Electromagnetic production of Σ0's from the proton: A new fit to recent data

Oren V. Maxwell
Phys. Rev. C 93, 014605 – Published 7 January 2016

Abstract

The reaction epeK+Σ0 has been investigated using a tree-level effective Lagrangian model previously employed by the author to study the γpK+Σ0 reaction. In addition to the Born terms, the model incorporates a number of baryon resonances with spins up to 52 and the two kaon resonances, K(892) and K1(1270). Momentum and energy dependent widths for the nucleon and Δ resonances are included by means of a dynamical model that makes use of empirical on-shell branching ratios. The model parameters are fit to a large pool of photoproduction data from the CLAS and GRAAL collaborations and electroproduction data from the CLAS collaboration. Photoproduction results are presented for the unpolarized differential cross section, the photon beam asymmetry Σ, the hyperon recoil asymmetry P, and the double polarization observables Cx and Cz. Electroproduction results are presented for the virtual photoproduction structure functions σU, σTT, σLT, and σLT. The photoproduction results are compared with the CLAS and GRAAL photoproduction data and with the results of an earlier fit to just the photoproduction data, while the electroproduction results are compared with both recent and older CLAS electroproduction data.

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  • Received 29 October 2015

DOI:https://doi.org/10.1103/PhysRevC.93.014605

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear PhysicsParticles & Fields

Authors & Affiliations

Oren V. Maxwell

  • Department of Physics, Florida International University, Miami, Florida 33199, USA

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Issue

Vol. 93, Iss. 1 — January 2016

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