Jun 2 – 7, 2019
Carnegie Mellon University
America/New_York timezone

Measurement of the Photon Beam Asymmetry $\Sigma$ for $\gamma + p\to K^+\Sigma^0$ at $E_{\gamma}$ = 8.5 GeV in GlueX

Jun 6, 2019, 5:30 PM
30m
Rangos 2

Rangos 2

Contributed Hadron Spectroscopy Hadron Spectroscopy

Speaker

Mr Nilanga Wickramaarachchi (Old Dominion University)

Description

We present measurements of the photon beam asymmetry $\Sigma$ for the reaction $\gamma p\to K^+\Sigma^0$(1193) using the GlueX experiment in Jefferson Lab’s Hall D. Data were collected using a linearly polarized photon beam with energy range 8.2-8.8 GeV incident on a liquid hydrogen target. Asymmetries are measured as functions of Mandelstam variables $t$ and $u$. These are the first exclusive measurements of the photon beam asymmetry $\Sigma$ in this reaction at high energies. In the $t$-channel, results show that the reaction is dominated by the natural-parity exchange of presumably the $K^{*}$(892) meson, as predicted by theoretical models. Results obtained for the $u$-channel are consistent with an intermediate baryon exchange mechanism predicted by theoretical models.

Early Consideration No
Graduate Student Yes

Primary authors

Mr Nilanga Wickramaarachchi (Old Dominion University) Prof. Moskov Amaryan (Old Dominion University)

Presentation materials