Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session C11: Minisymposium: Connections Between Nuclear PDFs and Nuclear Structure I |
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Chair: Douglas Higinbotham, Jefferson Lab Room: Hilton Waikoloa Village Kings 1 |
Tuesday, November 28, 2023 7:00PM - 7:30PM |
C11.00001: Connections Between Nuclear PDFs and High-Momentum Nucleons Invited Speaker: Burcu Duran Earlier experiments at Jefferson Lab observed a possible connection between the EMC effect and contribution of short-range correlations (SRCs) in nuclei which suggests that the modification of the quark distributions of bound protons and neutrons might occur within SRCs. This might raise the possibility of an isospin dependent EMC effect in non-isoscalar nuclei due to the np dominance of the SRCs. However, there has been no conclusive experimental evidence for the isospin dependence or lack thereof for the EMC effect. Recent analyses have investigated the EMC-SRC correlation under two separate assumptions: the dominance of the np pairs contributing to the EMC effect (high virtuality) and the isospin-independent EMC effect (local density), and observed no isospin dependence of the EMC effect. I will give an overview about the earlier measurements and studies trying to shed light on the connection of the EMC effect and SRCs and also, discuss the preliminary results on a universal EMC analysis that was performed using the above-mentioned assumptions and all the existing experimental data. |
Tuesday, November 28, 2023 7:30PM - 7:45PM |
C11.00002: Everything Everywhere All at once Nadia Fomin, John Arrington The XEM2 experiments were recently completed in Hall C of Jefferson Lab. Inclusive measurements were performed on a large range of nuclear targets in the DIS region for studies of the EMC effect as well as the QE region, for short-range correlations studies. Additionally, high Q2 data at x>1 were taken to probe the role of superfast quarks in nuclei. The physics goals of the experiments will be discussed in the context of the field, and an overview of the collected data will be presented. |
Tuesday, November 28, 2023 7:45PM - 8:00PM |
C11.00003: Inclusive Scattering from Nuclei x >1 in the Quasieleastic Regime Zoe Wolters Previous 6 GeV era experiments at Jefferson Lab suggest connections between the value of the 2N SRCs scaling plateau and the slope of the EMC effect. Jefferson Lab, now in the 12 GeV era, ran experiment E12-06-105 to illuminate this correlation. Past measurements of SRCs will be extended to include data from a large number of previously unmeasured nuclei. This experiment yields precision cross-section ratios, comparing nuclear targets to the deuterons (A/D cross section ratios) that will be used to investigate 2N SRCs' nuclear and isospin dependence and its connection to the EMC effect. I will present an update of the status of the analysis of the experiment. |
Tuesday, November 28, 2023 8:00PM - 8:15PM |
C11.00004: Preliminary Results from the 12 GeV EMC Effect Experiment in Jefferson Lab's Hall C Cameron W Cotton In 1983, results published by the European Muon Collaboration (EMC) at CERN suggested that a nucleon's structure is modified when multiple nucleons are bound together in the nuclear environment. This modification, now known as the EMC Effect, was largely unexpected and has been the subject of a significant amount of theoretical and experimental effort to determine its underlying cause. Despite this effort, physicists are still unable to pin down the driving mechanism behind the EMC Effect. |
Tuesday, November 28, 2023 8:15PM - 8:30PM |
C11.00005: Super-fast quarks as a probe of the origin of the EMC effect John R Arrington Four decades after the initial publication showing the EMC effect, we still do not have a well-accepted understanding of what effect, or combination of effects, drives the suppression of the high-x quark distributions in nuclei. Because the x dependence is universal, while the A dependence is weak, many models can approximately reproduce the main EMC effect measurements. Several new observables have been proposed to better understand the origin of the EMC effect, including measurements of the spin and flavor dependence of the EMC effect, and detailed studies of the anomalous A dependence in light nuclei. |
Tuesday, November 28, 2023 8:30PM - 8:45PM |
C11.00006: PDFs and Nuclear Structure in the CJ Global Analysis Shujie Li The CTEQ-JLab collaboration focuses on the global PDF analysis emphasising the impact of large-x, low Q2 deep inelsatic scattering data from Jefferson Lab (JLab). With the carefully studied nuclear effects and higher-twists effects, CJ has unique access to d and u quarks at large x out of the proton and neutron (through deuteron) structure functions. In one of the recent work, CJ teamed up with experimentalists to extract neutron F2 from the world DIS data, and re-examined the Gottfried Sum Rule as well as the non-singlet moments. This talk will present the lastest results on the neutron structure function database and applications, and also discuss potential updates from the new CJ22 parameterizations as well as the on-going study of isospin-dependent higher-twist effects. |
Tuesday, November 28, 2023 8:45PM - 9:00PM |
C11.00007: Light-front holography model of the EMC effect Dmitriy N Kim, Gerald A Miller A new two-component model of the EMC effect based on light-front holographic QCD (LFHQCD) is presented. The model suggests the EMC effect is the result of the nuclear potential breaking SU(6) symmetry. The model separates the F2A nuclear structure function into two parts: a free contribution, involving the addition of proton and neutron structure functions, weighted by the number of protons and neutrons respectively, and a nuclear/medium modified contribution that involves a nucleus-independent universal function. Further, the model displays a correlation between the size of the EMC effect and the SRC pair density a2, extracted from kinematic plateaus at around x > 1 in inclusive quasielastic (QE) scattering.
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Tuesday, November 28, 2023 9:00PM - 9:15PM |
C11.00008: CJ22 global analysis of parton distribution functions Sanghwa Park, Alberto Accardi, Xiaoxian Jing, Joseph F Owens We present the new CJ22 global QCD analysis of parton distribution functions which include new electroweak data from SeaQuest and STAR. The new lepton pair production data from SeaQuest, in particular, provides strong constraints on the dbar/ubar ratio with the extended large-x coverage (x < 0.45), allowing more flexible light-antiquark parameterization than the previous CJ15 analysis. The W boson production in p+p from STAR offers additional constraints on the light antiquarks in the intermediate x region (x < 0.2). The new data are also sensitive to d/u ratio and allow us to explore the correlation between d/u and dbar/ubar. We find that the d/u ratio is smaller than the previously reported value in CJ15, and extrapolates to near 0 as x -> 1 in CJ22. |
Tuesday, November 28, 2023 9:15PM - 9:30PM |
C11.00009: First Measurement of the Flavor Dependence of Nuclear PDF Modification Using Parity-Violating Deep Inelastic Scattering Rakitha S Beminiwattha
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