Bulletin of the American Physical Society
2021 Fall Meeting of the APS Division of Nuclear Physics
Volume 66, Number 8
Monday–Thursday, October 11–14, 2021; Virtual; Eastern Daylight Time
Session MC: 3D Parton Structure of Hadrons: Transverse Momentum Distributions III |
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Chair: Andrew Puckett, University of Connecticut Room: Studio 2 |
Wednesday, October 13, 2021 4:00PM - 4:12PM |
MC.00001: Factorization approach for QED+QCD in semi-inclusive DIS Nobuo Sato, Jianwei Qiu, Wally Melnitchouk, Tianbo Liu In this talk, we will discuss a new approach based on modern factorization techniques to include simultanuesly effects stemming from QED and QCD in semi-inclusive DIS. We will discuss how experimental signal of Siverse and Collins assymetries are modified in the presence of QED effects. |
Wednesday, October 13, 2021 4:12PM - 4:24PM |
MC.00002: On the 3-D Structure of the Pion From Pion-induced Drell-Yan Scattering Leonard Gamberg, Patrick C Barry, Eric Moffat, Wally Melnitchouk, Alexei Prokudin, Nobuo Sato We present a phenomenological study of the transverse momentum distribution (TMD) parton distribution function (PDF) of the pion, from pion-induced Drell-Yan (DY) lepton-pair production with existing pion DY data. For the first time, we describe the matching of the high-transverse momentum (pT) collinear fixed order perturbative QCD pT spectrum, with the low-pT TMD spectrum using the state-of-the-art Collins-Soper-Sterman (CSS) TMD factorization formalism. Within the global QCD analysis framework of the JAM (Jefferson Lab Angular Momentum) Collaboration, we extract the pion TMD PDF using Bayesian inference. This setup will allow us to perform a simultaneous and self-consistent determination of pion and nucleon TMD PDFs from hard processes and map out the 3-D structure of pions. |
Wednesday, October 13, 2021 4:24PM - 4:36PM |
MC.00003: Two-Photon Exchange Effects in Semi-Inclusive Deep-Inelastic Scattering on a Nucleon Andrei Afanasev, Stinson Lee Deep-inelastic scattering of electrons on a nucleon is a primary source of information about parton distribution functions (PDF) and transverse momentum distributions (TMD). The calculation of the QED corrections to SIDIS with any predetermined accuracy is crucial for studies of the 3D structure of the nucleon at JLab and future Electron Ion Collider (EIC). A majority of approved physics experiments that will be running with 12-GeV electron beams at JLab to study the nucleon structure require per-cent level accuracies in the measurements of differential cross sections and polarization asymmetries. Neglecting electromagnetic corrections may lead to significant mis-interpretation of data. Analysis of T-odd singe spin asymmetries (SSA) in SIDIS, p(e,e’h)X, is based on an assumption that purely electromagnetic T-odd effects are negligible. In this talk we will present evaluation of two-photon exchange on azimuthal asymmetries and generation of electromagnetic T-odd spin asymmetries in SIDIS. |
Wednesday, October 13, 2021 4:36PM - 4:48PM |
MC.00004: TMDs extraction with global fits & ANN Ishara P Fernando, Nicholas C Newton, Devin A Seay, Dustin Keller An Artificial Neural Network (ANN) can be trained with regression to simulate Transverse Momentum-dependent Distributions (TMDs). A preliminary analysis in the case of SU(3)flavor TMDs extraction using an ANN with available experimental data will be presented in this talk. |
Wednesday, October 13, 2021 4:48PM - 5:00PM |
MC.00005: T-odd effects in QCD and beyond Dylan Manna, Andrea Signori, Christine Aidala In this talk we will describe a parallel between phenomenological and symmetry-based descriptions of the process dependence of the Time-reversal-odd phenomena in QCD, such as the Sivers effect, with the goal of defining the essential elements that lead to such process dependence in QCD. With the necessary elements clarified across these two complementary descriptions, this will then serve as a starting point to explore possible generalizations in a different gauge theory. |
Wednesday, October 13, 2021 5:00PM - 5:12PM |
