Photoproduction ofΛandΣ0hyperons using linearly polarized photons

2016/03/31 by C. Paterson, CLAS Collaboration, C. A. Paterson +99 · 60 citations
Mathematics · Medicine · Physics and Astronomy · #Atomic and Subatomic Physics Research #Mathematics #Medical Imaging Techniques and Applications #Quantum Chromodynamics and Particle Interactions #nucl-ex

paper · pdf · doi:10.1103/physrevc.93.065201

published in Physical Review C 93(6) (American Institute of Physics) · 29 pages, 13 figures

openalex publication_date 2016/06/08 · arxiv created 2016/06/14 · arxiv updated 2016/06/22 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

Background: Measurements of polarization observables for the reactions \stackrelP\ensuremathγp\ensuremath→K⁺\mathrm\ensuremathΛ and \stackrelP\ensuremathγp\ensuremath→K⁺\mathrm\ensuremathΣ⁰ 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 \stackrelP\ensuremathγp\ensuremath→K⁺\mathrm\ensuremathΣ⁰ 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<2.19\phantom\rule4.pt0exGeV, with an angular range \ensuremath-0.75<cos\ensuremathθ_K^\ensuremath⋆<+0.85.Results: The observables extracted for both reactions are beam asymmetry \mathrm\ensuremathΣ, 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.

Citations

• Nucleon resonances within a dynamical coupled-channels model ofπNandγNreactions
• Measurement of beam-recoil observables Ox , Oz and target asymmetry T for the reaction γ p → K+ Λ
• Beam-polarization asymmetries for the p(gamma-->, K+)Lambda and p(gamma-->, K+)Sigma(0) reactions for E(gamma)=1.5-2.4 GeV.
• Big-Bang Nucleosynthesis

Cited by

• Photon beam asymmetry Σ for η and η′ photoproduction from the proton
• Light Baryon Spectroscopy
• N* resonances from K Λ Λ amplitudes in sliced bins in energy
• Kaon Photoproduction and the Λ Decay Parameter α−

Related

• Photoproduction of the Σ+ hyperon using linearly polarized photons with CLAS
• Measurement of single- and double-polarization observables in the photoproduction of π⁺π^-~meson pairs off the proton using CLAS at Jefferson Laboratory
• Measurement of Beam-Recoil Observables C_x and C_z for K⁺Λ Photoproduction
• Polarization observables in double neutral pion photoproduction
• Determination of the polarization observables C_x, C_z, and P for the γd→ K⁰Λ(p) reaction