their internal structure and how the strong force binds the quarks together. The form factors of nucleons have been and continue to be studied extensively, but it is valuable to also pursue other, parallel avenues of research. A complementary and relatively unexplored approach is the study of hyperons. What does the...
The gravitational-wave observatories of LIGO and Virgo have opened a new field of astronomy. The first and nearest signal from merging neutron stars, GW170817, guided astronomical partners' observations, constrained the source system's properties, and gave a new viewpoint on the equation of state of dense matter in neutron stars. More distant sources primarily tell us about the source masses,...
Hadronic molecules are composite systems of hadrons. Many hadron resonances observed in the last two decades are good candidates of hadronic molecules, including the X(3872), the hidden-charm Pc pentaquarks, the double-charm Tcc, etc. I will discuss the physics of hadronic molecules with a focus on the hidden-charm and double-charm ones.
Based on the 4.48x10^6\psi(3686) events, we will report on searches for the decay \psi(3686) and chi_cJ ->Lambda anti-Lambda, chi_cJ-> nK_S Lambda +c.c., and isospin violation decay \psi(3686) -> Lambda anti-Lambda pi0. Using data events of integrated luminosity 3.18/fb taken at sqrt s= 4.18 GeV, the decay e^+e^- -> pK anti-Lambda bar +c.c. is analyzed with partial wave analysis. The...
The LHCb collaboration recently discovered a doubly charmed tetraquark $T_{cc}$ with flavor $cc\bar u\bar d$ just below $DD^*$ threshold. This is the longest lived hadron with explicitly exotic quark content known to this date. We present the first lattice QCD study of $DD^*$ scattering in this channel, involving rigorous determination of pole singularities in the related scattering...
In the relativistic mean-field Quark-Meson-Coupling (QMC) model, the baryon-baryon interaction in medium is interpreted in terms of a virtual meson exchange between light valence quarks in individual baryons [1]. This unique feature leads to a dramatic reduction of variable parameters of the model as compared to traditional nuclear structure models, and to a versatile application to high...
Radiative transition of an excited baryon to a nucleon with emission of a virtual massive photon converting to dielectron pair (Dalitz decays) provides important information about baryon-photon coupling at low q2 in timelike region. These measurements are complementary to time like e+e- annihilation experiments at larger q2 value and meson production with electron and photon beams covering...
A detailed study of the nucleon resonances and their decays is an essential step towards exploring the low energy region of QCD. By analysing the excitation spectrum of (quasi-) free nucleons we are able to establish a baseline for comparisons with in-medium modifications. Of particular interest are the mixed-charged channels of double-pion photoproduction, as they are sensitive to sequential...
We consider the chiral Lagrangian with nucleon, isobar, and pion degrees of freedom. The baryon masses and the axial-vector form factor of the nucleon are derived at the one-loop level. We explore the impact of using on-shell baryon masses in the loop expressions. As compared to results from conventional chiral perturbation theory we find significant differences. An application to QCD lattice...
Our understanding of the physics of baryonic systems containing strangeness is limited by the scarcity of experimental data. Aiming at alleviating this deficit is lattice QCD, a numerical approach to solve the complex dynamics of strongly interacting systems of hadrons and nuclei. In this talk I will present the results obtained by the NPLQCD collaboration for two octet-baryon systems, with...
Phenomenological amplitudes obtained in partial-wave analyses of single-pion photoproduction are used to evaluate the contribution of this process to the Gerasimov--Drell--Hearn (GDH), Baldin, and Gell-Mann--Goldberger--Thirring (GGT) sum rules, by integrating up to 2 GeV in photon energy. Our study confirms that the single-pion contribution to all these sum rules converges even before the...
We construct posterior distributions of equations of state (EoS),
relevant to the studies of neutron stars (NSs), by applying Bayesian
approach to two different models. The EoSs are subjected to minimal
constraints which correspond to a few basic properties of nuclear
matter at the saturation density and the low density pure neutron
matter EoS obtained from a precise...
Understanding the dynamics of hadrons with different quark content is crucial to solve fundamental aspects of QCD as well as for the implications on the structure of dense stellar objects, such as neutron stars. The scarce statistics and lack of data in reactions for unstable hadrons, containing in particular strange and charm quarks, affect the accuracy of the current theoretical description...
The spin content of the proton as a function of quark and gluon helicities and orbital angular momentum can be described in terms of integrals of parton distributions. These integrals, from x=0 to 1, require in particular a precise understanding of the asymptotic behavior of said distributions in the low x limit. We will discuss the resummation of double logarithms which governs this behavior...
We have performed calculations for the states $\Omega_{cc}$, $\Omega_{bc}$ and $\Omega_{bb}$ stemming from coupled channel interactions between the pseudoscalar or vector mesons and the $1/2^+$, $3/2^+$ baryons. In all cases, we find bound states or resonances, using the Bethe-Salpeter equation to unitarize the interaction of the coupled channels with the input for the potential obtained from...
In this article, we study simple hadron scattering models provided by the PYTHIA8 Monte Carlo event generator, intended to consider the overlap of multiple strings at low transverse dimensions. Firstly, we studied a so-called new model for generating the transverse momentum of hadrons during the string fragmentation process. Secondly, close packing of strings is taken into account by making...