MC.00006: Back-to-back proton-pion correlations at CLAS12 Timothy Hayward We report preliminary results from the first measurement of a novel beam-spin asymmetry involving the back-to-back production of a targetfragmentation proton and current-fragmentation $\pi^+$. Non-zero $\sin \Delta \phi$ moments for the semi-inclusive deep inelastic scattering process, $ep \rightarrow P \pi^+ X$, where the $\Delta \phi$ is the difference of azimuthal angles between the two hadrons, indicate that spin-orbit correlations between target and current fragments may be significant. The dependence of the modulation on the product of transverse momenta of two hadrons is consistent with predictions based on the fracture function formalism. Data was taken with the upgraded CLAS12 detector at Jefferson Lab where a 10~GeV electron was scattered off of a liquid hydrogen target during two run periods in 2018 and 2019. |
Wednesday, October 13, 2021 5:12PM - 5:24PM |
MC.00007: Measurement of J/Ψ and Ψ' production in p + p and p + d interaction with 120 GeV proton beam in the Fermilab SeaQuest experiment Ching Him Leung High-mass dimuon production in p + p and p + d interaction has been measured in the SeaQuest experiment with 120 GeV proton beam at Fermilab. The dimuon events measured in SeaQuest contain both the Drell-Yan and the J/Ψ and Ψ' production. Unlike the Drell-Yan process which probes the antiquark distributions in the nucleons, the charmonium production is sensitive to both quark and gluon distributions. We report the measurement of the (p + d) / 2 (p + p) cross section ratios for J/Ψ and Ψ' over the kinematic region of 0.4 < xF< 0.9 and compare these ratios with that of the Drell-Yan events. Unlike the Drell-Yan, we find the J/Ψ and Ψ' ratios to be consistent with unity. The absolute cross sections for J/Ψ and Ψ' production have also been extracted and compared with theoretical calculations. |
Wednesday, October 13, 2021 5:24PM - 5:36PM |
MC.00008: Transverse Spin Sum Rules of the Nucleon Kyle L Shiells, YUXUN GUO, Xiangdong Ji It is known that the total spin of a transversely polarized proton can be expressed in terms of a partonic twist-2 sum rule. In this talk we derive a new twist-3 partonic sum rule for the transverse spin of the proton, which involves the well-known quark spin structure function $g_T(x)=g_1(x)+g_2(x)$, the less-studied but known transverse gluon polarization density $\Delta G_T(x)$, and quark and gluon canonical orbital angular momentum densities associated with transverse polarization. This is the counter part of the sum rule for the longitudinal spin of the proton derived by Jaffe and Manohar previously. We relate the partonic canonical orbital angular momentum densities to a new class of twist-3 generalized parton distribution functions which are potentially measurable in deep-virtual exclusive processes. We also discuss in detail an important technicality related to the transverse polarization in the infinite momentum frame, i.e., separation of intrinsic contributions from the extrinsic ones. |
Wednesday, October 13, 2021 5:36PM - 5:48PM |
MC.00009: Optimized Extraction of Generalized Parton Distributions from Deeply Virtual Compton Scattering Philip Velie, Krisean Allen, Zaki Panjsheeri, Brandon Kriesten, Simonetta Liuti Generalized Parton Distributions (GPDs) are a powerful tool that allows greater insight into the internal structure of the nucleon. GPDs define the matrix elements for the deeply virtual Compton scattering (DVCS) process [1]. I will first present a spectator model calculation for the quark, anti-quark and gluon chiral even GPDs $H,E, \widetilde{H},\widetilde{E}$ in terms of the kinematic variables X, ζ, and t [2]. The model implements the polynomiality and positivity constraints, and it is evolved in perturbative QCD up to next to leading order. I will then illustrate the implementation of computer tensor algebra methods to construct algorithms to optimize the analysis for DVCS, Bethe Heitler, and interference cross-section terms for various beam and target polarizations in the formalism of Ref.[3]. |
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