Differential Cross Section and Photon-Beam Asymmetry for the γnK+Σ Reaction at Eγ=1.52.4GeV

H. Kohri et al. (LEPS Collaboration)
Phys. Rev. Lett. 97, 082003 – Published 25 August 2006

Abstract

Differential cross sections and photon-beam asymmetries have been measured for the γnK+Σ and γpK+Σ0 reactions separately using liquid deuterium and hydrogen targets with incident linearly polarized photon beams of Eγ=1.52.4GeV at 0.6<cosΘcmK<1. The cross section ratio of σK+Σ/σK+Σ0, expected to be 2 on the basis of the isospin 1/2 exchange, is found to be close to 1. For the K+Σ reaction, large positive asymmetries are observed, indicating the dominance of K* exchange. The large difference between the asymmetries for the K+Σ and K+Σ0 reactions cannot be explained by simple theoretical considerations based on Regge model calculations.

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  • Received 6 February 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.082003

©2006 American Physical Society

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Vol. 97, Iss. 8 — 25 August 2006

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