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

TL;DR

This paper reports the first measurements of polarization observables for the reaction gamma p to KS0 Sigma+ using linearly polarized photons, providing new data crucial for nucleon resonance analysis.

Contribution

It introduces new measurements of polarization observables in gamma p to KS0 Sigma+ reaction, extending energy range and employing likelihood sampling with MCMC for extraction.

Findings

First measurements of T, Ox, Oz in this reaction

Extended energy range beyond previous studies

Data consistent with prior P measurements

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.