Two states for the Ξ(1820) resonance

2023/09/07 by Molina, R., Liang, Wei-Hong, Xiao, Chu-Wen +2 · 1 citation
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2309.03618

Abstract

We recall that the chiral unitary approach for the interaction of pseudoscalar mesons with the baryons of the decuplet predicts two states for the Ξ(1820) resonance, one with a narrow width and the other one with a large width. We contrast this fact with the recent BESIII measurement of the K^- Λ mass distribution in the ψ(3686) decay to K^- ΛΞ⁺ , which demands a width much larger than the average of the PDG, and show how the consideration of the two Ξ(1820) states provides a natural explanation to this apparent contradiction.

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