Edinburgh Research Explorer

Photoproduction of Lambda and Sigma(0) hyperons using linearly polarized photons

Research output: Contribution to journalArticle

  • C. A. Paterson
  • D. G. Ireland
  • K. Livingston
  • B. McKinnon
  • K. P. Adhikari
  • D. Adikaram
  • Z. Akbar
  • M. Amaryan
  • S. Anefalos Pereira
  • R. A. Badui
  • J. Ball
  • N. A. Baltzell
  • M. Battaglieri
  • I. Bedlinskiy
  • A. Biselli
  • W. J. Briscoe
  • W. K. Brooks
  • V. D. Burkert
  • D. S. Carman
  • A. Celentano
  • T. Chetry
  • G. Ciullo
  • L. Clark
  • L. Colaneri
  • P. L. Cole
  • N. Compton
  • M. Contalbrigo
  • O. Cortes
  • V. Crede
  • A. D'Angelo
  • R. De Vita
  • A. Deur
  • C. Djalali
  • M. Dugger
  • R. Dupre
  • H. Egiyan
  • A. El Alaoui
  • L. El Fassi
  • E. Fanchini
  • G. Fedotov
  • A. Filippi
  • J. A. Fleming
  • N. Gevorgyan
  • Y. Ghandilyan
  • G. P. Gilfoyle
  • D. I. Glazier
  • G. D. Smith
  • D. P. Watts
  • N. Zachariou
  • L. Zana
  • CLAS Collaboration

Related Edinburgh Organisations

Original languageEnglish
Article number065201
Number of pages14
JournalPhysical Review C
Volume93
Issue number6
DOIs
Publication statusPublished - 8 Jun 2016

Abstract

Background: Measurements of polarization observables for the reactions (gamma) over right arrowp -> K+ Lambda and (gamma) over right arrowp -> K+ Sigma(0) 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 (gamma) over right arrowp -> K+ Sigma(0) reaction have not been reported before now.

Method: Themeasurements 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 <2.19 GeV, with an angular range -0.75 <cos theta(K)* <+0.85.

Results: The observables extracted for both reactions are beam asymmetry Sigma, target asymmetry T, and the beam-recoil double polarization observables O-x and O-z.

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.

    Research areas

  • BEAM, BREMSSTRAHLUNG, OBSERVABLES

ID: 29548439