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

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 $IJ=1/20$ $p\bar{\Sigma }$ resonance state is given in the quark delocalization color screening model.

Comments: 7 pages, 3 figures