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 LA: From Tagged DIS at JLab to Forward Physics at the EIC |
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Chair: Douglas Higinbotham, Jefferson Lab Room: Ballroom B |
Wednesday, October 13, 2021 2:00PM - 2:36PM |
LA.00001: Forward Tagging at the EIC: From Nucleon Spin to Meson structure Invited Speaker: Dien T Nguyen Understanding the origin of the spin and mass of the nucleon—in particular, how they emerge from partons dynamics — is an overarching challenge for nuclear physics research. In this talk I will present recent progress in the development of an experimental program to address these questions at the forthcoming Electron Ion Collider. First, I will discuss double tagging of spectator protons emitted in the deep inelastic scattering (DIS) of electrons off neutrons in polarized 3He nuclei. These novel processes can only be accessed at the EIC and will lead to a x5 – x10 improvements in the uncertainty of the neutron asymmetry measurement which is crucial for a flavor decomposition of the nucleon spin structure. Next, I will discuss high-impact measurements of pion and kaon structure functions over a wide range of Q2, which provide fundamental insight to the generation of hadronic mass. Both of these measurements, and several others, are made possible by the unique capabilities of the far-forward detection region of the EIC |
Wednesday, October 13, 2021 2:36PM - 3:12PM |
LA.00002: Theoretical Overview of Spectator Tagging in Lepton-Nucleon DIS Invited Speaker: Wim Cosyn Spectator tagging denotes processes on (light) ions where a nucleon or nuclear fragment is detected in the target fragmentation region and the spectator has a slow (0 - few 100 MeV) momentum compared to the ion center-of-mass. Detection of the spectator results in additional control over the initial nuclear configuration of the ion target compared to inclusive scattering where one averages over all possible configurations. In this talk, I discuss the theoretical framework used to describe these reactions, which is based on light-front quantization and results in a natural separation of nuclear and nucleon structure. I give an overview of several applications of spectator tagging in the context of fixed target (Jefferson Lab 12 GeV) and collider (future electron-ion collider) programs . These include free neutron structure, nuclear configuration dependence of medium modifications (EMC effect) and measurements with polarized light ions (deuteron, 3He). I also comment on how final-state interactions with the spectator can modify measured observables. |
Wednesday, October 13, 2021 3:12PM - 3:48PM |
LA.00003: First results from neutron-tagged DIS measurements at JLab with CLAS12 and BAND Invited Speaker: Tyler T Kutz Understanding the origin of the EMC effect - the modification of the internal structure of nucleons bound in nuclei - is an ongoing effort in QCD research with far-reaching implications for our understanding of the fundamental structure of matter. Inclusive measurements have characterized many features of the EMC effect, but are insensitive to the initial state of the nucleus and therefore limited in their ability to pinpoint the mechanisms driving nucleon modification. Recently emerging measurements of tagged deep inelastic scattering (TDIS) from atomic nuclei probe the dependence of quark distribution functions on the initial state of the bound nucleon. The backward angle neutron detector (BAND) was built to measure TDIS off highly-virtual protons in deuterium with the detection of high-momentum spectator neutrons. This novel measurement is sensitive to the bound proton's structure as a function of its initial momentum within the nucleus. This talk will present preliminary results from BAND, which will further our understanding of the EMC effect and its relation to short-range correlations in nuclei. |
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