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 FC: Mini-symposium: The Energy Momentum Tensor of Hadrons I |
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Chair: Adam Freese, University of Washington Room: Studio 2 |
Tuesday, October 12, 2021 2:00PM - 2:36PM |
FC.00001: Form Factors of the Energy Momentum Tensor of Hadrons Invited Speaker: Peter J Schweitzer The form factors of the Energy-Momentum Tensor (EMT) allow us to access novel information about the structure of hadrons. This includes the nucleon spin decomposition, the mass decomposition, and the D-term which is the last unknown global property of the nucleon and gives insights on the forces inside hadrons and stability. Recent advances in theory, experiment and phenomenology are reviewed, and the interpretation in terms of EMT densities is discussed. |
Tuesday, October 12, 2021 2:36PM - 2:48PM |
FC.00002: Proton momentum and angular momentum decomposition with overlap fermions Gen Wang, Keh-Fei Liu, Yi-Bo Yang, Terrence Draper, Jian Liang We present a calculation of the proton momentum and angular momentum decomposition using overlap fermions on a 2+1-flavor RBC/UKQCD domain-wall configuration at around 171 MeV which is close to the physical pion mass. A complete determination of the momentum and angular momentum fractions carried by up, down, strange and glue inside proton has been done with valence pion masses varying from 171 to 391 MeV. We have utilized FFT on stochastic sandwith method for connected-insertion parts and the cluster-decomposition error reduction (CDER) technique for disconnected-insertion parts to reduce errors. We carried out the nonperturbative renormalization and mixing for all quantities and final results are reported at the physical pion mass with ${\overline{\rm {MS}}}$(μ = 2 GeV). |
Tuesday, October 12, 2021 2:48PM - 3:00PM |
FC.00003: Abstract Withdrawn
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Tuesday, October 12, 2021 3:00PM - 3:12PM |
FC.00004: Near-threshold quarkonium photo- and electro-production and the QCD energy momentum tensor Yoshitaka Hatta I will discuss recent theory progress in understanding near-threshold photo- and lepto-production of heavy quarkonium in electron-proton scattering. |
Tuesday, October 12, 2021 3:12PM - 3:24PM |
FC.00005: QCD Analysis of Near-Threshold Photon-Proton Production of Heavy Quarkonium YUXUN GUO, Xiangdong Ji, Yizhuang Liu The near threshold photo or electroproduction of heavy vector quarkonium off the proton is studied in quantum chromodynamics. Similar to the high-energy limit, the production amplitude can be factorized in terms of gluonic Generalized Parton Distributions and the quarkonium distribution amplitude. At the threshold, the threshold kinematics has a large skewness parameter ξ, leading to the dominance of the spin-2 contribution over higher-spin twist-2 operators. Thus threshold production data are useful to extract the gluonic gravitational form factors, allowing studying the gluonic contributions to the quantum anomalous energy, mass radius, spin and mechanical pressure in the proton. We use the recent GlueX data on the J/ψ photoproduction to illustrate the potential physics impact from the high-precision data from future JLab 12 GeV and EIC physics program. |
Tuesday, October 12, 2021 3:24PM - 3:36PM |
FC.00006: Threshold Upsilon-meson Photoproduction at EIC and EicC Igor I Strakovsky, William Briscoe, Axel Schmidt, Lubomir Pentchev High-accuracy Upsilon-meson photoproduction data from the EIC and EicC experiments will allow measurement of the near-threshold total cross section of the reaction gpàUpsilon p, from which the absolute value of the Upsilon p scattering length, |alpha(Upsilon p)|, can be extracted using a VMD model. For this evaluation, we used Upsilon-meson photoproduction quasi-data from the QCD approach (the production amplitude can be factorized in terms of gluonic generalized parton distributions and the quarkonium distribution amplitude). A comparative analysis of |alpha(Upsilon p)|$ with the recently determined scattering lengths for omega-p, phi-P, and J/psi-P using the A2, CLAS, and GlueX experimental data are performed. The role of the ``young'' vector-meson effect is evaluated. |
Tuesday, October 12, 2021 3:36PM - 3:48PM |
FC.00007: A near Threshold J/ψ Photo-production Measurement in Hall C at Jefferson Lab Burcu Duran, Sylvester J Joosten, Mark Jones, Zein-Eddine Meziani J/ψ photoproduction 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/ψ photoproduction cross-section as a function of photon energy Eγ and momentum transfer t near-threshold. The E12-16-007 experiment was conducted in the experimental Hall C using a high-intensity bremsstrahlung photon beam generated by a 10.6 GeV incident electron beam traversing a copper radiator upstream of a liquid hydrogen target. We will present the results of our measurement of the two-dimensional J/ψ photoproduction cross-section in photon energy Eγ and t, and their impact on our knowledge of the proton mass radius and the relative quantum anomalous energy contribution to its mass. |
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