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 KK: Mini-Symposium on Photoproduction Physics with GlueX at JLab III |
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Chair: Alessandro Pilloni, Thomas Jefferson National Accelerator Facility Room: City Center B |
Friday, October 27, 2017 2:00PM - 2:12PM |
KK.00001: Survey of Meson Spectroscopy in the 4$\gamma $ Channel Shuang Han The large acceptance of the GlueX detector provides access to~mesons that decay to multiple photons. A channel that is rich in physics potential is $\gamma +$p$\to $p$+$4$\gamma $ . For example, the photo-production of $\pi^{\mathrm{0}}\pi^{\mathrm{0}}$/$\pi^{\mathrm{0}}\eta $ can be used to study the properties of the f$_{\mathrm{0}}$(980) and a$_{\mathrm{0}}$(980) mesons, respectively, and help discriminate among models for scalars. In this talk, we will present preliminary results from our 4$\gamma $ survey of the Spring 2016 dataset, with emphasis on decays to $\pi^{\mathrm{0}}\eta $ . In addition, we will discuss backgrounds and reconstruction efficiency for upcoming GlueX measurements of the rare decay $\eta \to \pi^{\mathrm{0}}$2$\gamma $ , which will be used to search for a lepto-phobic B boson in the mass range 0.14-0.5 GeV/c$^{\mathrm{2}}$~via $\eta \to \gamma +$B$\to \gamma +$[$\pi ^{\mathrm{0}}\gamma $]. [Preview Abstract] |
Friday, October 27, 2017 2:12PM - 2:24PM |
KK.00002: Peripheral production of $\eta\pi$ resonances Andrew Jackura We present some results on the peripheral production of $\eta\pi$ resonances. The reaction model features general constraints such as unitarity and analyticity. We discuss the formalism for $\pi$- and $\gamma$-beams, and show results on $D$-wave resonance extraction using data from the COMPASS experiment. [Preview Abstract] |
Friday, October 27, 2017 2:24PM - 2:36PM |
KK.00003: Photoproduction of the $b_{1}(1235)$ meson in GlueX Ahmed Foda, Zisis Papandreou The GlueX detector is essentially hermetic, thus allowing reconstruction of all final state particles from photoproduction off a liquid hydrogen target at 9 GeV. In this talk we discuss the channel $\gamma p \rightarrow p \pi^{+} \pi^{-} 4 \gamma$ with focus on the reaction $\gamma p \rightarrow p b_{1}(1235)$, where the axial-vector meson $b_{1}(1235)$ decays to $\omega \pi$.This investigation will commence by inspecting the invariant mass spectra and Dalitz plots as a function of the Mandelstam variable $-t$, to investigate the production mechanism of the $b_1$ and serve as the first step in investigating the decays of heavier mesons to $\omega\pi^0$. [Preview Abstract] |
Friday, October 27, 2017 2:36PM - 2:48PM |
KK.00004: Search for the exclusive photoproduction of a leptophobic B boson at GlueX Cristiano Fanelli An exclusive search for a directly photoproduced leptophobic B boson coupling to the baryon number is performed at GlueX by looking at its main decay channels. The data collected so far can give a significant contribution to this search, and in case of non observation GlueX can improve the existing exclusion limits on the gauge coupling $\alpha_{B}$ by a factor O(100) in the mass region between 450 and 900 MeV. Details of the analysis are presented along with motivations for similar BSM searches at Jefferson Lab. [Preview Abstract] |
Friday, October 27, 2017 2:48PM - 3:00PM |
KK.00005: Particle identification performance at GlueX Yunjie Yang, Cristiano Fanelli, John Hardin, Michael Williams Good particle identification (PID) is crucial to achieving the physics goals of the GlueX experiment at Hall D of Jefferson Lab. Using data from the experiment's successful engineering and early production runs, data-driven studies have been performed of the hadronic PID performance (e.g. $\pi/p$ and $\pi/K$) of the GlueX detector using "standard candles" such as $\Lambda^0$, $K^0_S$ and $\phi$ decays. The results of such studies will be presented. [Preview Abstract] |
Friday, October 27, 2017 3:00PM - 3:12PM |
KK.00006: The GlueX DIRC Detector John Hardin Studying strange final states of mesons and baryons at GlueX requires improved kaon identification. Therefore, the particle identification system will be upgraded with the addition of a DIRC system that will allow K/Pi separation up to 4 GeV (increased from the current 2 GeV). The GlueX DIRC makes use of decommissioned components from the BaBar DIRC and installation is currently underway at Jefferson Laboratory. The design of the system and current status of the installation will be presented. [Preview Abstract] |
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