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6/17/24, 8:00 AM
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Dr Nicholas Zachariou (University of York)6/17/24, 9:20 AM
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Ulrike Thoma6/17/24, 9:30 AM
One of the open challenges in subnuclear physics is to understand the
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non-perturbative regime of Quantum Chromodynamics, including the world
of the nucleon and its excitations.
A necessary step towards this aim is a precise knowledge
of the experimental spectrum and the properties of baryon resonances.
Recently, large progress has been made especially based on... -
Ralf Gothe (University of South Carolina)6/17/24, 10:00 AM
Why nucleon resonance excitations beyond the photopoint can play a unique role in leading the path towards a comprehensive QCD theory will be laid out and illustrated by recent exclusive meson electroproduction cross sections off free and bound nucleons, new anticipated results, as well as potential upcoming opportunities.
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Derek Leinweber (CSSM, University of Adelaide)6/17/24, 11:00 AM
In the early days of QCD phenomenology, resonances were thought to arise from single-particle constituent-quark-model-like states dressed by their decay channels to become short-lived resonances. The lowest lying resonances were of primary importance and sophisticated models were developed to accommodate them. Here the N*(1440) Roper resonance, its partner the Δ(1600) resonance and...
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Vincent Mathieu (University of Barcelona)6/17/24, 11:30 AM
In this talk, we'll start by motivating the study of two meson photoproduction in association with a nucleon target. Then we'll review the formalism to describe these reactions before showing the latest results from the CLAS and GlueX experimental collaborations at the Jefferson Lab.
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Szymon Harabasz6/17/24, 1:30 PM
The statistical hadronization model is known to describe very well the yields of particles produced in heavy-ion collisions at LHC, RHIC, and SPS over many orders of magnitude. Recently, we have shown [1,2] that at lower energies, not just yields but also spectra of the most abundant particles containing u and d quarks can be reproduced in the thermal model.
Strangeness, heavy compared...
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Victor Mokeev (Thomas Jefferson National Accelerator Facility)6/17/24, 1:30 PM
Understanding the strong interaction dynamics that underlie the emergence of hadron mass (EHM) represents one of the most challenging open problems in hadronic physics. The new opportunities for gaining insight into EHM from the experimental results on the evolution of the N->N electroexcitation amplitudes (the so-called gvpN electrocouplings) with photon virtuality Q^2 will be presented....
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Justin Stevens (College of William and Mary)6/17/24, 1:30 PM
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Di An (Uppsala University)6/17/24, 2:00 PM
The electromagnetic form factors of the hadrons provide important information on the internal structure of hadrons. Perturbative QCD can be applied to calculate form factors of baryons at very high energies but at low and intermediate energies difficulty emerge due to the non-perturbative nature of QCD. In the first part of the talk, I will give an introduction to the dispersion theory, a...
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Prof. Xiaoyan Shen (Intitute of High Energy Physics, Chinese Academy of Sciences)6/17/24, 2:00 PM
e+e− annihilation provide a clean source of baryon excitations. With the large datasets
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of J/psi and psi(3686) collected at BESIII, recent results of excited nucleon states as
well as excited hyperon states from BESIII will be reported, including studies of Xi in
psi(3686)-> K- Lambda Xi+ +c.c. , N in psi(3686) -> p pbar pi0/eta, Lambda and
Sigma in psi(3686)-->Lambda Sigma-bar pi0,... -
Patrick Achenbach (Jefferson Lab)6/17/24, 2:00 PM
Nucleons are the most fundamental bound three-body systems in Nature. With the CLAS12 spectrometer at Jefferson Lab, the spectrum and the structure of nucleon resonances is explored. This includes studies of exclusive $\pi N$, $\pi^+\pi^-p$, $K\Lambda$, and $K\Sigma^0$ electroproduction reactions and the evolution of the electrocouplings of resonances with photon virtuality $Q^2$. Such type of...
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Silvia Niccolai (IJCLab Orsay)6/17/24, 2:25 PM
A key step to improve our understanding of nucleon structure in terms of Generalized Parton
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Distributions (GPDs) is the measurement of Deeply Virtual Compton Scattering on the neutron (nDVCS;
ed → e'nγ(p)). This process provides mainly, in the kinematic range covered at Jefferson Lab, an access
to the GPD E of the neutron, which is the least known and constrained GPD as of today.... -
Sebastian Ciupka (University of Bonn)6/17/24, 2:25 PM
It is experimentally and theoretically challenging to determine the ex-
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act number of exited nucleon states and their properties, since the short
lifetime of these exited states leads to strongly overlapping resonances.
