Bulletin of the American Physical Society
APS April Meeting 2023
Volume 68, Number 6
Minneapolis, Minnesota (Apr 15-18)
Virtual (Apr 24-26); Time Zone: Central Time
Session AA02: V: Mini-Symposium: Opportunities with JLab Upgrades in Energy, Luminosity, and a Positron BeamMini-Symposium
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Sponsoring Units: DNP Chair: Harutyun Avagyan, Jefferson Lab/Jefferson Science Associate Room: Virtual Room 2 |
Monday, April 24, 2023 8:00AM - 8:12AM |
AA02.00001: Studying target fragmentation from CLAS12 to JLab22 Timothy Hayward The study of the properties of hadrons produced in the target fragmentation region (TFR) serve as a test of our complete understanding of the production mechanisms in SIDIS and provide additional information on QCD dynamics that are not accessible in the current fragmentation region. We report results for a number of TFR sensitive measurements, with data taken by the CLAS12 Detector in Hall B of Jefferson Lab, that can be interpreted in terms of fracture functions, the conditional probability for the target remnant to form a specific hadron given an ejected quark. Measurements related to single hadron production, where a clear sign change is observed that captures the transition between both hemispheres, and back-to-back dihadron production, which provide access to the complete list of leading-twist fracture functions, will be presented. Finally, prospects for polarized target measurements at CLAS12 and future measurements at an upgraded JLab22 will be discussed. It will be argued that an upgraded JLab would play a critical role in mapping out this novel area of nucleonic structure, particularly in several ways that the EIC may not be optimal for. |
Monday, April 24, 2023 8:12AM - 8:24AM |
AA02.00002: Exploring mesonic content of the nucleon and meson structure with 22 GeV JLab Dipangkar Dutta The tagged deep inelastic scattering (TDIS) experiment at JLab will probe the elusive mesonic content of the nucleon and access the meson structure function via the Sullivan process. Being a pioneering experiment it will cover a rather limited kinematic region with the 11 GeV beam. The proposed upgrade of the JLab beam energy to 22 GeV will allow a dramatically larger kinematic coverage. It will also become feasible to measure semi-inclusive deep inelastic scattering (SIDIS) off the pion in proton to pion fluctuations. Further, by extending these measurements on other light nuclei such as 3He and 4He it may be possible to study the long sought after ``nuclear pions''. This talk will explore all of these possibilities that will open up at a 22 GeV JLab. |
Monday, April 24, 2023 8:24AM - 8:36AM |
AA02.00003: Target Fragmentation Studies Xuanbo Tong Semi-inclusive deep-inelastic scattering(SIDIS) is an essential process for probing the nucleon structure in experiments at JLab and future EIC. While most SIDS studies focus on the current fragmentation region, the target fragmentation region(TFR) is relatively little studied. In this talk, I will discuss some recent progresses on the higher-twist effects of SIDIS in TFR. I will first discuss the twist-3/4 factorization of structure functions at low transverse momentum and show that they can be expressed in terms of the collinear fracture functions. The properties of these fracture functions are discussed as well. Then I will turn to the studies of higher-twist effects at large transverse momentum in TFR and discuss the re-factorization of the fracture function. These studies provide insight into the nucleon structure when a hadron is generated from the target remnant. |
Monday, April 24, 2023 8:36AM - 8:48AM |
AA02.00004: Opportunities for TMD physics with JLab upgrades Alexey Vladimirov The JLab 22 GeV upgrades will provide unique opportunities for understanding the TMD picture of hadron. The anticipated kinematic will cover energies from where the TMD factorization theorem is applicable down to the energies where it is undoubtedly broken. Therefore, the upgraded JLab machine can be used to study factorization-breaking mechanisms and power corrections to the TMD factorization theorem. I present a discussion of tools and methods that can be applied to quantify the factorization-breaking effects. |
Monday, April 24, 2023 8:48AM - 9:00AM |
AA02.00005: Upgrade the Forward Calorimeter with a PbWO4 Insert in Hall D at JLab Liping Gan, Arshak Asaturyan The Jefferson Lab Eta Factory (JEF) experiment will test QCD at the confinement scale and search for new physics beyond the Standard Model in the eta and eta' meson decays. This experiment will utilize the GlueX apparatus and an upgraded Forward Calorimeter (FCAL-II) with a high resolution and high granularity PbWO4 crystal calorimeter in the central region to suppress the backgrounds due to overlap showers in the calorimeter for the eta and eta' rare decay channels. This PbWO4 Calorimeter will consist of 1596 crystal modules. The design of FCAL-II and the current status of development will be discussed. |
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