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 L03: Hadronic Physics - JLab and Beyond |
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Chair: Abhay Deshpande, Stony Brook University (SUNY) Room: Hilton Waikoloa Village Kings 3 |
Friday, December 1, 2023 9:00AM - 9:15AM |
L03.00001: SoLID program at JLab Zhiwen Zhao An all new detector, Solenoidal Large Intensity Device (SoLID), has been proposed for the Jefferson Lab 12 GeV era. A wide range of experiments were approved for SoLID. They include parity violation in deep inelastic scattering (PVDIS) to test the Standard Model at low energies, semi-inclusive deep inelastic scattering (SIDIS) to study the parton Transverse Momentum Distributions (TMD), Timelike Compton Scattering (TCS) to study the Generalized Parton Distributions (GPD), and J/psi production near threshold to study the QCD gluonic force and proton mass. SoLID will fully utilize the great physics potential of the JLab 12-GeV energy upgrade by combining high luminosities and large acceptance and I will give a brief introduction to the SoLID physics programs. |
Friday, December 1, 2023 9:15AM - 9:30AM |
L03.00002: Extrapolation and statistical bootstrap of nucleon structure function data from the 3H and 3He mirror nuclei experiment Hannah Valenty, Jennifer Rittenhouse West, Fatiha Benmokhtar, Douglas W Higinbotham The Jefferson Lab MARATHON experiment has made deep inelastic scattering measurements on the 3H and 3He mirror nuclei. This data has been used to extract the ratio of the F2n/F2p structure functions over a wide range in Bjorken x. We make use of a mathematical extrapolating function to project the current results to the Bjorken limits and then compare this purely mathematical result to modern theorestical expections. In addition, we will use this data to show how to use a statistical bootstrap to generate an error band. |
Friday, December 1, 2023 9:30AM - 9:45AM |
L03.00003: Photoproduction of KS Pairs at GlueX Nathaniel D Hoffman The GlueX experiment at Jefferson Lab probes the spectrum of light hadrons with a 6-12 GeV linearly polarized beam. We study the KSKS channel at GlueX to investigate the production of light flavorless mesons with even spin, namely the f and a mesons. The f0 states in the 1-2 GeV/c2 mass range are particularly interesting, as there are too many for them to all be qq-bar mesons. One possible explanation is that these states mix with the lightest scalar glueball, which has the same quantum numbers as the f0 mesons (JPC = 0++) and is predicted by lattice simulations to be in the same mass range. The GlueX data from this channel that will be shown contains evidence of multiple overlapping states. We decompose the spin states using several methods of partial-wave analysis, including both mass-independent amplitudes and a K-matrix model. We will also present methods of background subtraction and model selection that lead to the highest-statistics dataset for this channel in photoproduction to date. |
Friday, December 1, 2023 9:45AM - 10:00AM |
L03.00004: Transver Momentum and Azimuthal Dependence of semi-inclusive DIS at JLab Peter Bosted The transverse-momentum and azimuthal dependence of semi-inclusive deep inelastic scattering (SIDIS) is sensitive to both the intrinsic momentum distribution of the quarks in nucleons as well as the details of the hadronization process. We report on spin-averaged SIDIS production of both positively and negatively charged pions from both proton and deuteron targets using a 10.6 GeV electron beam at Jefferson Lab. Scattered electrons were detected in the HMS spectrometer, covering a kinematic range of 0.3< x< 0.5 and 22<5 GeV2. Pions were detected in the SHMS spectrometer, covering the range 0.3t<0.6 GeV. The multiplicity results were fit with an overall magnitude, Gaussian width in t>2, and a distribution in cos(Φ). The Pt widths show a moderate z-dependance and slightly larger values for negative pions than for positive pions. No significant difference is observed between proton and deuteron targets. The azimuthal distributions are very closer to zero, strongly contradicting the dominance of the Cahn twist-2 target mas correction. When folded into global analyses, the 20,000 data points of the present experiment will help pin down the 3D structure of the nucleon. |
Friday, December 1, 2023 10:00AM - 10:15AM |
L03.00005: Inclusive electron scattering off the proton with CLAS12 at JLab Valerii Klimenko Electron scattering data off protons from the CLAS12 detector in Hall B at Jefferson Laboratory have become available and cover a wide kinematic range in W up to 2.5 GeV and Q2 up to 9 GeV2, offering new opportunities to explore inclusive, semi-inclusive, and fully exclusive reactions. A study that aims to extract the inclusive electroproduction cross sections from the CLAS12 data collected at a beam energy of 10.6 GeV from an unpolarized liquid-hydrogen target is now almost finished and preliminary results will be presented. Because of the large acceptance of CLAS12, these data offer a unique opportunity to measure inclusive cross sections at W from the meson electroproduction threshold to 2.5 GeV within any given Q2-bin from 2.5 to 9 GeV2. This unique W - coverage at fixed Q2-values is of particular importance for the extension of our knowledge on the nucleon parton distribution function from the data on F2 structure function in the resonance region. Broad coverage over Q^<9.0 GeV^2 offers promising opportunity to explore the mechanisms underlying the nucleon PDF evolution in the transition from strongly-coupled to perturbative QCD regimes. |
Friday, December 1, 2023 10:15AM - 10:30AM |
L03.00006: Status of the PrimEx-eta Experiment in Hall D at Jefferson Lab Andrew P Smith The η→γγ decay proceeds primarily via the chiral anomaly in QCD, and its decay width is useful for providing critical input to extract fundamental parameters of QCD, such as the η-η' mixing angle and the light quark mass ratio. Previous measurements of this decay width through e+e− collider experiments differ from the result of the sole Primakoff experiment by more than 4σ. To address this discrepancy and to reduce the total uncertainty for the decay width, the PrimEx-eta fixed-target experiment in Hall D at Jefferson Lab (E12- 10-0111) is performing a precision measurement of the η→γγ decay width using the Primakoff method. The final part of the experimental data-taking for PrimEx-eta was just completed in Fall 2022. In this talk we will discuss the status of the experiment and the steps toward extracting the radiative decay width. Simultaneous with the η decay width measurement, the total cross section for Compton scattering off the atomic electrons is being measured. This well-understood QED process is used to verify the overall systematic uncertainties associated with a cross section measurment in the forward direction. In this talk we will also present the results for the integrated total Compton scattering cross section measurement. |
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