Using a polarized beam, a polarized target or using the polarization
of the recoil nucleon helps to measure single or double polarization
observables, that are needed for... -
Fumiya Oura (Tohoku University)6/17/24, 2:25 PM
Since the prediction of the bound states of a singlet of the color SU(3), the H-dibaryon (uuddss) in 1977[1], discussions regarding the H-dibaryon have persisted. An experimental result on the double-lambda hypernucleus [2] provided a lower limit of H-dibaryon mass very close to the $\Lambda\Lambda$ threshold. However, the possibility of resonant states near the threshold cannot be ruled out...
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Noémie Pilleux (IJCLab, Université Paris Saclay)6/17/24, 2:50 PM
The first polarized target experiment of the CLAS12 program at JLab took place last year, scattering 10.5 GeV electrons on longitudinally polarized protons and neutrons in hydrogenated- and deuterated-ammonia targets. It is of high interest for Deeply Virtual Compton Scattering (DVCS) studies since using polarized electron beams and polarized nucleon targets is necessary for the complete...
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Jia-jun Wu (University of Chinese Academy of Science)6/17/24, 2:50 PM
The structure of the $N^*(1535)$ and $N^*(1650)$ remains puzzling. They strongly couple with $N\pi$, $N\eta$, $\Lambda K$ and $\Sigma K$. However, only the scattering amplitude of $N\pi \to N\pi$ has been measured in experiments. On the other hand, lattice QCD performs calculations from the first principles of QCD theory. The spectrum in the finite volume will provide us with additional...
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Peter Hurck (University of Glasgow)6/17/24, 3:45 PM
Study of the spectrum of hadrons provides important insights into the interaction of the strong force. Photoproduction experiments can play a key role in these investigations and are used in the search for hadrons with conventional as well as exotic quantum numbers, such as mesons with gluonic degrees of freedom.
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The GlueX experiment at Jefferson Lab features a 9 GeV linearly polarized photon... -
Ajay Shanmuga Sakthivasan (HISKP, University of Bonn)6/17/24, 3:45 PM
Our current understanding of hadrons is through QCD, and confinement in QCD leads to a rich spectrum of hadrons. Experimentally, hadronic resonances can appear as peaks in the invariant mass distributions. However, universal parameters of hadronic resonances are encoded theoretically in the poles of the $S$-matrix. Still, not all observed peaks necessarily correspond to hadronic...
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Khépani Raya (University of Michoacan)6/17/24, 4:10 PM
The proton has played a major role in the scientific endeavor. For instance, over a century ago, it exposed the substructure of the atom and, decades later, empirical indications about the existence of quarks. Its scrutiny is thus crucial in understanding the most complicated facets of quantum chromodynamics. In this talk we present a symmetry-preserving scheme, based upon continuum Schwinger...
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Asli Acar6/17/24, 4:15 PM
Theory models [1] predict a total of 44 cascade states below 2.5 GeV. Currently, there are only six Ξ states that have at least a three-star rating in the PDG [2], with the production mechanism of these states still remaining mostly elusive. The goal of the “Very Strange” [3] project is to study the quasi-real photoproduction of cascades to search for missing and new states. This work focuses...
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Ibuki Terashima (Tokyo Metropolitan University)6/17/24, 4:35 PM
We study the properties of the hadron-hadron potentials and quark-antiquark potentials from the viewpoint of the channel coupling[1]. We introduce the effective hadron-hadron potential with coupled to the quark channel.
As an application, we construct a coupled-channel model of $c\bar{c}$ and $D\bar{D}$ to describe exotic hadron $X(3872)$[2].For the obtained nonlocal potentials, we apply...
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Stuart Fegan (University of York)6/17/24, 4:40 PM
As part of the N* program, the CLAS detector in Hall B was used in a series of photoproduction experiments with the intention of performing a complete and over-determined measurement of the polarisation observables associated with strangeness photoproduction. Although sufficient observables have now been measured to enable the associated reaction amplitudes to be determined, facilitating a...
