Bulletin of the American Physical Society
Fall 2022 Meeting of the APS Division of Nuclear Physics
Volume 67, Number 17
Thursday–Sunday, October 27–30, 2022; Time Zone: Central Daylight Time, USA; New Orleans, Louisiana
Session KC: Hadronic Physics IV |
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Chair: Zuhal Seyma Demiroglu, SUNY Stony Brook Room: Hyatt Regency Hotel Celestin A |
Saturday, October 29, 2022 10:30AM - 10:42AM |
KC.00001: Ξ- Baryon in Electroproduction off of a Proton Target at CLAS12 Jose C Carvajal Baryons with multiple strange quarks played a vital role in the development of the quark model. However, more than half a century after their discovery, Cascade and Omega hyperons are experimentally underexplored. Typically small cross section and the significant change in baryon strangeness from the initial state (S = 0) to final state (S = −2, −3) make the observation of excited states difficult. |
Saturday, October 29, 2022 10:42AM - 10:54AM |
KC.00002: Measurement of the t-dependence for the Beam Asymmetry of Photoproduced η Mesons at GlueX Tolga Erbora, Joerg Reinhold We report on the photoproduction of η mesons studied at the GlueX experiment at Thomas Jefferson National Laboratory in Newport News, VA. A linearly polarized photon beam at energies between 8.2 and 8.8 GeV, incident on a liquid hydrogen target, produces η dominantly through t-channel exchanges. Azimuthal angular distributions of the η, with respect to the direction of the polarized photon facilitate the extraction of the beam asymmetry Σ for the reaction γ→p→ηp. We can understand the production mechanisms of the η by analyzing Ση, which is sensitive to the particles exchanged. Compared to previous GlueX results [1,2], we have access to five times the statistics, thereby allowing us to extend these measurements to values beyond the previous limitation of -t ≤ 1.1 (GeV/c)2. Preliminary results will be shown for events reconstructed from the decay of η→γγ and η→π+π-π0. |
Saturday, October 29, 2022 10:54AM - 11:06AM |
KC.00003: Determination of Kinematical Bins for η and η' Electroproduction with JLab's CLAS12 Detector Isabella T Illari The CLAS12 physics program is involved in the studies of the nucleon resonance spectrum and structure in electroproduction of a large variety of final states. With new CLAS12 data, we can investigate the electroproduction of the η and η' mesons, which provides a useful tool to study nucleon resonances N*. Due to the fact that both η and η' have isospin I = 0 this provides an “isospin filter” that allows us to access nucleon resonances where I = ½. This work uses the 6.5 GeV data collected by CLAS12, with center of mass energy W ∼ 1-3 GeV, photon virtuality Q2 ∼ 0-6 GeV2, and luminosity 54 fb-1. The purpose of this work is to measure the differential cross section for η and η’ electroproduction. For this measurement, we determine the bins and bin sizes for the kinematical parameters W, Q2, cosθ*, and ϕ*. We use a reduced dataset with the missing mass technique for final states ep → e'pX, where X is inferred to be η or η'. Each distribution per bin of the 4 parameters is fit in order to extract the number of η. We can apply similar analysis to η'. Finally, for verification and comparison we perform Monte Carlo simulations. This talk shows preliminary data, and this work is in contrast to the bulk of the current world database, which focuses on πN final states. |
Saturday, October 29, 2022 11:06AM - 11:18AM |
KC.00004: Bottomonium and Charmonium spectrum from the Momentum Space Relativistic Schrodinger Equation Shwe S Oo, Sungwook Lee, Parthapratim Biswas, Khin M Maung We use the momentum-space relativistic Schrodinger equation to fit the bottomonium and charmonium mass spectra. We use the usual, linear plus Coulomb-type potentials and also linear plus Yukawa potentials besides the spin-spin and spin-orbit potentials. The singularities in the linear and Coulomb potentials in momentum space are handled by well-known subtraction methods. We will present the fitted spectra, parameters, and decay rates. |
Saturday, October 29, 2022 11:18AM - 11:30AM |
