H-particle in a chiral quark model |
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| Affiliation: | 1. Variable Energy Cyclotron Centre, 1/AF Bidhan Nagar, Calcutta 700 064, India;2. Saha Institute of Nuclear Physics, 1/AF Bidhan Nagar, Calcutta 700 064, India;3. Bose Institute, 93/1 A. P. C. Road, Calcutta 700 009, India;1. University of Bari/INFN, Bari, Italy;2. Brookhaven National Laboratory, Upton, NY 11973, USA;3. University of California at Los Angeles, Los Angeles, CA 90024, USA;4. Iowa State University, Ames, IA 50011, USA;5. University of Massachusetts, Amherst, MA 01003, USA;6. Massachusetts Institute of Technology, Cambridge, MA 02139, USA;7. Pennsylvania State University, University Park, PA 16802, USA;8. Purdue University, West Lafayette, IN 47907, USA;9. United States Military Academy, West Point, NY 10996, USA;10. Vanderbilt University, Nashville, TN 37235, USA;11. Wayne State University, Detroit, MI 48201, USA;12. Yale University, New Haven, CT 06520, USA |
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| Abstract: | 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 Δ resonance. Since the main source for the bound H-particle is believed to be the color magnetic interaction, which gives the nucleon and Δ 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. |
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