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GlueX Experiment Document 4429-v1

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

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Nilanga Wickramaarachchi
Updated by:
Nilanga Wickramaarachchi
Document Created:
16 Apr 2020, 12:31
Contents Revised:
16 Apr 2020, 12:31
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16 Apr 2020, 12:31
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In this work the photon beam asymmetry $\Sigma$ for the reaction $\gamma p\to K^+\Sigma^0$(1193) is measured using the GlueX experiment in Hall D at Jefferson Lab. The analysis used data that were collected using a linearly polarized photon beam in the energy range (8.2 - 8.8) GeV incident on a liquid hydrogen target. The beam asymmetries are measured as a function of the Mandelstam variable $t$ and as a single value for the low $u$ region. These are the first exclusive measurements of the photon beam asymmetry $\Sigma$ in this reaction at energies above the baryon resonance region. For the $t$-channel, results are close to unity and show that the reaction is dominated by the natural-parity exchange of the $K^{*}$(892) Regge trajectory as predicted by theoretical models. A value of $\Sigma$ = 0.410$\pm$0.090 is obtained for the $u$-channel and suggests the exchange of both $\Sigma$($J=1/2$) and $Y^{*}$($J=3/2$) trajectory contributions to the production of $K^{+}\Sigma^{0}$.
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