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Karin Schoenning (Uppsala Universitet)6/18/24, 9:00 AM
The progress on the so-called proton radius puzzle has been impressive in recent years. Corresponding advances for unstable baryons such as hyperons are more challenging to achieve, but are eagerly awaited: they would reveal the role of flavour in the strong interaction dynamics governing the femtometer structure of hadrons. Due to the short hyperon life-time, most methods that have been...
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Izabela Ciepał (Institute of Nuclear Physics PAS, Kraków)6/18/24, 9:30 AM
The High Acceptance Di-Electron Spectrometer (HADES) [1], installed at GSI/FAIR Helmholtzzentrum in Darmstadt, was designed for spectroscopy of positron-electron pairs in heavy-ion reactions in the SIS-18 energy range (1-2 GeV/nucleon). The HADES collaboration has measured inclusive e+e- production in proton-nucleus and nucleus-nucleus systems at various...
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Dr Stefan Diehl (Justus Liebig University Giessen and University of Connecticut)6/18/24, 10:00 AM
Generalized Parton Distributions (GPDs) are a well-established tool for the exploration of the 3D nucleon structure. While extensive studies have been performed to unravel the 3D structure of the ground-state nucleon, little is known about the 3D structure of baryon resonances. The nucleon-to-resonance transition GPDs provide a unique tool for exploring the 3D structure and mechanical...
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Prof. Craig Roberts (Nanjing University)6/18/24, 11:00 AM
Visible matter is characterised by a single mass scale; namely, the proton mass. The proton's existence and structure are supposed to be described by quantum chromodynamics (QCD); yet, absent Higgs boson couplings, chromodynamics is scale invariant. Thus, if the Standard Model is truly a part of the theory of Nature, then the distinct qualities of the proton and all its excitations are...
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Patrizia ROSSI (JEFFERSON LAB)6/18/24, 11:30 AM
The initial scientific case for upgrading the Continuous Electron Beam Accelerator Facility (CEBAF) at
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Jefferson Lab (JLab) to 22 GeV will be presented. The proposed physics program encompasses a large
and diverse range of transforamtive investigations centered around the non-perturbative dynamics
inherent in hadron structure and the exploration of strongly interacting systems. It builds... -
Matthias F.M. Lutz (GSI)6/18/24, 1:30 PM
In this talk I discuss the current status of the extraction of Low-energy constants (LEC) in the chiral Lagrangian with three light flavours from current Lattice QCD data. The LEC are adjusted to describe the baryon octet and decuplet masses from a large set of lattice ensembles, where finite-box and discretization effects are considered. Accurate results require an analysis at N^3LO.
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Jan hartmann (University of Bonn)6/18/24, 1:30 PM
In recent years, a new generation of photoproduction experiments measuring not only cross sections but also single and double polarization asymmetries has helped the partial wave analysis groups to provide much more stringent information about the involed reaction multipoles and thus the contributing nucleon resonances. However, almost all existing measurements were obtained using proton...
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xiaorong zhou6/18/24, 1:30 PM
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WEIMIN SONG6/18/24, 2:00 PM
Physicists investigate the subatomic world by bombarding their subject of study with a hail of tiny subatomic “bullets”. From the way these “bullets” bounce off their target one can infer a wealth of detailed information about the target’s structure. Different kinds of subatomic “bullets” probe different aspects of the target, certain important aspects of the force holding atomic nuclei...
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Lorenzo Cimino (University of Mons)6/18/24, 2:00 PM
In addition to conventional hadrons, such as baryons and mesons, quantum chromodynamics predict the existence of other hadronic states based on the principle of colour confinement. Among these, hybrid states are particularly intriguing. They arise from excitation in the gluonic field or, in a constituent approach, from the inclusion of a constituent gluon within the system. In recent years,...
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Reinhard Schumacher (Carnegie Mellon University)6/18/24, 2:00 PM
The well-established $\Lambda(1405)$ hyperon with $J^\pi = \frac{1}{2}^-$ may be a dual structure consisting of two overlapping $I=0$ resonances. Each resonance may couple to $\Sigma\pi$ and $N\overline{K}$ final states, but a direct measurement of these two decays for each resonance has not previously been done. Using the GlueX detector system at Jefferson Lab we have obtained high...
