Testing the nature of the Λ(1520) in the J/ψ → K-p and J/ψ → π+π-Λ reactions

L. S. Geng; E. Oset; B. S. Zou

doi:10.1140/epja/i2008-10673-7

EPJ

Testing the nature of the Λ(1520) in the J/ψ → $Mathematical equation: $$ \bar \Lambda $$$ K^-p and J/ψ → $Mathematical equation: $$ \bar \Lambda $$$ π⁺π^-Λ reactions

L. S. Geng¹^*, E. Oset¹ and B. S. Zou²

¹ Departamento de Fısica Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigación de Paterna, Aptdo. 22085, 46071, Valencia, Spain
² Institute of High Energy Physics, Chinese Academy of Sciences, P.O. Box 918(4), 100049, Beijing, China

^* e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Received: 30 July 2008
Revised: 24 September 2008
Published online: 13 November 2008

Abstract

We study the reactions J/ψ → $Mathematical equation: $$ \bar \Lambda $$$ K ^- p and J/ψ → $Mathematical equation: $$ \bar \Lambda $$$ π⁺π^-Λ with a unitary chiral approach. We predict the ratio of the invariant-mass distributions of these two reactions at the Λ(1520) peak position, which is free of the unknown production mechanism and reflects only the properties of the Λ(1520) . An experimental measurement of this ratio will provide the couplings of the Λ(1520) to its decay channels, allowing to test the predictions of the chiral unitary approach on this resonance, which appears as dynamically generated in that approach.

PACS: 14.20.Jn Hyperons – / 12.39.Fe Chiral Lagrangians – / 13.30.Eg Hadronic decays – / 13.75.Jz Kaon-baryon interactions –

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EPJ

Testing the nature of the Λ(1520) in the J/ψ → K-p and J/ψ → π+π-Λ reactions

Conference announcements

Testing the nature of the Λ(1520) in the J/ψ → $Mathematical equation: $$ \bar \Lambda $$$ K^-p and J/ψ → $Mathematical equation: $$ \bar \Lambda $$$ π⁺π^-Λ reactions