In this talk we present our BK solution to next-to-leading order approach (NLO) and compare with the experimental HERA data. This approach includes the re-summed NLO corrections to the kernel of the evolution equation, the impact
parameter dependence of the saturation scale in accord with the Froissarrt theorem as well as the non-linear corrections. We successfully describe the...
The Electron-Ion Collider (EIC), a powerful new facility to be built in the United States at the U.S. Department of Energy’s Brookhaven National Laboratory in collaboration with Thomas Jefferson National Accelerator Facility, will explore the most fundamental building blocks of nearly all visible matter. The EIC will address some of the most profound questions concerning the emergence of...
The accelerator facility for Antiproton and Ion Research FAIR, one of the largest research infrastructures in Europe, is currently being built adjacent to the campus of GSI, Helmholtzzentrum für Schwerionenforschung, in Darmstadt. A suit of accelerators and storage rings will offer excellent research opportunities in hadron and nuclear physics, in atomic physics and nuclear astrophysics as...
The ability of current and next generation accelerator based neutrino oscillation measurements to reach their desired sensitivity and provide new insight into the nature of our Universe, requires a high-level of understanding of the neutrino-nucleus interactions. These include precise estimation of the relevant cross sections and the reconstruction of the incident neutrino energy from the...
I give an overview of (some of) the different analysis tools and PWA approaches used to extract the spectrum of nucleon and Delta states from experimental data. Differences and similarities, e.g. in the construction of the amplitude or the data base, will be illustrated.
In addition, I will discuss the current status of the hyperon resonance spectrum.
Jefferson Lab is considering extending the fruitful physics program carried out at 6GeV and 12 GeV electron beam with new infrastructure. A unique positron beam of high intensity and high polarization up to 12 GeV energy will open new opportunities in exclusive reaction channels (DVCS) and precision (two-photon exchange) and BSM physics (Dark Matter searches). Existing detectors upgrade to...
The Muon g-2 Experiment at Fermi National Accelerator Laboratory was designed to measure the anomalous magnetic moment of the muon, a, with a target precision of 140 parts-per-billion; a four-fold improvement over the former measurement from the early 2000s at Brookhaven National Laboratory. The experiment was motivated by the ~3.5 standard deviation between the BNL result and the Standard...
An overview of the phenomenological aspects of generalized
parton distributions will be given, including recent results and fits
to available experimental data.
A beam of neutral kaons at the GlueX experiment will provide exciting physics opportunities for baryon and meson spectroscopy. With a flux exceeding previous experiments by up to three orders of magnitude, the approved K-Long facility at Jefferson Lab will allow us to substantially improve our knowledge of the properties of strangeness $S=-1$ hyperons by providing input for partial-wave...
We present the properties of open heavy mesons in hot mesonic matter based on a self-consistent theoretical approach that takes into account chiral and heavy-quark spin-flavor symmetries. The heavy-light meson-meson unitarized scattering amplitudes in coupled channels incorporate thermal corrections as well as the dressing of the heavy mesons with the self-energies [1, 2]. As a result, the...
The Generalized Polarizabilities (GPs) are fundamental properties of the nucleon. They characterize the nucleon's response to an applied electromagnetic field, giving access to the polarization densities inside the nucleon. As such, they represent a central path towards a complete understanding of the nucleon dynamics. Previous measurements have challenged the theoretical predictions, raising...
The sPHENIX detector at RHIC is currently under construction and is on schedule for first data in early 2023. At mid-rapidity it consists of a silicon pixel vertexer, a silicon strip detector with single event timing resolution and a compact TPC; as well as an EM calorimeter and a 1.4T BaBar superconducting solenoid sandwiched by an inner and outer hadronic calorimeter.
sPHENIX will allow...
The system of light pseudoscalar meson π0, η and η' provide a unique laboratory to probe fundamental QCD symmetries at the confinement scale. While π0 and η are Goldstone bosons due to spontaneous chiral symmetry breaking, η' is not due to an axial U(1) anomaly. There is a second type of chiral anomaly driving the two-photon decays of these mesons. This system harbors information about the...
sPHENIX is a new collider detector at the Relativistic Heavy Ion Collider, with a commissioning and first data-taking run taking place in Spring 2023. The experiment is purpose-built for state-of-the-art jet and heavy flavor probes of the Quark-Gluon Plasma, with qualitatively new capabilities not previously available at RHIC. This talk will give an overview of the sPHENIX physics program and...
Generalized Parton Distributions (GPDs) describe the correlations between the longitudinal momentum and the transverse position of the partons inside the nucleon. They are nowadays the subject of an intense effort of research, in the perspective of understanding nucleon spin and mechanical properties.
In this talk, we present the first observation of the Timelike Compton Scattering (TCS)...
Over the past two decades, a large number of exotic states has been discovered at various accelerator facilities. Many of these states are located close to certain hadron-hadron thresholds and therefore can be considered as potential candidates for hadronic molecules. In this talk, we will review the classical Weinberg formalism that was developed to assess whether the deuteron is composite or...
The world’s largest sample of J/ψ events accumulated at the BESIII detector offers a unique opportunity to investigate η and η′ physics via two body J/ψ radiative or hadronic decays. In recent years the BESIII experiment has made significant progresses in η/η′ decays. A selection of recent highlights in light meson spectroscopy at BESIII are reviewed in this report, including the observation...