KC.00005: Measurement of t-dependence of the Beam Asymmetry for a reaction $\gamma$ p $\rightarrow$ $\eta'$ p at GlueX Churamani Paudel, Joerg Reinhold The GlueX experiment is a photoproduction experiment which is located at Thomas Jefferson National Lab in Newport News, Virginia. We report on measurements of the beam asymmetry ($\Sigma$) in the reaction $\gamma p\rightarrow \eta' p$, using a tagged, linearly polarized 9 GeV photon beam incident on a liquid hydrogen target. A previous measurement, which was limited to momentum transfer up to $-t=0.9 $ (GeV/c)$^2$, indicated that the reaction mechanism is dominated by $\rho$ and $\omega$ meson exchanges [1]. Use of higher statistics will allow us to study whether this holds true at higher momentum transfer. We will present the latest results on azimuthal angular distributions, yield asymmetries and beam asymmetries as a function of $-t$ for different $\eta'$ decay modes such as $\eta'$ $ \rightarrow$ $\eta$$\pi^{+}$$\pi^{-}$ and $\eta'$ $\rightarrow$ $\eta$ $\pi^{0}\pi^{0}$. |
Saturday, October 29, 2022 11:30AM - 11:42AM |
KC.00006: Near-threshold J/Psi photoproduction measurement from Hall-C J/Psi-007 experiment Shivangi Prasad J/Psi-007 experiment (E12-16-007) was conducted at Hall-C, Jefferson Lab to measure the near threshold region 2-D differential J/Psi photo production cross section as a function of photon energy E$_gamma$ and mandelstam variable t (momentum transfer from initial photon to the produced JPsi). The experiment utilized a high intensity real photon beam produced by incidence of a 10.6 GeV incident electron beam on a copper radiator situated upstream of a hydrogen target. The produced e$^-$e$^+$ ($\mu^+\mu^-$) pair from the decay of J/Psi was detected using two arm spectrometers in Hall C: the HMS and the SHMS. The scanned photon energy range E$_{\gamma}$ and momentum transfer |t|, are between 9.1 and 10.6 GeV and up to 4.5 GeV^2, respectively. New results from the muons decay analysis of the measured 2-D J/Psi photo production cross section will be presented. |
Saturday, October 29, 2022 11:42AM - 11:54AM |
KC.00007: Cross-Section Measurements of Λ(1405) Photoproduction from CLAS g12 Data Trevor G Reed, Brian Raue, Lei Guo The nature of the Λ(1405) resonance remains an unsolved puzzle despite being predicted in 1959 by Dalitz and Tuan and experimentally confirmed soon thereafter in 1961. It is a I(JP)=0(½-) and strangeness S= -1 state. This resonance has some unusual features and there is currently no firmly established and widely accepted explanation of it. Cross-section data can be very useful in understanding the underlying dynamics at play in photo-nuclear reactions and provide some constraints for theoretical models. Preliminary energy-dependent total and differential cross sections will be presented for 1.45 ≤ Eγ ≤ 5.44 GeV and 0.2 ≤ -t ≤ 7 GeV2 extracted from data collected using the CLAS detector. |
Saturday, October 29, 2022 11:54AM - 12:06PM |
KC.00008: Photoproduction of $K^0\bar{K}^0$ with the GlueX Experiment Gabriel A Rodriguez Linera The GlueX Experiment is a fixed target experiment using a linearly polarized photon beam and nearly 4$\pi$-hermetic detector. |
Saturday, October 29, 2022 12:06PM - 12:18PM |
KC.00009: Studies of L-T Separated K+ Electroproduction Richard L Trotta QCD is characterized by two emergent phenomena: confinement and dynamical chiral symmetry breaking (DCSB). Pion and kaon form factors are of particular interest as they are connected to the Goldstone modes of DCSB. The flavor degrees of freedom of the produced meson selectively probe aspects of the reaction mechanism and the transition from hadronic to partonic degrees of freedom. There has been significant progress in the theoretical description of the nucleon structure in terms of QCD degrees of freedom, in particular through Generalized Parton Distributions (GPDs). The last decade saw a dramatic improvement in the precision of charged pion form factor data and new results have become available on the pion transition form factor. The kaon provides an interesting way to expand these studies, opening the possibility to access the production mechanism involving strangeness. Kaon data at larger virtual photon mass allows one to search for the onset of the partonic picture. In this regime, hard and soft physics have been shown to factorize and GPDs provide the most complete description of non-perturbative physics. The lack of necessary experimental facilities has left a gap in L-T separated data for exclusive K+ production from the proton above the resonance region. The newly upgraded 12 GeV beam energy at Jlab, in addition to the recently built SHMS spectrometer for Hall C, has provided an opportunity to expand the kaon data. The most recent kaon form factor and cross section analysis updates will be discussed showing the impact of E12-09-011, the running Jlab 12 GeV kaon experiment. |
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