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

Background: Measurements of the polarization observables {Σ}, P, T, Ox, Oz for the reaction {γ}p {→) KS0 {Σ}+ 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{γ} are produced for each polarization observable. T, Ox and Oz are first time measurements of these observables in this reaction. The extraction of {Σ} 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.