The electromagnetic scalar polarizabilities ($\alpha$,$\beta$) are fundamental structure constants of the nucleon, and precise experimental measurements of these are vital for a complete understanding of the nucleon’s internal structure. The scalar polarizabilities can be accessed via Compton scattering reactions on light nuclei targets like $^1$H, $^2$H, and $^3$He. Such cross section...
We evaluate theoretically the interaction of the open bottom and strange systems $\bar B\bar K$, $\bar B^* \bar K$, $\bar B\bar K^*$ and $\bar B^*\bar K^*$ to look for possible bound states which could correspond to exotic non--quark-antiquark mesons since they would contain at least one $b$ and one $s$ quarks. The s-wave scattering matrix is evaluated implementing unitarity by means of the...
The STAR Collaboration has successfully completed an upgrade consisting of forward detector systems located between 2.5 < η < 4.0. This upgrade comprises a Forward Calorimeter System, containing an Electromagnetic Calorimeter and a Hadronic Calorimeter, and a Forward Tracking System, consisting of a Forward Silicon Tracker and Forward small-strip Thin Gap Chambers. The forward detector upgrade...
Searching QCD critical point is one of the fundamental goals of heavy-ion collisions. The observed non-monotonic behavior with the colliding energies[1,2] was declared to be related to the critical point of the QCD phase diagram[3,4].
To reveal the critical fluctuations effects on the light-nuclei productions, one should address the problem of scale separation and magnitude separation...
With almost 8 fb−1, the KLOE and KLOE-2 data sample represents a
unique, physics-rich sample and the largest dataset ever sized at an electron-
positron collider operating at the φ peak resonance. It represents a collection
of about 24 billion of φ mesons, whose decays include about 8 billion pairs
of neutral K mesons and about 300 million η mesons. With this sample, the
KLOE-2...
We perform a calculation of the interaction of the $ D \bar{D} $, $ D_{s} \bar{D}_{s} $ coupled channels and find two bound states, one coupling to $ D \bar{D} $ and another one at higher energies coupling mostly to $D_{s}^{+} D_{s}^{-}$. We identify this latter state with the $X_{0}(3930)$ seen in the $D^{+} D^{-}$ mass distribution in the $B^+ \to D^{+} D^{-} K^{+} $ decay, and also show...
The phase structure of baryonic matter is investigated with focus on the role of fluctuations beyond the mean-field approximation. The prototype test case studied is the chiral nucleon-meson model, with added comments on the chiral quark-meson model. Applications to nuclear matter include the liquid-gas phase transition. Extensions to high baryon densities are performed for both nuclear and...
SPD is an international experiment primarily focused on study of the
spin-dependent gluon structure of proton and deuteron in $pp$, $pd$, and $dd$
collisions. The experiment will operate on polarized beams of the NICA
facility at Joint Institute for Nuclear Research. The accelerator
complex can provide beams with the center-of-mass energy $\sqrt{s_{NN}}$
up to 27 GeV for $pp$ collisions,...
The exact eigenenergies of the T4c, T4b, T2bc tetraquarks are calculated within the extended transitional Hamiltonian approach. The IBM, as proposed by Arima and Iachello [1], includes two types of bosons with angular momentum L = 0 (s bosons) and L = 2 (d bosons). To investigate the properties of tetraquarks, similar to that of the two-level system, a four-level system is considered here. To...
The PHENIX experiment collected data from a variety of collision species and energies at the Relativistic Heavy Ion Collider (RHIC) through 2016. Analyses of the large amounts of data collected continue to yield intriguing results that further our understanding of QCD from understanding properties of the proton to the hot dense phase of nuclear matter produced in heavy ion collisions known as...
Thomas Jefferson National Accelerator Facility (JLab) in Virginia, USA, is home to several experiments studying strange baryons using electro- and photoproduction on a range of different targets. In this presentation we will review recent results with a focus on the CLAS(12) and GlueX experiments. We will also give a short outlook towards future measurements performed with a KLong beam.
Electromagnetic polarizabilities are fundamental properties of composite systems such as molecules, atoms, nuclei and hadrons. Polarizabilities measure the 'stiffness' of a system to electromagnetic deformation. Measurements of hadron polarizabilities provide a test of effective field theories, dispersion theories, and lattice calculations. While significant progress has been made in...
Understanding how nuclei behave at the extremes of neutron and proton number is critical to developing a predictive theory of nuclei and how they interact. This knowledge, in turn, allows us to elucidate the chemical history of the universe, use nuclei as laboratories to test fundamental symmetries, and develop tools and related technologies that can benefit society. The US Department of...
Both muon and hadron beams with a energy up to few hundred GeV are available at the M2 beamline of the CERN/SPS. AMBER (Apparatus for Meson and Baryon Experimental Research) is a new fixed-target experiment started in 2021. An ambitious experimental program of AMBER address the various aspects of the so-called Emergence of Hadron Mass mechanism: the charge radii of various hadrons, parton...
With the large datasets on 𝑒+𝑒−annihilation at the 𝐽/𝜓 and 𝜓(3686) resonances collected at the BESIII experiment, multi-dimensional analyses making use of polarization and entanglement can shed new light on the production and decay properties hyperon-antihyperon pairs. In a series of recent studies performed at BESIII, significant transverse polarization of the (anti)hyperons has been observed...