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Jana Rieger (Uppsala University)6/18/24, 2:25 PM
Hadrons physics experiments enable us to obtain a better understanding of the strong force in the non-perturbative regime. Electromagnetic form factors quantify the location and motion of the building blocks of hadrons at the femtometer scale. For stable hadrons the space like form factors are accessible in electron scattering experiments. For short lived baryons like hyperons, these...
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Christian Fischer6/18/24, 2:25 PM
We summarise recent theoretical results on the spectrum of three-
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and four-quark states with strange and charm-quark content obtained
from functional QCD using Dyson-Schwinger and Bethe-Salpeter equations.
We discuss differences and similarities in the spectra of light and strange baryons
and address the flavour dependence and the internal structure of four-quark
states with open and... -
Alessia Fantini (university of Rome Tor Vergata, INFN sez. Tor Vergata)6/18/24, 2:25 PM
The BGOOD experiment at ELSA, with its linearly polarized γ beam and large solid angle detector, is a powerful tool for the investigation of the nucleon structure via meson photoproduction.
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New results of Σ beam asymmetry for η photoproduction off the proton in the
energy range 1250-1730 MeV will be presented. The Σ beam asymmetry has been extracted with an original technique that allows to... -
Shin Hyung Kim (Kyungpook National University)6/18/24, 2:50 PM
The nucleon resonance spectrum provides fundamental information about non-perturbative QCD. The precise data from both photoproduction and hadronic reactions are essential in order to separate the overlapping broad nucleon resonances using a partial-wave analysis (PWA). The J-PARC E45 experiment has been set up to accurately measure the nucleon resonance spectrum through the $\pi N \to \pi\pi...
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Akira Watanabe (University of South China)6/18/24, 2:50 PM
The total and differential cross sections of elastic nucleon-nucleon scattering processes are studied in the framework of holographic QCD, considering the Pomeron and Reggeon exchange in the Regge regime. In our model setup, the Pomeron and Reggeon exchange are described by the Reggeized spin-2 glueball and vector meson propagator, respectively. How those contributions change with the energy...
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Alessandro Pilloni6/18/24, 3:45 PM
A(i)DAPT is a program aiming to utilize AI techniques, in particular
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generative modeling, to support Nuclear and High Energy Physics
experiments. Its purpose is to extract physics directly from data in the
most complete manner possible. Generative models such GANs and
Normalizing Flows are employed to capture the full correlations between
particles in the final state of nuclear reactions.... -
Craig Roberts (Nanjing University), Michael Doering, Ralf Gothe (University of South Carolina), Victor Mokeev (Thomas Jefferson National Accelerator Facility)6/18/24, 3:45 PM
The importance of transition form factors for a complete QCD theory will be experimentally and theoretically motivated and with an introduction of the extraction of consistent helicity-dependent electroexcitation couplings, the panelists strive to initiate an open discussion on the premise of this session.
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Gagik Gavalian (Jefferson Lab)6/18/24, 4:15 PM
Artificial Intelligence (AI) has dramatically transformed the landscape of computing and data processing, marking a paradigm shift in how machines interact with data and perform complex tasks. By leveraging algorithms that can learn from and adapt to data, AI has enabled computers to process and analyze vast amounts of information at speeds and accuracies that were previously unimaginable.
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In... -
Ryan Ferguson (University of Glasgow)6/18/24, 4:40 PM
Current studies of the hadron spectrum are limited by the accuracy and consistency of datasets. Information derived from theory models often requires fits to points at specific values of kinematic variables, which needs interpolation between measured points. In sparse data sets the quantification of uncertainties is problematic.
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Machine Learning is a powerful tool that can be used to build an... -
William Phelps (Christopher Newport University/Jefferson Lab)6/18/24, 5:05 PM
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Stefan Leupold (Uppsala University, Sweden)6/19/24, 9:00 AM
At high energies, the (transition) form factors of hadrons are most sensitive to the respective minimal quark content. At low energies, however, the form factors are dominated by universal features related to pion physics. Only these Goldstone bosons can carry information over large distances. Dispersion theory is used to obtain a model-independent representation of vector-isovector baryon...
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Thomas Jude (The University of Bonn)6/19/24, 9:30 AM
The existence of exotic multi-quark states beyond the conventional valence three quark and quark-antiquark systems has been unambiguously confirmed in the heavy quark sectors. Such states could manifest as single colour bound objects, or evolve from meson-baryon and meson-meson interactions, creating molecular like systems and re-scattering effects near production thresholds. Equivalent...
