Background: Measurements of polarization observables for the reactions γ - p→K+Λ and γ - p→K+Σ0 have been performed. This is part of a program of measurements designed to study the spectrum of baryon resonances in particular, and nonperturbative QCD in general. Purpose: The accurate measurement of several polarization observables provides tight constraints for phenomenological fits, which allow the study of strangeness in nucleon and nuclear systems. Beam-recoil observables for the γ - p→K+Σ0 reaction have not been reported before now. Method: The measurements were carried out using linearly polarized photon beams incident on a liquid hydrogen target, and the CLAS detector at the Thomas Jefferson National Accelerator Facility. The energy range of the results is 1.71<W<2.19GeV, with an angular range -0.75<cosθK<+0.85. Results: The observables extracted for both reactions are beam asymmetry Σ, target asymmetry T, and the beam-recoil double polarization observables Ox and Oz. Conclusions: Comparison with theoretical fits indicates that, in the regions where no previous data existed, the new data contain significant new information, and strengthen the evidence for the set of resonances used in the latest Bonn-Gatchina fit.
ASJC Scopus subject areas
- Nuclear and High Energy Physics