2023 CAP Congress / Congrès de l'ACP 2023

Beam Asymmetry in γ p → η Δ+ at GlueX

19 Jun 2023, 14:45

15m

UNB Tilley Hall (Rm. 205 (max. 85))

Oral not-in-competition (Graduate Student) / Orale non-compétitive (Étudiant(e) du 2e ou 3e cycle) Nuclear Physics / Physique nucléaire (DNP-DPN) (DNP) M2-4 Hadronic physics, nucleon structure, QCD | Physique hadronique, structure des nucléons, QCD (DPN)

Speaker

Varun Neelamana (University of Regina)

Description

Photoproduction mechanisms studied in the GlueX experiment allows the mapping of light mesons in unprecedented detail with particular interest in exotic meson candidates. This is achieved by impinging an 8.2-8.8 GeV linearly polarized photon beam on a liquid hydrogen target. The measurement of beam asymmetry $\mathrm{\Sigma }$ will help constrain quasi-particle t-channel exchange processes using Regge theory. Understanding the photoproduction exchange mechanisms is a crucial ingredient in establishing hybrid and exotic photoproduced light meson states. $\mathrm{\Sigma }$ is extracted from the azimuthal angular distribution between the meson production plane and the polarized photon beam. In particular, we will report results on the beam asymmetry measurements for $\eta$ in the reaction $\gamma$ p $\to$ $\eta$ ${\mathrm{\Delta }}^{+}$. This reaction with a recoiling ${\mathrm{\Delta }}^{+}$ will allow for comparison and validation of theoretical calculations and provide additional validation of the $\eta$ asymmetry with a recoiling proton. The different isospin of the ${\mathrm{\Delta }}^{+}$ imposes additional restrictions that further constrain allowed Regge exchanges.