Understanding the high energy limit of Quantum Chromodynamics (QCD) is one of the outstanding goals in nuclear and particle physics. At very high energies, it is conjectured that hadrons and nuclei transform into a universal form of matter known as the Color Glass Condensate (CGC). The CGC is an effective field theory for high-density saturated small-x gluons. This framework has been...
Among the light baryons, the $J^\pi = \frac{1}{2}^-$ $\Lambda(1405)$ baryon is an important special case by sitting just below the $\bar{K}N$ threshold and decaying almost exclusively to $\Sigma\pi$. It has long been hypothesized to be either a molecular bound state or a continuum resonance, or that it is a simple quark-model resonance, the $P$-wave companion of the $\Lambda(1520)$. In...
Deconfined quarks and gluons are expected to be created in the relativistic heavy-ion collision. According to the coalescence model, yields of exotic hadrons are expected to be strongly affected by their structures [1]. Searching for exotic state particles and studying their properties can extend our understanding of quantum chromodynamics (QCD). The $f_{0}$(980) resonance is an exotic state...
The future Electron-Ion Collider (EIC) in the US – with experimental operations starting in the early 2030s – is poised to be the machine in high-energy nuclear physics to answer longstanding question in hadronic physics. It will be capable of operating at luminosities up to $10^{34}$ cm$^{-2}$s$^{-1}$, and be the only machine able to collide polarized electron and polarized light / nuclear...
Electrons are much cleaner probes of nucleon structures than hadron beams. At the same time the electron scattering at large momentum transfer can be a source of considerable photon radiation, which can significantly distort the inferred nucleon structure if it is not properly accounted for. We present a factorized approach to semi-inclusive deep inelastic scattering, which treats QED and QCD...
One of the main goals of ultra-relativistic nuclear collisions is to create a new state of matter called quark-gluon plasma (QGP) and study its properties. Anisotropic flow $v_n$, defined as the correlation of the azimuthal angle of each particle with respect to a common symmetry plane $\Psi_n$, is an ideal probe of QGP's properties. The $v_n$ and $\Psi_n$ represent the magnitude and the phase...
Pion parton distribution functions (PDFs) have a long standing debate in QCD regarding the behavior of the valence quark PDF as the momentum fraction, $x$, approaches 1. Recently the Jefferson Lab Angular Momentum (JAM) collaboration has included both the historical fixed-target Drell-Yan (DY) data and the leading neutron (LN) electroproduction data from HERA in a simultaneous global QCD...
The Jefferson Lab Eta Factory (JEF) experiment is an upcoming experiment designed to run in Hall D at Jefferson Lab using an upgraded GlueX spectrometer to study various decays of the $\eta$ meson. The GlueX spectrometer consists of a $\sim$2 Tesla solenoid magnet housing a liquid hydrogen target and drift chambers used for tracking charged particles and an array of lead glass blocks (the...
The quark-gluon plasma (QGP) is a deconfined state of nuclear matter made of free quarks and gluons, created under high temperature or energy density. Charmonia, bound states of charm and anti-charm quarks, are very special probes of the deconfined medium. $J/\psi$, the vector meson ground state of the charmonium family is abundantly produced at the LHC energies but its production mechanism is...
Quantum Chromo Dynamics (QCD) is our current best description of interactions between quarks and gluons and it not only predicts the existence of the well understood mesons (two-quark) and baryons (three-quark) it also predicts exotic Tetra, Penta and Hexaquark states.
Experiments taking place at Thomas Jefferson Lab in Virginia, USA using the upgraded CLAS12 detector system allows a detailed...
We reinterpret jet clustering as an axis-finding procedure which, along with the proton beam, defines the virtual-photon transverse momentum $q_T$ in deep inelastic scattering (DIS). In this way, we are able to probe the nucleon intrinsic structure using jet axes in a fully inclusive manner, similar to the Drell-Yan process. We present the complete list of azimuthal asymmetries and the...
In the present work, we have explored the higher twist T-even TMD $h_3$ in the light-front quark-diquark model. Within the same model, we have studied their relations with the leading twist TMDs and also calculated its average transverse momentum.
Strangeness Nuclear Physics is a broad field of research that studies hadron processes and nuclear systems containing strangeness, from single- to multi-strangeness systems, and from few-body systems to neutron stars. This talk presents an overview of the progress made in strangeness nuclear physics and related fields over the last few years. It will be seen that, despite the difficult times...
The High Acceptance Di-Electron Spectrometer (HADES) [1] installed at GSI is a versatile detector, which was originally designed to study medium effects in e+e− production in heavy-ion reactions in the SIS-18 energy range (1-2 GeV/nucleon). Its excellent particle identification capabilities allowed for a systematic investigation of dielectron, strange particles and pion production in proton,...
I will give a brief overview of the state of the art of TMD factorization and of 3D nucleon structure phenomenology, focusing on a personal selection of hot topics. I will then highlight some of the future perspectives in this field.
During two data taking compains in 2011-18 LHCb experiment has collected large samples of beauty and charm hadrons produced in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. These samples are used to study properties and decays of conventional mesons. In this contribution a summary of the LHCb experimental results released in 2022 is presented.
The measurement of the production, the lifetime and the binding energy of the hypertriton with the ALICE detector at the LHC is presented to address some of the key open questions of hypernuclear and particle physics.
