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

### 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 Yes

### Primary authors

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