A new N* resonance as a hadronic molecular state

TL;DR

This paper predicts a new N* baryon resonance around 1910 MeV as a hadronic molecule formed from Kbar, N, and K, using three-body calculations and cluster structure analysis.

Contribution

It introduces a novel three-body calculation approach to identify a new N* resonance as a hadronic molecular state involving Kbar, N, and K particles.

Findings

Identified a quasibound N* state at ~1910 MeV.

Demonstrated the cluster structure of the resonance.

Discussed a possible Xi* molecular state.

Abstract

We report our recent work on a hadronic molecule state of the KbarKN system with I=1/2 and J^P=1/2^+. We assume that the Lambda(1405) resonance and the scalar mesons, f_{0}(980), a_{0}(980), are reproduced as quasi-bound states of KbarN and KbarK, respectively. Performing non-relativistic three-body calculations with a variational method for this system, we find a quasibound state of the KbarKN system around 1910 MeV below the three-body breakup threshold. This state corresponds to a new baryon resonance of N* with J^P=1/2^+. We find also that this resonance has the cluster structure of the two-body bound states keeping their properties as in the isolated two-particle systems. We also briefly discuss another hadronic molecular state composed by two Kbar and one N, which corresponds to a Xi^* resonance.