χc0(1P) decay into [formula omitted] in search of an I = 1, 1/2− baryon state around [formula omitted] threshold

En Wang,Ju-Jun Xie,Eulogio Oset

doi:10.1016/j.physletb.2015.12.060

Abstract

We present the theoretical study of the process χc0(1P)→Σ¯Σπ decay, by taking into account the πΣ and πΣ¯ final state interactions of the final meson-baryon pair based on the chiral unitary approach. We show that the process filters the isospin I=1 in the πΣ channel and offers a reaction to test the existence of an I=1 state with strangeness S=−1 and spin-parity Jp=1/2− around the K¯N threshold predicted by some theories and supported by some experiments.

Highlights

The extraction of baryon resonances from experimental data is one of the important aims in Hadron Physics and much progress has been done in the latest years [1,2,3]
We propose the implementation of this reaction which should settle this issue definitely and might result in the observation of a new baryon resonance in the light sector
We observe a strong cusp structure around the K N threshold when the πΣ interaction is taken into account

Summary

Introduction

The extraction of baryon resonances from experimental data is one of the important aims in Hadron Physics and much progress has been done in the latest years [1,2,3]. The quark models jumped earlier in this arena [13,14,15], but effective theories have contributed their share [16,17,18,19]. The quark models seem to over predict the number of baryon states, giving rise to the problem of the missing resonances. The effective theories give rise to some dynamically generated states as a consequence of the interaction of two hadrons, which fit some of the existing states, and predict new states, most of them in the heavy sectors of charm and beauty. Some of the predictions of these effective theories have been confirmed experimentally. The experimental confirmation came from the work of Ref. The experimental confirmation came from the work of Ref. [7] and the analysis of Ref. [34], but other experiments have come to confirm it too

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Conclusion