Studying high-energy hadronic scattering processes to understand the structure
of nuclei has been the focus of experimental and theoretical studies for more
than three decades now. The Color Glass Condensate(CGC) effective theory has
been developed and used to study high-energy proton-nucleus (pA) collisions in
particular. One of the main approximations adopted in the CGC is the...
We present exploratory analyses of the 3D gluon content of the proton via a study of polarized gluon TMDs at leading-twist, calculated in a spectator model for the parent nucleon. Our approach encodes a flexible parameterization for the spectator-mass density, suited to describe both moderate- and small-x effects. Particular attention will be paid phenomenological applications to angular...
Remote
S.B.L. Amar1,2, amar@frib.msu.edu/netaby1@yahoo.fr
O. Ka2, oumar.ka@ucad.edu.sn
P. Guèye1, gueye@frib.msu.edu
T. Baumann1, baumann@frib.msu.edu
1 Facility for Rare Isotope Beams, Michigan State University, 640 South Shaw Lane, East Lansing, MI 48824
2 Cheikh Anta Diop University, Faculté des Sciences et Techniques, Dakar, Senegal
Abstract. The study of unstable nuclei far from...
Starting from the Weinberg formalism for the construction of fields for arbitrary spin, we propose an algorithm for the construction of the independent operators that enter the scattering amplitude associated with electromagnetic observables. This procedure is advantageous for the systematic study of the structure of hadrons and nuclei, particularly in the case of spin-dependent observables....
A crucial component to the Electron Ion Collider (EIC) program is the collider luminosity, with a target absolute (relative) uncertainty of less than 1% (exceeding 10$^{−4}$ in precision). The luminosity determination will be achieved employing two complementary approaches, one by direct detection of bremsstrahlung photons and another using a Pair Spectrometer (PS) which utilizes e+e-...
We report on the characterization of different types of Silicon Photomultipliers (SiPMs). These sensors are based on Single Photon Avalanche Diodes (SPADs) operating in Geiger regime. All the single SPAD cells have an integrating quenching resistor used to interrupt the avalanche effect lowering the inverse polarization tension. SiPMs are capable of detecting and resolving single photons....
Silicon photomultipliers (SiPMs) are the candidatel photodetector
technologies for the dual-radiator Ring-Imaging Cherenkov (dRICH) detector of the ePIC experiment at the Electron-Ion Collider (EIC).
SiPMs are a cheap and reliable solution with the main drawback being they are radiation sensitive devices. In an effort to understand how these sensors could deteriorate in themoderate...
R&D for the backward-endcap ECal of ePIC
We are conducting R&D for the ePIC electron-endcap electromagnetic calorimeter. It will be composed of bars of scintillating PWO crystals, that we characterized in particular by measuring their temperature-dependent light yield, their optical transmittance and their radiation hardness. The anticipated readout with...
We report the results of the test beam studies performed on a prototype for the high-granularity calorimeter insert for the ePIC detector at the EIC.
The ECAL-sized prototype was constructed using layers of Fe absorber plates and scintillating tiles with silicon photomultipliers. A 4 GeV positron beam from Jefferson Laboratory's Hall D pair spectrometer was used to evaluate its performance....
Measurement of jets and their substructure will provide valuable information about the properties of the struck quarks and their radiative properties in Deep-Inelastic Scattering events. The ePIC Barrel Hadronic Calorimeter (BHCal) will be a critical tool for such measurements. By enabling the measurement of the neutral hadronic component of jets, the BHCal will complement the Barrel...
e study the formation of photon+jet in pp and pPb collisions by implementing the small-x Improved Transverse Momentum Dependent (ITMD) factorization framework, which is ideal for forward particle generation at relatively large transverse momenta and small x. The Color Glass Condensate theory serves as the foundation for the ITMD factorization framework. We analyze the transverse momentum...