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Maxim Mai (University of Bonn / The George Washington University)6/19/24, 10:00 AM
The quest of unraveling the nature of excited hadrons necessarily involves determination of universal parameters of these states. Such determinations require input, either from experiment or theory. The challenge in answering these questions from theory arises from the very structure of the theory of strong interaction (QCD).
Lattice gauge theory is the only tool available to us to tackle...
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Dr Alessandro Pilloni6/19/24, 11:00 AM
I will give an overview of the recent activities of the Joint Physics Analysis Center and the plans for the future.
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Gary Robertson (University of Glasgow)6/19/24, 11:30 AM
The quark model predicts exotic hadrons beyond the conventional quark-antiquark mesons and three quark baryons. Exotic candidates have since been observed in the early 2000's. Since then several exotic states have been discovered. LHCb has reported on tetraquark candidates such as the X(3872), the discovery of pentaquark resonances in 2015, and the first double charmed tetraquark. Many...
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Fuminori Sakuma (RIKEN)6/19/24, 1:30 PM
The J-PARC Hadron Experimental Facility was constructed with an aim to explore the origin and evolution of matter in the universe through the experiments with intense particle beams. Over the past decade, many results in particle and nuclear physics have been obtained at the present facility. In order to expand the physics programs to unexplored regions that have never been reached, the...
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Yannick Wunderlich (University of Bonn)6/19/24, 1:30 PM
The talk will summarize progress in the field of complete-experiment analyses, for both the extraction of full spin-amplitudes and for truncated partial-wave analyses. The utility of the obtained results for future experiments will be discussed, in particular in view of photoproduction experiments for both 2-body and multi-particle final-states.
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Daniel Carman (JLab)6/19/24, 1:30 PM
Experimental investigations of the structure of excited nucleon states ($N^*$s) from different exclusive channels in terms of their $\gamma_vpN^*$ electrocouplings over a broad range of $Q^2$ are providing essential insights into the nature of the non-perturbative strong interaction responsible for their generation. Extraction of electrocouplings from analyses of $\pi N$, $\eta N$, and $\pi\pi...
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Prof. Kyungseon Joo (University of Connecticut)6/19/24, 2:00 PM
Inclusive electron scattering cross sections from a hydrogen target at a beam energy of 10.6~GeV have been measured with data
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collected from the CLAS12 spectrometer at Jefferson Laboratory. These data cover a wide kinematic area in invariant mass $W$ of the
final state hadrons from the meson threshold up to 2.5~GeV and in virtual photon four-momentum squared $Q^2$ from 1 to 10~GeV$^2$.
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Johan Messchendorp (University of Groningen)6/19/24, 2:00 PM
The overarching goal in the realm of strong QCD physics is to gain a fundamental understanding of the nature of hadronic matter and its interactions. This involves exploring how Quantum Chromodynamics (QCD) manifests itself on the scales relevant to the formation of hadrons. Identifying the underlying symmetries and degrees of freedom that dictate the observed properties of hadrons is crucial...
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Bingsong Zou (Institute of Theoretical Physics, CAS)6/19/24, 2:00 PM
The three narrow Pc states decaying to J/ψp observed by the LHCb experiment are consistent with earlier predictions for one $\bar D\Sigma_c$ and two $\bar D^*\Sigma_c$ bound states. Their strange partners are expected to exist. Here we present evidence for the production of these N resonances with hidden strangeness in $\gamma p$ reactions, such as γp → ϕp, γp → KΣ, γp → KΣ*, γp → KΣ,...
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Mikhail Bashkanov (University of York)6/19/24, 2:25 PM
Hadrons are strongly interacting systems whose dynamics is driven by complex intercommunication between quarks and gluons. The theory of strong interaction, Quantum ChromoDynamics (QCD) , is supposed to describe all particles, however, due to numerical complexity we are still far away from reaching this goal. In such a situation, experimental knowledge about existing resonances becomes...
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Justin Stevens (College of William and Mary)6/19/24, 2:25 PM
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Lucilla Lanza6/19/24, 2:25 PM
An experimental program has been approved at the Thomas Jefferson National Accelerator Facility to measure the (ep,e’K+)Y reactions to search for new excited baryon states in the mass range from 1.8 GeV to 3 GeV with CLAS12.
