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Beam Asymmetry measurements in γ p → η ∆+ at GlueX
Fri., Dec. 4, 2020 3:30 p.m.
- Fri., Dec. 4, 2020 4:30 p.m.
Location: Zoom
Abstract: The photo-production mechanism used in the GlueX experiment, located at Jefferson Lab, by impinging an 8.2-8.8 GeV linearly polarized photon beam on a liquid hydrogen target allows the mapping of light mesons in unprecedented detail with particular interest in exotic meson candidates. The experiment uses a solenoid-based hermetic detector to collect data on meson production and decays. The Barrel Calorimeter (BCAL) is a salient detector which provides information towards the reconstruction of detected particle's energy, which is directly related to the amount of light detected by Silicon Photomultipliers (SiPM) that are used as readouts in the BCAL. I will present a brief overview of the LED monitoring system through which SiPM gains are continuously monitored for stability and then the study of SiPM dark rate carried out which gives us the information about the condition of the SiPMs and the irradiation damage. Polarization observables such as the beam asymmetry extracted from the azimuthal angular distributions between the meson production plane and the polarized photon beam, help in understanding production mechanisms and quasi-particle exchange processes using Regge theory. Finally, I will present the preliminary analysis results on the beam asymmetry measurements for η in γ p → η ∆+.