The hypertriton is a bound state of a proton (p), a neutron (n) and a Λ and it is characterized by a very low binding energy and a large wave function. It is still unclear how...
Near-threshold charmonium photoproduction opens the door for studying the gluonic properties of the proton: gluonic GPDs, anomalous contribution to the mass of the proton, gravitational form factors, and the mass radius of the proton. However, such an ambitious program requires precise measurements to validate the theoretical assumptions that relate the experimental results to the above...
The identification of X(3872) requires a comparison of its properties with those expected for ordinary $c{\bar c}$ states, in particular for $\chi_{c1}^\prime$ which is the candidate ordinary state for the X(3872) identification. I will discuss predictions for observables involving $\chi_{c1}^\prime$ and work out relations with other observables involving ordinary charmonia.
When center-of-mass energy in heavy-ion collisions decreases down $\sqrt{s_\mathrm{NN}}$ of a few GeV, colliding nuclei are not transparent anymore to each other. This leads to increasingly strong baryon stopping in the collision zone, and the formation of baryon-rich matter, where effects due to resonance excitation play an essential role. The goal is to understand the properties of such a...
The vast majority of hadrons are not stable with respect to the strong interactions, and are seen as resonant enhancements in the scattering of the lightest stable hadrons. Recent developments have enabled the determination of hadron resonance properties from scattering amplitudes determined from lattice QCD. A summary of the approach will be given, and examples will be presented for...
The hyperon-nucleon (Y-N) interaction is an important ingredient in the description of the equation-of-state of high-baryon-density matter. Light hypernuclei ($A=3, 4$), being simple Y-N bound states, are cornerstones of our understanding of the Y-N interaction. Precise measurements of the lifetimes and binding energies of light hypernuclei are of particular interest.
Light hypernuclei are...
We consider the experimental data on yields of protons, strange Λ’s, and multistrange baryons (Ξ, Ω), and antibaryons production on nuclear targets, and the experimental ratios of multistrange to strange antibaryon production, at the energy region from SPS up to LHC, and compare them to the results of the Quark-Gluon String Model calculations. In the case of heavy nucleus collisions, the...
$J/\psi$ photo-production near threshold provides a unique window into the non-perturbative structure of the gluonic fields of the nucleon, enabling access to information regarding the origin of its mass and mass radius. In the Jefferson Lab E12-16-007 experiment, we measured the two-dimensional $J/\psi$ photo-production cross-section as a function of photon energy $E_{\gamma}$ and momentum...
The NA61/SHINE experiment aims to discover the critical point of strongly interacting matter and study the properties of the onset of deconfinement. For this purpose, we perform a two-dimensional scan of the phase diagram by varying the collisions' energy and system size.
The NA61/SHINE results from a strong interaction measurement program will be presented in this presentation. In...
The conventional picture of the proton is based on three “valence” quarks—two “up” and one “down”. This picture has done a remarkable job of describing many properties of the proton. However, thanks to the richness of QCD, the proton is a much more complicated object. In addition to the valence quarks, the proton contains a “sea” of quark-antiquark pairs and gluons that bind the system...
Accessing the hadron spectrum from Quantum ChromoDynamics (QCD) poses several challenges given its non-perturbative nature and the fact that most states couple to multi-particle decay modes. Although challenging, advances in both theoretical and numerical techniques have allowed us to determine few-body systems directly from QCD. A synergistic approach between lattice QCD and scattering theory...
We report on our recent leading order pionless effective field theory (LO pionless EFT) studies [1,2,3,4,5] of light single- and double-Lambda hypernuclei. These systems are within the focus of current experimental interest since their spectra provide strong constraints in a study of the 2- and 3-body interaction between $\Lambda$ hyperons and nucleons. Application of LO pionless EFT, fitted...
We investigate the two-photon transitions of the charmonium system in relativistic dynamics on the light front. The light-front wave functions were obtained from solving the effective Hamiltonian based on light-front holography and one-gluon exchange interaction within the basis light-front quantization approach. We compute the two-photon transition form factors as well as the two-photon decay...
The pion-nucleus reaction is an important source of information about hadronic matter. At incident momenta below 2 GeV/c, it gives access in a very unique way to the properties of baryonic resonances in the nuclear medium. While the region of the Δ(1232) resonance, corresponding to incident pion beam momenta of about 300 MeV/c, was studied in detail in the past, only very scarce measurements...
We investigate the cos2𝜙𝑡 azimuthal asymmetry in 𝑒 𝑝→𝑒 𝐽/𝜓 𝐽𝑒𝑡 𝑋, where 𝐽/𝜓-jet
pair is almost back-to-back in the transverse plane, within the framework of the
generalized parton model(GPM). We use non-relativistic QCD(NRQCD) to calculate
the 𝐽/𝜓 production amplitude and incorporate both color singlet(CS) and color
octet(CO) contributions to the asymmetry. We estimate the asymmetry...
Direct ΛN scattering data is extremely important and needed based on the newly confirmed Charge-Symmetry-Breaking (CSB) at a level of ~230 keV from the binding energy difference observed between ground states of $^4_Λ$He and $^4_Λ$H. Especially, the Λn data does not exist at all, thus the properties of Λn interaction has been assumed to be identical to that of Λp interaction. The resonance of...