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Data have been obtained using electron beams with energies of 6.5, 7.5, and 10.2 GeV, impinging upon a liquid hydrogen target in the CLAS12 center. Scattered electrons... -
Dr Yuri Venturini (CAEN S.p.A)6/19/24, 2:50 PM
Experiments focusing on the structure of excited nucleons rely on sophisticated instrumentation, including wide spectrometers and large calorimeters equipped with a variety of detectors such as SiPMs, silicon microstrip trackers, plastic scintillators, drift tubes, resistive plate chambers and a new generation of position-sensitive detectors with accurate timing capabilities. To meet the...
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Jorge Segovia (Pablo de Olavide U., Seville)6/20/24, 9:00 AM
Modern experimental facilities, new theoretical techniques for the continuum bound-state problem and progress with lattice-regularized QCD may have provided indications that soft quark+quark (diquark) correlations play a crucial role in hadron physics. For example, theory indicates that the appearance of such correlations is a necessary consequence of dynamical chiral symmetry breaking, viz. a...
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Michael Doering (George Washington U and Jefferson Lab)6/20/24, 9:30 AM
Electroproduction reactions reveal the structure of light baryon resonances. Recent results of a simultaneous analysis of $\pi N$, $\eta N$, and $K\Lambda$ electroproduction data with the Juelich-Bonn-Washington (JBW) approach are presented. The extraction of multipoles and their uncertainties is discussed, and preliminary results for transition form factors at the resonance poles are shown.
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Prof. Zhen Hu (CERN)6/20/24, 10:00 AM
The speaker will discuss the new structures reported by the CMS collaboration recently. Three structures are found in the J/ψJ/ψ mass spectrum in pp collisions at 13 TeV, and a model with quantum interference among these structures provides a good description of the data. Among them, a new structure with mass around 6.6 GeV is observed with a local significance > 5σ. Another structure with...
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Anthony Francis (National Yang Ming Chiao Tung University)6/20/24, 11:00 AM
Diquarks are often used as QCD effective degrees of freedom to describe nucleons and other baryons as well as exotic hadrons. However, even though they are successful in describing many of these low lying QCD states they and their properties have been difficult to pin down robustly. Here we present progress in studying diquarks in a gauge-invariant setup through embedding them in a parent...
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Norihito Muramatsu (ELPH, Tohoku University)6/20/24, 11:30 AM
The SPring-8 LEPS2 project explores the nature of hadrons through photoproduction processes by using a photon beam which is linear-polarized uniquely up to 2.4 GeV. One of the main subjects of LEPS2 is a light baryon spectroscopy in the s-channel of various meson photoproduction reactions. For this purpose, the BGOegg experiment was carried out with a detector setup where a liquid hydrogen...
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Teresa Pena (LIP and IST ULisboa)6/20/24, 1:30 PM
Over the years, hadrons and their electromagnetic properties have been probed by a
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variety of scattering experiments, with recent results rising compelling questions and
challenging the way we think about their structure.
In this presentation, I offer an overview of recent advancements in the precise
determination of the evolution of the electromagnetic couplings with squared 4-
momentum... -
Padmanath Madanagopalan (The Institute of Mathematical Sciences, Chennai)6/20/24, 1:30 PM
Baryon-baryon interactions are fundamental to understanding physics
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across diverse length scales. Recent advancements in numerical studies, particularly from a lattice QCD perspective, have provided valuable insights into these interactions involving strange, charm, and bottom quarks. This presentation will discuss the latest developments in this field, emphasizing state-of-the-art... -
Mizuki Sumihama (Gifu university/Osaka University)6/20/24, 1:30 PM
The excited states of the Xi hyperons remain poorly understood due to limited experimental studies. In this presentation, we present our recent studies focusing on Xi and hyperon resonances at the Belle experiment. We aim to shed light on the properties of these states. Furthermore, we provide an overview of the current status of the Belle II experiment, and discuss the prospects for future...
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Han Miao (CERN)6/20/24, 2:00 PM
Measurements of the magnetic and electric dipole moments of particles are pivotal for understanding both Standard Model physics and its potential extensions. However, measuring these properties for short-lived particles presents inherent challenges. This study proposes innovative techniques for directly measuring the electromagnetic dipole moments of charm baryons at the Large Hadron Collider...
