Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session C06: Minisymposium: 3D Nucleon Structure I |
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Chair: Alexei Prokudin, Penn State Berks Room: Hilton Waikoloa Village Queens 5 |
Tuesday, November 28, 2023 7:00PM - 7:30PM |
C06.00001: Generalized Parton Distributions from lattice QCD: new developments Invited Speaker: Martha Constantinou Generalized parton distributions (GPDs) are important quantities that characterize the 3-D structure of hadrons and complement the information extracted from TMDs. They provide information about the partons’ momentum distribution and also on their distribution in position space. The non-perturbative part of the cross-section of high-energy processes may be expanded in terms of the process's large energy scale. This gives rise to a tower of distribution functions labeled by their twist (mass dimension minus spin). The leading twist (twist-2) contributions have been at the center of experimental measurements, theoretical investigations, and lattice QCD calculations. It has been recognized that twist-3 contributions to distribution functions can be sizable and should not be neglected. However, it is challenging to disentangle them experimentally from their leading counterparts, posing limitations on the structure of the proton. |
Tuesday, November 28, 2023 7:30PM - 7:45PM |
C06.00002: Toward a precision calculation of generalized parton distribution functions Huey-Wen Lin Understanding the three-dimensional internal structure of the nucleon is an important goal for nuclear physics. We present the latest lattice-QCD results on the unpolarized and helicity generalized parton distribution functions (GPDs) for the proton, calculated directly at the physical pion mass, using 2+1+1 flavors of highly improved staggered quarks (HISQ) in ensembles generated by MILC Collaboration. These GPDs are calculated using large-momentum effective theory (LaMET) method at skewnesses $xi=0$ and $xi = 0.25$ with multiple transfer momenta. We study and compare the effects of systematic errors by applying hybrid renormalization schemes with leading renormalon resummation and renormalization-group resummation improvement. |
Tuesday, November 28, 2023 7:45PM - 8:00PM |
C06.00003: Frame dependence of hadron structure Xiangdong Ji For relativistic bound states, their structure is frame dependent. I will make some elementary observations |
Tuesday, November 28, 2023 8:00PM - 8:15PM |
C06.00004: TMDs and PDFs for spin-1 hadrons up to twist 4 Shunzo Kumano, Qin-Tao Song There was recent theoretical progress on transverse-momentum-dependent parton distribution functions (TMDs) and parton distribution functions (PDFs) for spin-1 hadrons at twists 3 and 4. We expect that the field of structure functions for spin-1 hadrons will become an interesting topic in 2020's and 2030' due to experimental projects at the Jefferson Laboratory, the Fermilab, the NICA, the LHCspin, and the electron-ion colliders in US and China. |
Tuesday, November 28, 2023 8:15PM - 8:30PM |
C06.00005: Study of Exclusive Pion Photoproduction from a Nucleon in the Wide Angle Regime: The A$_{LL}$ and K$_{LL}$ experiments Arun Tadepalli The measured differential cross sections for the single neutral/charge pion photoproduction from a nucleon in the wide angle regime (s,-t,-u much larger hadronic scale) disagree with theoretical calculations by {f almost two orders of magnitude} in spite of many years of investigation. |
Tuesday, November 28, 2023 8:30PM - 8:45PM |
C06.00006: Pion gravitational form factors from QCD sum rules Kazuhiro Tanaka We discuss the gravitational form factors (GFFs) for the pion, as matrix element of the energy-momentum tensor in QCD. We construct the QCD sum rules for the quark contribution to the pion GFFs, using the correlator of an axial vector current and the energy-momentum tensor. For this purpose, we combine the operator product expansion of the correlator with the dispersion relation for its matrix element parameterized by the GFFs. In the operator product expansion, we take into account the nonperturbative higher-twist corrections as well as the leading contribution expressed by the pion's twist-two light-cone distribution amplitude. This approach allows us to estimate the soft contribution to the GFFs at not very large momentum transfers. We report our numerical results and compare with the results of the other approaches. |
Tuesday, November 28, 2023 8:45PM - 9:00PM |
C06.00007: Generalized Parton Distributions through universal moment parameterization: gluons at non-zero skewness M. Gabriel G Santiago, YUXUN GUO, Xiangdong Ji, Kyle L Shiells, Jinghong Yang We present a further step toward a global extraction of gluon generalized parton distributions (GPDs). In our previous work we performed the first global analysis of quark GPDs by including lattice quantum chromodynamics (QCD) calculations, global fitted forward parton distribution functions (PDFs), form factors (FFs), and Deeply Virtual Compton Scattering (DVCS) measurements from JLab and Hadron-Electron Ring Accelerator (HERA) to constrain two quark flavors with leading order QCD evolution. There, the inclusion of DVCS did not probe gluon structure at leading order, as the gluon GPDs only enter through evolution. Here, we include HERA measurements of Deeply Virtual Meson Production (DVMP) in order to study gluon GPDs at non-zero skewness using the same moment parameterization ansatz and obtaining results consistent with the previous global fit including lattice QCD calculations and experimental measurements. We concentrate our study on the production of J/Ψ mesons in order to limit quark contributions and thus allow for greater constraints on the gluon GPDs at non-zero skewness. |
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