The explicit sea quark distribution functions of proton have been calculated in the
chiral constituent quark model which has implications of chiral symmetry breaking and SU(3) symmetry breaking. The results have been discussed in detail for the sea quark asymmetries and the Gottfried integral in light of the latest SeaQuest data.
We perform a theoretical study of the $D_s^{+}\to \pi^{+}\pi^{+}\pi^{-}\eta$ decay. We look first at the basic $D_s^{+}$ decay at the quark level from external and internal emission. Then hadronize a pair or two pairs of $q\bar{q}$ states to have mesons at the end. Posteriorly the pairs of mesons are allowed to undergo final state interaction, by means of which the $a_0(980)$, $f_0(980)$,...
Production of strange quarks in relativistic heavy-ion collisions is not only used as a signature of QGP formation but also as a diagnostic tool. Strange quarks and antiquarks are produced via strong interactions in the QGP medium and are not present in ordinary matter. The reason is that they promptly undergo decay via weak interactions as soon as they are produced. Additionally, the mass of...
In present work we study the production of ground and excited charmonium states in $e^- e^+ \rightarrow \gamma+ \eta_c(nS)/\chi_{cJ}(nP)(J=0,1)$ [1] through leading order (LO) (tree-level) diagrams, which proceed through exchange of a virtual photon that couples to $\gamma$ and $\eta_c/\chi_{cJ}$ through the triangular quark loop diagram, in the framework of $4\times 4$ Bethe-Salpeter equation...
We study the $\Omega(2012)$ which was measured in the Belle experiment. We conduct a study of the interaction of the $\bar K \Xi^*$, $\eta \Omega$($s$-wave) and $\bar K \Xi$($d$-wave) channels within a coupled channel unitary approach. We also present a mechanism for $\Omega_c \to \pi^+ \Omega(2012)$ production through an external emission Cabibbo favored weak decay mode, where the...
I discuss the scope and naturalness of the proton mass decomposition (or sum rule) published in PRL74, 1071 (1995), focusing particularly on its interpretation and the quantum anomalous energy contribution. I stress the importance of measuring the quantum anomalous energy through experiments. I will also discuss the mass radius and relation to the threshold J/psi production on the proton.
We investigate 𝑆=−1 and −2 hypernuclei with 𝐴=4−7 employing the Jacobi-NCSM approach [1] and in combination with baryon-baryon (BB) interactions derived within the frame work of chiral effective field theory. The employed BB interactions are softened using the so-called similarity renormalization group (SRG) [2] in order to speed up the convergence. Such a SRG evolution is only approximately...
Classification of tetraquarks states using SU(6) spin-flavor symmetry alongwith SU(3) and SU(2)is done by using Young tableau method. We also have predicted the tetraquark masses and their decay widths by using the extension of Gursey- Radicati mass formula and our results are in very close agreement with the available experimental and theoretical data.
Finding the experimental signatures of the local $CP$ violation in the strong interaction is one of the major interests in high-energy physics. Chiral Magnetic Effect (CME) is predicted to occur in the heavy-ion collisions. Although some non-zero results of CME sensitive observables have been obtained at both RHIC and LHC energies in the past decades, search for conclusive evidence of CME is...
In this talk, I will give a broad overview of the production and detection of dark matter in high-intensity experiments. The dark matter and dark sector candidates include dark scalar, dark photon, millicharged particles, dark neutrino, and dipole-portal heavy neutral leptons in existing and future experiments like MiniBooNE, MicroBooNE, DUNE, SBN, NA62, and SHiP. I also discuss similar...
The proton charge radius is one of the important quantities in physics. For the past seventy years it has been measured through elastic electron-proton scattering and ordinary hydrogen spectroscopy methods. Over the years, results from both methods generally agreed with each other within their experimental uncertainties. Unexpectedly, in 2010 (and 2013) two experiments from newly developed...
Heavy quarkonium production of high transverse momentum ($p_T$) in hadronic collisions can be pursued in the QCD factorization formalism with heavy quarkonium fragmentation functions (FFs), which carry rich information on how a physically observed quarkonium was emerged from quarks and gluons produced in high energy scattering. The scale evolution of quarkonium FFs enables us to resum...
The Positronium system, a bound state of an electron and a positron, is
suitable for testing the predictions of quantum electrodynamics (QED), since its
properties can be perturbatively calculated to high accuracy and is not affected
by finite size or QCD effects at the current experimental precision level. The
Ps triple state, the ortho-Positronium (o-Ps), which mainly decays to...
The MUon Scattering Experiment (MUSE), which takes place at the PiM1 beamline of the Paul Scherrer Institut (PSI), aims to simultaneously measure elastic ep and μp scattering in order to determine the proton charge radius. However with the beamline and kinematics available to the experiment, MUSE has a broader physics reach than extracting the proton radius. As the experiment has access to...
In 2023, the sPHENIX detector at BNL’s Relativistic Heavy Ion Collider (RHIC) will begin measuring a suite of unique jet and heavy flavor observables with unprecedented statistics and kinematic reach at the RHIC energies using combined EM and hadronic calorimeters and high precision tracking.
The experiment incorporates full azimuth vertexing, tracking, and a complete set of electromagnetic...
Heavy quarkonium production is considered as useful tools to study perturbative and nonperturbative aspects of QCD. For this, it is essential to understand the mechanism of quarkonium production from QCD theory, which remains elusive to this day. In this talk, we review the current status of theoretical approaches and recent progresses in our understanding of heavy quarkonium production based...
