Testing the nature of the $\Lambda$(1520) in the $J/\psi\to\bar{\Lambda}K^-p$ and $J/\psi\to\bar{\Lambda}\pi^+\pi^-\Lambda$ reactions

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

Testing the nature of the Λ(1520) in the J/psitobar{Λ}K^-p and J/psitobar{Λ}π^+π^-Λ reactions

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arxiv 0807.4798 v2 pith:ODZK66PZ submitted 2008-07-30 hep-ph

Testing the nature of the Λ(1520) in the J/psitobar{Λ}K^-p and J/psitobar{Λ}π^+π^-Λ reactions

L. S. Geng , E. Oset , B. S. Zou This is my paper

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keywords lambdaapproachreactionschiralratiounitaryallowingappears

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We study the reactions $J/\psi\to\bar{\Lambda}K^-p$ and $J/\psi\to\bar{\Lambda}\pi^+\pi^-\Lambda$ with a unitary chiral approach. We predict the ratio of the invariant mass distributions of these two reactions at the $\Lambda(1520)$ peak position, which is free of the unknown production mechanism and reflects only the properties of the $\Lambda(1520)$. An experimental measurement of this ratio will provide the couplings of the $\Lambda(1520)$ 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.

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Radiative decays of the $\Lambda(1520)$ as a dynamically generated resonance
hep-ph 2026-05 unverdicted novelty 6.0

In the chiral unitary approach with dimensional regularization and new photon-baryon diagrams, the computed Lambda(1520) to gamma Sigma0 width matches BESIII data while the gamma Lambda width underpredicts the CLAS result.