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arXiv · 2404.19404

Photoproduction of the {\Sigma}+ hyperon using linearly polarized photons with CLAS

CLAS Collaboration·L. Clark·B. McKinnon·D. G. Ireland·D. I. Glazier·K. Livingston·D. Rönchen
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Abstract

Background: Measurements of the polarization observables {\Sigma}, P, T, Ox, Oz for the reaction {\gamma}p {\rightarrow) KS0 {\Sigma}+ using a linearly polarized photon beam of energy 1.1 to 2.1 GeV are reported. Purpose: The measured data provide information on a channel that has not been studied extensively, but is required for a full coupled-channel analysis in the nucleon resonance region. Method: Observables have been simultaneously extracted using likelihood sampling with a Markov-Chain Monte- Carlo process. Results: Angular distributions in bins of photon energy E{\gamma} are produced for each polarization observable. T, Ox and Oz are first time measurements of these observables in this reaction. The extraction of {\Sigma} extends the energy range beyond a previous measurement. The measurement of P, the recoil polarization, is consistent with previous measurements. Conclusions: The measured data are shown to be significant enough to affect the estimation of the nucleon resonance parameters when fitted within a coupled-channels model.

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CLAS Collaboration, L. Clark, B. McKinnon, D. G. Ireland, D. I. Glazier, K. Livingston, D. Rönchen. 2024-04-30. Photoproduction of the {\Sigma}+ hyperon using linearly polarized photons with CLAS. https://arxiv.org/abs/2404.19404

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