Bulletin of the American Physical Society
2017 Fall Meeting of the APS Division of Nuclear Physics
Volume 62, Number 11
Wednesday–Saturday, October 25–28, 2017; Pittsburgh, Pennsylvania
Session JK: Mini-Symposium on Photoproduction Physics with GlueX at JLab II |
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Chair: Vincent Mathieu, Thomas Jefferson National Accelerator Facility Room: City Center B |
Friday, October 27, 2017 10:30AM - 10:42AM |
JK.00001: Amplitudes for exotic states at JPAC Alessandro Pilloni We discuss the activity of the Joint Physics Analysis Center in building models which satisfy S-matrix principles. In particular, we show some results on the analysis of the $\eta \pi$ exotic resonances at COMPASS, and we discuss how to extend our formalism to photon beams to be used in the GlueX experiment. We also discuss a model to fit the $J/\psi p$ spectrum measured at GlueX, of interest for the search of hidden charm pentaquarks. [Preview Abstract] |
Friday, October 27, 2017 10:42AM - 10:54AM |
JK.00002: $J/\psi$ Photoproduction at GlueX Luke Robison The GlueX experiment at Jefferson Lab’s Hall D in Newport News, VA is devoted to the study of hadron spectroscopy by using a photon beam of up to 12 GeV in energy, incident on a proton target. We present the first measurements in 40 years of $J/\psi$ photoproduction from the threshold of 8.2 GeV up to $\sim$11.5 GeV. This measurement provides insight into the gluon distribution and multi-quark correlations in the nucleon. We measure the energy dependence of the cross section of $J/\psi$ photoproduction: $\gamma p \rightarrow$ $J/\psi$, $J/\psi \rightarrow e^+ e^-$. Preliminary results for these measurements are presented and compared to the theoretical models and previous photoproduction measurements in this energy range. [Preview Abstract] |
Friday, October 27, 2017 10:54AM - 11:06AM |
JK.00003: Extended Regge-inspired Models for Meson Photoproduction~ Gary Goldstein Regge pole and cut models are applied to a variety of meson photoproduction channels. Extensions to the kinematic range of recent experiments show interesting departures from canonical parameterization. Some notable cross section and polarization asymmetry predictions are compared with data and show the importance of cuts and Regge trajectory parameters. [Preview Abstract] |
Friday, October 27, 2017 11:06AM - 11:18AM |
JK.00004: Analysis of $\phi$ Spin Density Matrix Elements at the GlueX Experiment Alexander Barnes The analysis of the reaction $\gamma$, $p$ $\rightarrow$ $\phi$, $p$, where $\phi$(1020) decays into $K^+K^-$, is discussed. The preliminary measurement of the $\phi$ spin density matrix elements are shown and compared with past experimental data. This analysis is sensitive to detector acceptances and provides a high-level calibration for GlueX. Additionally, these data test details of s-channel helicity conservation, and they complement other GlueX analyses on the $\rho$ and $\omega$. [Preview Abstract] |
Friday, October 27, 2017 11:18AM - 11:30AM |
JK.00005: Photoproduction of the Cascade Baryons at GlueX Ashley Ernst Multi-strange baryons play an important role in understanding the strong interaction and despite their importance, little is known about such hyperons. Almost all knowledge of the Cascades today stems from Kaon-nucleon interactions in bubble chamber experiments performed in the 1960s and 1970s, of which only the octet and decuplet ground states, $\Xi(1320)$ and $\Xi(1530)$ respectively, are well established. This research uses the GlueX experiment at Jefferson Laboratory to map out the spectrum of doubly-strange Cascade resonances, as well as to measure the spin-parity for each of the detected resonances. The first physics run for GlueX has recently been completed and a clear signature of the $\Xi(1320)$ is observed. The systematics of the Cascade spectrum will be presented motivated by prior discoveries in the $N^*$ program. [Preview Abstract] |
Friday, October 27, 2017 11:30AM - 11:42AM |
JK.00006: Photoproduction of Baryon-Antibaryon Pairs at GlueX Hao Li, Samuel Dai, Viren Bajaj, Naomi Jarvis, Reinhard Schumacher The mechanism of baryon-antibaryon photoproduction has not been extensively studied. Little is known about the dominant exchanges in the $t$-channel or the nature of baryon-like exchanges in the $u$- channel. At GlueX, we are studying the reactions $\gamma p \to \mathcal{\overline{B}B}$$p$, where $\mathcal{\overline{B}B}$ includes $\overline{p}p$ and $\overline{\Lambda}\Lambda$ (with $\Lambda \to \pi^- p, \overline{\Lambda} \to \pi^+ \overline{p}$). Data have been obtained from the respective reaction thresholds up to a beam energy of about 11 GeV. The reactions are also being studied with linearly polarized photons in the energy range between 8.4 and 9 GeV. Kinematic fitting is used for clean extraction of 3 and 5 body final states, respectively. Preliminary spectra from Spring 2016 data will be presented for the angular correlations among the produced particles and for some spin observables including the beam asymmetry $\Sigma$. We expect these measurements to allow identification of the dominant reaction mechanisms at GlueX energies. [Preview Abstract] |
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