H-particle in a chiral quark model

✍ Scribed by Kiyotaka Shimizu; Mieko Koyama

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 892 KB
• Volume: 646
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(98)00637-x

✦ Synopsis

In this paper we discuss the binding energy of the H-particle using a chiral quark model, where pion exchange plays an important role to reproduce the mass difference between the nucleon and d resonance. Since the main source for the bound H-particle is believed to be the color magnetic interaction, which gives the nucleon and A mass difference, it is very interesting to investigate whether the chiral quark model gives rise to the bound H-particle or not. We employ an extended resonating group method in order to take into account the possibility of a change of baryon wave functions when two baryons interact with each other. We found that a change of baryon size together with the Hamiltonian which consists of gluon, pseudoscalar meson and sigma meson exchange potentials gives rise to the bound H-particle. The binding energy is found to be about 25 MeV in a hybrid chiral quark model. Differences between the ordinary gluon dominant model and chiral quark models are also investigated. It is found that a pure chiral model has no bound state when the widely used sigma-quark coupling strength is employed.