We present recent results for the dijet production in proton-proton and proton-lead collisions at the LHC, focusing on the forward rapidity regions detected by the ATLAS calorimeter and the upcoming FoCal extension of the ALICE detector. Our computation utilizes the KATIE Monte Carlo program, which incorporates the small-x improved TMD (ITMD) formalism. The presentation is based on...
The upcoming Electron Ion Collider (EIC) at Brookhaven National Lab will provide novel opportunities to study the structure of nucleons and nuclei. Exclusive reactions in particular, such as Deeply Virtual Compton Scattering (DVCS) and Deeply Virtual Meson Production (DVMP), have clean final states which allow us to effectively extract Generalised Parton Distribution (GPDs). This makes them...
$u$-channel VCS is Compton scattering of a photon off of a proton, involving a near-maximal momentum transfer between the two. In the $\gamma^*p$ center-of-mass frame, the photon and proton recoil backward. The $u$-channel contribution to the VCS cross section is not well understood and may encode unique information about parton distributions within the proton. Recent simulations of...
Generalized parton distributions (GPDs) are off-forward matrix elements of quark and gluon operators that enclose information on the total angular momentum of partons, and so on the spin of hadrons (cf. EMC measurements and spin puzzle). In addition, GPDs enable tomography of the nucleon allowing to study spatial distribution of partons as a function of their momentum. To access GPDs one needs...
The far backward region contains several detectors that are critical for luminosity monitoring. Luminosity measurements provide the required normalisation for all physics studies, without them, determining absolute cross sections would not be possible. The detectors in this region are also vital for some studies, such as XYZ spectroscopy. In this talk, I will provide a brief overview of the...
Coherent vector meson (VM) production provides insights into the gluon structure functions of nuclei and is sensitive to gluon saturation effects. Various works have been dedicated to studying coherent VM production at various ranges of photon virtuality (Q2). The main challenge in reconstructing diffractive observables (like the momentum transfer) arises in accurately reconstructing the...
Remote
We investigated the X(3872) exotic meson candidate and explored the feasibility of researching it using the future Electron-Ion Collider (EIC). X(3872) is a tetraquark candidate: a meson that is composed of four quarks but requires additional investigation. We completed the study based upon the generated values for 10,000 events. The parameters of the exotic meson explored include...
Remote
Inclusive forward particle production in proton-nucleus collisions at small x is an important process in high-energy nuclear collisions. It has been proven that the negative NLO cross section problem in the higher momentum regime of forward rapidity single inclusive hadron production in pA collisions can be solved through the threshold resummation method. In this report, I will present...
Remote.
In this talk, I will introduce the concept of the nucleon energy energy correlator (neec). I will argue how this quantity can be measured in the dis process and present the NLL results
To consolidate figures of merit of a variety of measurements at the Electron-Ion-Collider, it is essential to include radiative corrections in simulations of electron-proton and electron-nucleus collisions. For the time being, there do not exist any automated simulation tools for such reactions,including even only next-to-leading order (NLO) radiative corrections.
In this talk, I will present...
About 50 years ago, it was discovered that $\Lambda$ hyperons are produced polarized in collisions of unpolarized protons on beryllium. Despite enormous experimental and theoretical efforts, the origin of this polarization remains inconclusive to date. The $\Lambda$ polarization has also been observed in various collision systems, from $e^+e^-$ to heavy-ion collisions. A recently proposed...
We explore the potential for SiPM-on-tile calorimetry at the EIC in a ZDC. We find that staggering the layers of scintillating cells, we can significantly improve shower position reconstruction. We also show that a SiPM-on-tile ZDC meets the Yellow Report requirements, and has the potential for further improvements.
Soft photon emission from excited nuclei at the Electron-Ion Collider is a largely unexplored but potentially measurable phenomenon. We are interested in understanding the capabilities of the B0 EM calorimeter to detect and measure these, or any, soft photons.
In the talk, I will explain how we use BeAGLE-generated data of excited Pb Ions, produced from incoherent J/psi production in ePb...
