Bulletin of the American Physical Society
APS April Meeting 2020
Volume 65, Number 2
Saturday–Tuesday, April 18–21, 2020; Washington D.C.
Session Y04: Polarization and the QCD Nuclear MediumInvited Live
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Sponsoring Units: DNP Chair: Brad Sawatzky, Jefferson Lab Room: Washington 3 |
Tuesday, April 21, 2020 1:30PM - 2:06PM Live |
Y04.00001: Medium modification of nuclear currents in light nuclei from lattice QCD Invited Speaker: Phiala Shanahan The effects of a nuclear medium on the properties of the proton and neutron are of great import to both our understanding of nuclei and to their use as targets in intensity frontier experiments. Using first-principles lattice quantum chromodynamics calculations, the NPLQCD collaboration has determined nuclear effects in the couplings of light nuclei to scalar, axial and tensor quark currents, with a key finding that the scalar coupling can be significantly altered even for nuclei as light as $^3$He. Future calculations that fully quantify the uncertainties in this work will also be discussed. [Preview Abstract] |
Tuesday, April 21, 2020 2:06PM - 2:42PM Live |
Y04.00002: Effective Neutron Polarization in Helium-3 Invited Speaker: Douglas Higinbotham Polarized helium-3 continues to be a popular and effective polarized neutron target since the neutron carries almost all of the polarization of the system. However, as experiments become more precise, the effects of the polarization carried by the protons in polarized helium-3 become increasingly important. Quasi-elastic scattering experiments are being conducted to better understand the initial-state polarization of the three-body system within the helium-3 nucleus and gain insight into the initial-state polarization of helium-3. I will review some of these recent experimental results and discuss their implications for future experiments. [Preview Abstract] |
Tuesday, April 21, 2020 2:42PM - 3:18PM Live |
Y04.00003: Nucleon spin structure results from Jefferson Lab Invited Speaker: Xiaochao Zheng I will present results from recent analysis on the nucleon spin structure measurements at Jefferson Lab. The experimental data have now provided a precise mapping of the nucleon longitudinal spin structure from large to small distances. This achievement went in hand with important theoretical advances such as improvements in Chiral Perturbation Theory, the perspective for lattice QCD to compute structure functions, and the application of Light–Front Holographic QCD to the nucleon spin structure. I will also give a brief outlook for the ongoing 12 GeV JLab program on the nucleon spin structure study. [Preview Abstract] |
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