This talk will discuss upcoming tagged deep inelastic scattering (TDIS) measurements in Hall A of Jefferson Lab, which will probe the elusive mesonic content of the nucleon. The TDIS experiment will measure low momentum recoiling (and spectator) hadrons in coincidence with deep inelastically scattered electrons from hydrogen (and deuterium) targets. The recently installed Hall A Super Bigbite...
We study the evolution of the doubly charmed state $T_{cc}^+$ in a hot hadron gas produced in the late stage of heavy-ion collisions. We use effective Lagrangians to calculate the thermally averaged cross sections of $T_{cc}^+$ production in reactions such as $ D^{(*)} D^{(*)} \rightarrow T_{cc}^+ \pi, T_{cc}^+ \rho $ and its absorption in the corresponding inverse processes. We then...
We investigate the phase structure and thermodynamic properties of
the Polyakov loop-extended chiral quark mean-field model at different val-
ues of temperature and density. We explore the effect of finite volume and
magnetic field on phase transition from confined hadronic state to decon-
fined quarks. A shift of phase boundary to higher values of quark chemical
potential ($μ_q$)...
We present the next-to-leading order (NLO) calculation of associated hadroproduction of $J/\psi$ plus $W$ or $Z$ bosons within the factorization framework of nonrelativistic QCD (NRQCD). We compare to ATLAS data using various sets of nonperturbative long distance matrix elements (LDMEs) as input. Our results thereby open up a new angle in the ongoing quest to understand whether the LDMEs are...
We explore the sensitivity of the parity-violating electron scattering (PVES) asymmetry in both elastic and deep-inelastic scattering to the properties of a dark photon. Given advances in experimental capabilities in recent years, there are interesting regions of parameter space where PVES offers the chance to discover
new physics in the near future. There are also cases where the existence...
I’ll discuss the role of the triangle anomaly in polarized deep inelastic scattering (DIS) employing a worldline formalism, which is a powerful framework for the computation of perturbative multi-leg Feynman diagrams. I’ll demonstrate that structure function $g_1(x_B,Q^2)$ measured in polarized DIS is dominated by the triangle anomaly in both Bjorken ($Q^2\rightarrow \infty)$ and Regge...
The midrapidity transverse momentum (pt) distributions of the charged pions and kaons, protons and antiprotons, measured by ALICE Collaboration at nine centrality groups of Xe+Xe collisions at (snn)1/2=5.44 TeV, have been described quite well using simultaneous (combined) minimum χ2 fits with the simple (non-consistent) as well as thermodynamically consistent Tsallis function with included...
A brief overview of the experimental evidence for the non-zero intrinsic charm (IC) contribution to the proton PDF is presented.
The effect of intrinsic heavy quarks in the production of prompt photons or $Z$ bosons accompanied by c and b jets in pp collisions
at the LHC is investigated. Our estimations of constraints on the intrinsic charm content of the proton from LHC data on the...
We present the construction of a simple-functional form light-front wavefunctions (LFWFs) of charmonium and bottomonium states on a small-sized basis function representation. In this work, we modeled the LFWFs for four charmonium states and three bottomonium states, $\eta_c$, $J/\psi$, $\psi'$, and $\psi(3770)$, $\eta_b$, $\Upsilon$, $\Upsilon(2s)$, as superpositions of orthonormal basis...
The main motivation is to understand anisotropic flow in deformed collision systems. Here, we will discuss elliptic flow and other higher order flow coefficients (n$\le$4). These coefficients carry essential information about the dynamics of the created medium. The study of anisotropic flow coefficients v n in Xe-Xe collisions at 5.44 TeV under Monte Carlo HYDJET++ model (HYDrodynamics plus...
In this talk we present our results on production of heavy quarkonia pairs in the kinematics of future electron-proton colliders, like EIC, LHeC and FCC-he, and in ultraperipheral collisions at LHC. We analyzed in detail the mechanism which gives the dominant contribution in the leading order in strong coupling $\alpha_s$, both for the hidden-flavour quarkonia pairs and for the double heavy...
Generation of mass within the Standard Model is typically attributed to the Higgs boson. Yet, alone, the Higgs can only explain a few percent of the proton mass. The remainder must be produced by another source. The answer lies in nonlinear, nonperturbative phenomena within the gauge sector of quantum chromodynamics; in fact, at the most fundamental level, in the emergence of a mass-scale...
The existence of a quasi-bound state of antikaon and nucleus, kaonic nucleus, has been discussed ever since the $\bar{K}N$ interaction in $I=0$ channel was confirmed to be strong attractive. The $\bar{K}NN$ quasi-bound state is the lightest kaonic nucleus which is considered to be $I=1/2$ and $J^\pi = 0^-$. To search for the $I_z=+1/2~\bar{K}NN$ state we conducted the J-PARC E15 experiment...
The PHENIX experiment at RHIC collected data up to 2016, primarily at CM collision energies of 200 and (for polarized pp collisions) 500 GeV/nucleon. PHENIX could measure both heavy quarkonia and open heavy flavor decays in the rapidity range -2.2 < y < + 2.2, using the muon arms and the central arm. Analysis of the very large data set collected still continues. Recently, heavy flavor results...
