Eur. Phys. J. A (2007) 32: 293-297
https://doi.org/10.1140/epja/i2007-10376-7

Regular Article - Hadron Physics

A possible Ωπ molecular state

¹ Institute of Particle Physics, Huazhong Normal University, Wuhan, PRC
² CCAST (World Laboratory), Beijing, PRC
³ Institute of High Energy Physics, Beijing, PRC

Received: 14 February 2007
Accepted: 14 May 2007
Published online: 31 May 2007

Abstract

The structure of the Ωπ state with isospin I = 1 and spin-parity J ^P = 3/2^- is dynamically studied in both the chiral SU(3) quark model and the extended chiral SU(3) quark model by solving a resonating group method (RGM) equation. The model parameters are taken from our previous work, which gave a satisfactory description of the energies of the baryon ground states, the binding energy of the deuteron, the nucleon-nucleon (NN scattering phase shifts, and the hyperon-nucleon (YN cross-sections. The calculated results show that the Ωπ state has an attractive interaction, and in the extended chiral SU(3) quark model such an attraction can make for an Ωπ quasi-bound state with the binding energy of about several MeV.