Photoproduction of γpK+Λ*(1520) and decay of Λ*(1520)Kp in the Reggeized framework

Byung-Geel Yu and Kook-Jin Kong
Phys. Rev. C 96, 025208 – Published 23 August 2017

Abstract

Photoproduction of Λ*(1520) resonance of spin-parity 32 off the proton target is investigated within the Regge framework where the reggeization of the t-channel meson exchange is applied for the K(494)+K*(892)+K2*(1430) exchanges in the Born amplitude. The present model is based on two basic ingredients; one is the minimal gauge prescription for the convergence of the reaction and the other is the role of K2* crucial to be consistent with high energy data. Cross sections for total, differential, and photon polarization asymmetry are reproduced without fit parameters and compared with existing data. The LAMP2 and LEPS measurements of the angular distribution of K in the Λ*(1520)Kp decay are investigated and found to be dominated by the decay of Λ* with helicity ±3/2 based on the analysis of the density matrix elements. Detailed discussion on the density matrix elements is given to clarify the analysis of the observable. The reaction mechanism is featured by the dominance of the contact term with K and K2* exchanges following in the low energy region. The K* exchange appears in a minor role. At high energies beyond Eγ5 GeV the role of K2* exchange leads over other exchanges in the reaction process.

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  • Received 23 June 2017

DOI:https://doi.org/10.1103/PhysRevC.96.025208

©2017 American Physical Society

Physics Subject Headings (PhySH)

Particles & FieldsNuclear Physics

Authors & Affiliations

Byung-Geel Yu* and Kook-Jin Kong

  • Research Institute of Basic Sciences, Korea Aerospace University, Goyang, 10540, Korea

  • *bgyu@kau.ac.kr
  • kong@kau.ac.kr

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Issue

Vol. 96, Iss. 2 — August 2017

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