Study of $p\bar{\Lambda}$ and $p\bar{\Sigma}$ systems in constituent quark models

TL;DR

This study investigates proton-antihyperon systems using constituent quark models, finding no s-wave bound states but identifying a potential par{ extSigma} resonance in one model.

Contribution

It applies two constituent quark models to analyze par{ extLambda} and par{ extSigma} interactions, revealing a possible resonance state.

Findings

No s-wave bound state near threshold.

Identification of a par{ extSigma} resonance in one model.

Good agreement with previous scattering data.

Abstract

The $p\bar{\Lambda}$ systems with J=0 and J=1 are dynamically investigated within the framework of two constituent quark models: the chiral quark model and the quark delocalization color screening model. The model parameters are taken from our previous work, which gave a good description of the proton-antiproton S-wave elastic scattering cross section experimental data. The $p\bar{\Lambda}$ elastic scattering processes with coupling to $p\bar{\Sigma}$ state are studied. The results show that, there is no s-wave bound state as indicated by an enhancement near the threshold of $p\bar{\Lambda}$ in $J/\psi$ decay. However, a $IJ = {1/2}0$ $p\bar{\Sigma}$ resonance state is given in the quark delocalization color screening model.