Scattering experiments involving a hyperon and a proton are the most effective methods for investigating two-body hyperon–nucleon (𝑌𝑁) interactions, as is the case in various intensive studies on 𝑝𝑝 and 𝑛𝑝 scattering, which are aimed at understanding nucleon–nucleon (𝑁𝑁) interactions. Scattering observables, such as differential cross sections and spin observables, are essential experimental...
This presentation will focus on recent advances in understanding the internal structure of baryons and their low-lying excitations. The results are founded on the first-principles approach of Lattice QCD, complemented by Hamiltonian effective field theory (HEFT), a nonperturbative extension of effective field theory incorporating the Luscher formalism.
We'll commence with the low-lying...
Parity-violating electron scattering (PVES) is a relatively clean way to probe the weak mixing angle at intermediate energies. It also can provide information on aspects of nucleon and nuclear structure. In this talk I will review the progression in the sensitivity of PVES measurements and summarize recent results from Jefferson Lab. I will also describe the future MOLLER measurement, which...
In Coulomb gauge QCD, there exists an instantaneous chromo-electric interaction between static quark-antiquark pairs. Studying this interaction is an effective way to probe aspects of quark confinement, as the confining behavior of this ‘Coulomb potential’ is related to the confining behavior of the Wilson potential in non-gauge fixed QCD. A clearer picture of the mechanism of confinement...
Open Heavy Flavor and Quarkonia production in heavy ion collisions at RHIC and LHC.
Heavy flavored mesons produced with high pT in heavy ion collisions collisions, reveal several specific features of the production mechanism:
(i) short time of jet formation by a highly virtual heavy quark;
(ii) enhancement of the fragmentation function at large fractional momenta of the heavy meson;
(iii) extremely short time of color neutralization and formation of the...
The hidden charm pentaquark states Pc(4312), Pc(4440), and Pc(4457) can be well assigned as \barD^(*)Sigma_c molecules, which are related by heavy quark spin symmetry. To further study the pentaquark states in the molecular picture, we have taken the heavy quark diquark symmetry to predict the Xicc Sigmac and barD T_cc molecules. Such kind of molecules belong to new molecule that are not...
Spectroscopy of hypernuclei with strangeness $-2$ is important to extract information on hyperon-nucleon and hyperon-hyperon interactions. In J-PARC, followed by a hybrid-emulsion experiment, a series of counter experiments with a newly constructed high-resolution spectrometer S-2S will be performed in near future. In particular, We propose an experiment (J-PARC E75 experiment) to investigate...
Belle II experiment is the perfect laboratory to search for particles that couple weakly to the Standard Model and have a characteristic decay length of a few centimetres and more. Such long lived and displaced vertex search leads to a unique signal with essentially no background. Using this methodology we show that Belle II experiment can successfully probe parameter spaces of axions, light...
We perform a unitary coupled channel study of the interaction of the $D^{*+} D^0, D^{*0} D^+$ channels and find a state barely bound, very close to isospin $I=0$. The width obtained is small, of the order of $80 \;{\rm keV}$, tied to the width of the $D^*$ states, short of the experimental one,
but which would certainly be bigger upon consideration of the experimental resolution. We perform...
Briefly after the Big Bang, the early universe was in a high temperature and high density environment. In order to recreate this state of matter in the laboratory, mini bangs are created by colliding heavy ions at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory and subsequently at the Large Hadron Collider (LHC) at CERN. In this talk I shall be covering on...
The bound system of an antikaon ($\bar{K}$) and nucleons has been widely discussed based on the strong $\bar{K}N$ attraction in the isospin zero channel (I = 0). The attraction leads the much deeper binding energy of kaonic nuclei compared to that of normal nuclei. The simplest kaonic nuclei system, $\bar{K}NN$, has been one of the most expected states to be observed in the interest energy...
The BESIII experiment has accumulated large datasets at the charmonium resonances J/ψ, ψ(3686) and ψ(3770), as well as at various other center-of-mass energies in the region between 3.8 and 4.95 GeV.
These datasets allow us to study a very huge physics program including light hadrons and their properties, charmonium spectroscopy, the production and decays of open charm mesons, and both well...
A class of infinite-dimensional symmetries known as asymptotic symmetries has recently been established as a universal feature of the scattering problem in generic theories of gauge and gravity. These symmetries imply an infinite number of constraints on scattering amplitudes which are equivalent to soft theorems from quantum field theory. Reciprocally, the pattern of soft radiation...
Electromagnetic Form factors give information on internal dynamics of hadrons. They are
theoretical input to the hadron electromagnetic current in calculation of the structure of
hadrons. Their direct measurement in the spacelike and timelike kinematic regime,
respectively, is made through differential cross sections and polarization observables of
electron scattering and electron-positron...
Spin is a unique probe to unravel the internal structure and QCD dynamics of nucleons. Exploration of the 3D spin structure of the nucleons is based on the complementarity of lepton scattering processes and purely hadronic probes. Some of the main questions that physicists have been trying to address in spin experiments involving different interactions and probes are: How does the spin of the...
Electroweak processes in few-body systems are relevant to nuclear
astrophysics, searches for physics beyond the standard model and
provide additional insight into the nuclear Hamiltonian. Specifically,
effective field theories have opened avenues to provide quantitative
statements for theoretical calculations. Muon capture on the deuteron
is one process that is anticipated to provide...
