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 WW02: V: Hadronic Physics II |
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Sponsoring Units: GHP Chair: Julia Velkovska, Vanderbilt University Room: Virtual Room 2 |
Wednesday, April 26, 2023 8:00AM - 8:12AM |
WW02.00001: Exploring AI Techniques for ALERT Tracking Mikhail Yurov A series of experiments were proposed to study the fundamental structure of light nuclei, such as 2H and 4He. The program focuses on the exploration of the nuclear Generalized Parton Distributions (GPDs), EMC effects, as well as the nature and origin of nuclear effects. The key feature of these measurements is the challenging detection of the low-momentum recoil particles in a large kinematic range (1 < Q2 < 7GeV2 , 0.1 < xB <0.7). For this purpose, A Low Energy Recoil Tracker (ALERT) is being built to work in conjunction with the CLAS12 spectrometer to measure recoil fragments with momenta as low as 70 MeV/c. The ALERT detector consists of a low gain stereo drift chamber and a scintillator array allowing reliable separation of 4He, 3He, 3H, deuterons, and protons. Implementation of new artificial intelligence (AI) track reconstruction methods are proven to be beneficial for experiments conducted at high instantaneous luminosities in which the number of background hits is significantly increased. The improved tracking accuracy and overall particle identification that can be achieved with modern machine-learning techniques are crucial for these experiments. In this talk, a brief highlight of the ALERT program will be given along with the status of the AI-assisted tracking under development. |
Wednesday, April 26, 2023 8:12AM - 8:24AM |
WW02.00002: GPU-based Online Reconstruction for J/ψ TSSA at SpinQuest experiment Eric Fuchey The E1039/SpinQuest experiment at Fermilab will measure the transverse single spin asymmetry (TSSA) in several processes such as J/ψ production and Drell-Yan di-muon pair production, exploiting the 120 GeV unpolarized proton beam from the Fermilab Main Injector on transversely polarized fixed targets of NH3 and ND3. |
Wednesday, April 26, 2023 8:24AM - 8:36AM |
WW02.00003: Two-Photon Exchange Contributions to the $e-n$ Elastic Scattering Cross-section and Related GEM Detectors John A Boyd The nTPE experiment ran as part of the first segment of JLab's SBS program. nTPE is a measurement of the two-photon exchange contribution to the electron-neutron elastic scattering cross section at a four-momentum transfer of $Q^2 = 4.5$,(GeV/c)$^2$. Comparisons of nucleon form factor measurements acquired through polarization transfer and the Rosenbluth technique show discrepancies as the four-momentum transfer, $Q^{2}$, increases. Two photon exchange is strongly favored as the reason for this discrepancy and this experiment assesses the contribution of two-photon exchange in $e$-$N$ elastic scattering processes by elastically scattering electrons off neutrons in a deuterium target. The scattered electrons were detected in the BigBite spectrometer --- which is equipped with a Gas Electron Multiplier (GEM) detector-based tracker --- while the scattered nucleons were detected in a hadron calorimeter located behind the SBS magnet. High background rates (100 kHz/cm$^{2}$) were present during the experiment and require rejection and clean-track reconstruction techniques for proper extraction of physics results. This talk will discuss the nTPE experiment, GEM detector background rejection techniques, and some preliminary analysis results. |
Wednesday, April 26, 2023 8:36AM - 8:48AM |
WW02.00004: Measurements of Deeply Virtual Exclusive ?0 Production with CLAS12 Nicholaus L Trotta The CLAS12 detector at Jefferson Lab was used to study deeply virtual exclusive ?0 electroproduction. Data were collected with a 10.6 GeV polarized electron beam on an unpolarized liquid hydrogen target at Jefferson Lab’s Hall-b by the CLAS collaboration. Generalized Parton Distributions (GPDs), which provide insight into the internal nucleon structure, can be accessed by measurements of beam spin asymmetries of ?0 over large kinematics ranges of -t, x-Bjorken and Q2. These asymmetries and higher dimensional binning allow for a measurement of the modulation of sin?, ALUsin?, and can provide deeper insight into leading twist GPDs, H and E, as well as the next leading twist of chiral odd GPDs. The status of this ongoing analysis will be presented. |
Wednesday, April 26, 2023 8:48AM - 9:00AM |
WW02.00005: Nucleon Detection Efficiency for the Segmented Sampling Hadron Calorimeter Deployed in the Super BigBite Spectrometer Sebastian A Seeds In the first experiment using the Super BigBite spectrometer (SBS), the GMn run group measured elastic neutron and proton cross sections to extract the neutron's magnetic Sachs form factor (GMn, five Q2 points from 3.5 to 13.6 GeV2) and the two photon exchange contribution to electron-neutron elastic scattering (nTPE). Both experiments employed the "ratio" method where d(e,e'p) and d(e,e'n) are measured simultaneously in order to cancel many sources of systematic error in the neutron/proton cross section ratio. While electron detection efficiency from the BigBite arm cancels on the ratio, proton and neutron detection efficiencies in the Hadron Calorimeter (HCal) do not and are necessary for weighted nucleon yields and ultimately cross sections. In this talk HCal detector performance, benchmark simulation results, and preliminary efficiencies from GMn data will be discussed. |
Wednesday, April 26, 2023 9:00AM - 9:12AM |
WW02.00006: MAPS based tracking and vertexing for the future Electron-Ion Collider Nicole J Apadula, Ernst P Sichtermann Experiments at the future Electron-Ion collider pose stringent requirements on the tracking system for the measurement of the scattered electron and charged particles produced in the collision, as well as the position of the collision point and any decay vertices of hadrons containing heavy quarks. Monolithic Active Pixel Sensors (MAPS) offer the possibility of high granularity in combination with low power consumption and low mass, making them ideally suited for these subsystems of the EIC detector(s). This talk will cover hardware R&D aspects towards a well-integrated, large-acceptance, precision tracking and vertexing solution for the EIC based on a new generation of MAPS in 65 nm CMOS imaging technology. |
Wednesday, April 26, 2023 9:12AM - 9:24AM |
WW02.00007: Measurements of the Cosφ and Cos2φ Moments of the Unpolarized SIDIS π+ Cross-section at CLAS12 Richard A Capobianco Semi-inclusive deep inelastic π+ electroproduction has been studied with the CLAS12 detector at Jefferson Laboratory. Data were taken by Run Group A at Hall B of the laboratory using a polarized 10.6 GeV electron beam, interacting with an unpolarized liquid hydrogen target. The collected statistics enable a high-precision study of the Cosφ and Cos2φ azimuthal moments of the unpolarized cross-sections. These azimuthal moments probe the Boer-Mulders function, which describes the net polarization of quarks inside an unpolarized proton, and the Cahn effect, which has a purely kinematic origin. The high statistics data will, for the first time, enable a multidimensional analysis of both moments over a large kinematic range of Q2, xB, z, and PT. We will present the status of this ongoing analysis, including the multidimensional unfolding procedures used for acceptance corrections. |
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