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Heinz Clement (Uni Tübingen)6/20/24, 2:00 PM
In charm and beauty sectors a manyfold of exotic multiquark states of tetra- or pentaquark structure have been observed. Since they generally reside close to decay thresholds, they appear as narrow resonances due to the small available phasespace and the fact that the decay products are hadronically stable. In the unflavored sector, however, such multiquark states will appear as broad...
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Dr Hao Jiang (University of Glasgow)6/20/24, 2:00 PM
Pion photoproduction in the $\gamma p \to \pi^0 p$ reaction has been measured in the FROST experiment at the Thomas Jefferson National Accelerator Facility. In this experiment, circularly polarized photons with energies up to 3.082 GeV impinged on a transversely polarized frozen-spin target. Final-state protons were detected in the CEBAF Large Acceptance Spectrometer. Results of the...
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Alessandra Filippi (INFN Torino)6/20/24, 2:25 PM
The investigation of N and Δ excitations, as well as the quest for missing baryonic resonances, remains a central challenge in today’s hadron spectroscopy. Traditional approaches utilizing unpolarized γp cross section measurements are limited in their spectroscopic utility due to the broad width of baryonic intermediate states and their consequent overlap in the mass spectrum. An alternative...
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Giorgia Tonani (University and INFN Milano)6/20/24, 2:25 PM
Electric dipole moments (EDM) of fundamental particles serve as crucial probes for physics beyond the Standard Model. Similarly, magnetic dipole moments (MDM) of baryons provide information on their substructure and serve as experimental benchmarks for testing low-energy Quantum Chromodynamics (QCD) models, particularly those related to non-perturbative QCD dynamics. To expand upon the global...
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Prof. Gernot Eichmann (University of Graz)6/20/24, 2:25 PM
I will present current efforts in describing the properties of dibaryons with functional methods. This work extends previous applications to mesons, baryons and four-quark states using Dyson-Schwinger and Bethe-Salpeter equations, where the spectrum and structure of the states is calculated using quark and gluon degrees of freedom. One particular focus is on the deuteron and its internal...
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Yubing Dong (Institute of High Energy Physics, Chinese Academy of Sciences)6/20/24, 2:50 PM
A theoretical interpretation of d*(2380)(Jp=3+), which was observed by WASA@COSY collaboration, is given [1]. This dibaryon structure is studied on the quark-gluon degrees of freedom with a SU(3) chiral constituent quark model and Resonating Group Method. Its mass and wave function are evaluated using a couple channel calculation with and C8C8 channels. It is found that the hidden-color...
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Axel Schmidt (George Washington University)6/20/24, 2:50 PM
New high-statistics total cross-section data for the $\gamma p \rightarrow J/\psi p$ reaction from GlueX experiment do not show direct evidence of the exotic $P_c(4312)^+$ state observed by the LHCb Collaboration. There is, however, a noticeable ``dip'' structure in the GlueX data near the energy corresponding to the mass of the observed LHCb state. We perform a fit to the GlueX data and find...
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Izabela Ciepał (Institute of Nuclear Physics PAS, Kraków), Philip Cole (Lamar University), Ralf Gothe (University of South Carolina), Shinhyung Kim (Kyungpook National University), Yannick Wunderlich (University of Bonn)6/20/24, 3:45 PM
The focus of the session will be on the spectrum and structure of nucleon resonances (N), as revealed through N electroexcitation amplitudes. Such fundamental information on the mechanisms of strong-coupling QCD is crucial to validating any proposed solution to the theory and explaining the emergence of mass. Precise data from both electron and pion beams are necessary for developing robust...
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Adnan Bashir (University of Michoacan)6/20/24, 3:45 PM
The color dynamics of quarks and gluons favors attractive diquark correlations within color singlet hadrons. These dynamical correlations of finite spatial extent appear to play an important role in studying nucleon transition form factors within a quark-diquark picture. We review existing progress and present some new but partial preliminary results within a simple contact interaction model.
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Dr Stephen Kay (University of York)6/20/24, 4:10 PM
One of the most puzzling aspects of the Standard Model is that the overwhelming majority of the mass of hadronic systems arises from massless and nearly massless objects. From the little that we do understand, we know that mass generation is intricately connected to the internal structure of hadronic systems. Somewhat counter intuitively, it is some of the lightest hadronic objects, the...
