• Open Access

Photoproduction of Λ and Σ0 hyperons using linearly polarized photons

C. A. Paterson et al. (CLAS Collaboration)
Phys. Rev. C 93, 065201 – Published 8 June 2016

Abstract

Background: Measurements of polarization observables for the reactions γpK+Λ and γpK+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 γpK+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.

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  • Received 22 March 2016

DOI:https://doi.org/10.1103/PhysRevC.93.065201

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Nuclear PhysicsParticles & Fields

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Vol. 93, Iss. 6 — June 2016

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