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Gilberto Ramalho (Soongsil University)6/20/24, 4:35 PM
We review the recent experimental and theoretical
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advances in the study of the electromagnetic
structure of baryons and transitions between baryon states.
The main focus is in the study of the
$\gamma^\ast N \to N^\ast$ transition amplitudes and multipole form
factors in terms of the squared momentum transfer $Q^2$.
The status of the states... -
Takehiko Saito (GSI)6/21/24, 9:00 AM
Hypernuclei have been studied since the 1950's for understanding the fundamental baryon interaction under the flavored-SU(3) symmetry. We have been experimental investigating hypernuclei with induced reaction of heavy ion beams in the fixed nuclear target, and we recently conducted the WASA-FRS experiment at GSI (FAIR Phase 0). Furthermore, we have been analyzing nuclear emulsion data taken in...
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xiaorong zhou6/21/24, 9:30 AM
The proposed STCF is a symmetric electron-positron beam collider designed to provide e+e− interactions at a centerof-mass energy from 2.0 to 7.0 GeV. The peaking luminosity is expected to be 0.5×10^35 cm−2s−1. STCF is expected to deliver more than 1 ab−1 of integrated luminosity per year. The huge samples could be used to make precision measurements of the properties of XYZ particles; search...
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Moskov Amaryan (Old Dominion University)6/21/24, 10:00 AM
Abstract
For the first time in the history of particle physics high intensity beam
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of neutral long-lived kaons will be used at JLab to study strange hadron
spectroscopy. In this talk I will discuss the possibility to observe
dozens of missing hyperons predicted by LQCD and CQM, but not
yet observed. It will also allow to observe and measure with high accuracy
positions and widths... -
Noémie Pilleux (IJCLab, Université Paris Saclay), Ryan Ferguson (University of Glasgow), Stuart Fegan (University of York)6/21/24, 11:00 AM
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Lorenzo Cimino (University of Mons)6/21/24, 11:10 AM
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Sean Dobbs (Florida State University)6/21/24, 11:15 AM
The GlueX Experiment uses an intense photon beam of with energies up to 12 GeV and a large acceptance spectrometer to study many issues in hadron physics. These characteristics allow in particular for the study of comparatively rare photoproduction processes. The study of doubly strange baryons is particularly interesting for understanding the baryon spectrum, due to many states which are...
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Dr Nicholas Zachariou (University of York)6/21/24, 11:45 AM
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Hamza Atac (Temple University), Dr Nikos Sparveris (Temple University)
The first excited state of the nucleon dominates many nuclear phenomena at energies above the pion-production threshold and plays a prominent role in the physics of the strong interaction. The study of the N →Δ transition form factors (TFFs) allows to shed light on key aspects of the nucleonic structure that are essential for the complete understanding of the nucleon dynamics. An experimental...
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Maxim Alexeev (Università degli studi di Torino, INFN sez. Torino)
The Apparatus for Mesons and Baryon Experimental Research (AMBER) is a high-energy physics project at the CERN’s M2 beam line of the Super Proton Synchrotron (SPS). The broad physics program for the upcoming years includes the measurement of the anti-proton production cross-section in pp, pHe and pD collisions, to provide unique information for astrophysics data interpretation, the measurement...
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Elena Santopinto (INFN Genova)
The main discoveries of Exotics ( tetraquarks and pentaquarks) and the main theoretical predictions or interpretations will be revised.
Theoretical predictions for future experiments will be presented too, not only for multiquark states (tetraquarks and pentaquarks) but also for hybrid states ( quark antiquark + gluon states).
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Farah Afzal
Exploring the excited nucleon spectrum gives insights into the strong interaction dynamics of quantum chromodynamics (QCD) and sheds light on the relevant degrees of freedom for QCD at low energies. In the last two decades, our kowledge of the nucleon excitation spectrum has advanced steadily by studying photoinduced reactions on proton and neutron targets. Measurements of single and double...
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Prof. Ulf-G Meissner (Universitat Bonn & Forschungszentrum Ju lich)
The term two-pole structure refers to the fact that particular single states in the hadron spec- trum as listed in the PDG tables are often two states. In this talk, I will review the status of this emerging field and its consequences for our understanding of bound states in QCD.
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