dorsal/arxiv
View SchemaConstituent Quark Model Calculation for a possible J^P=0^-,T=0 Dibaryon
| Authors | Georg Wagner, L. Ya. Glozman, A. J. Buchmann, Amand Faessler |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9502028 |
| URL | https://arxiv.org/abs/nucl-th/9502028 |
| DOI | 10.1016/0375-9474(95)00351-Z |
| Journal | Nucl.Phys. A594 (1995) 263-293 |
Abstract
There exists experimental evidence that a dibaryon resonance d' with quantum numbers J^P=0^-,T=0 and mass 2065 MeV could be the origin of the narrow peak in the (\pi^+ ,\pi^- ) double charge exchange cross--sections on nuclei. We investigate the six--quark system with these quantum--numbers within the constituent quark model, with linear confinement, effective one--gluon exchange at short range and chiral interactions between quarks (\pi and \sigma exchange). We classify all possible six quark states with J^P=0^-,T=0, and with N=1 and N=3 harmonic oscillator excitations, using different reduction chains. The six--quark Hamiltonian is diagonalized in the basis including the unique N=1 state and the 10 most important states from the N=3 shell. We find, that with most of the possible sets of parameters, the mass of such a "dibaryon" lies above the N(939)+N^\ast(1535) threshold. The only possibility to describe the supposed d'(2065) in the present context is to reduce the confinement strength to very small values, however at the expense of describing the negative parity resonances N^\ast. We also analyze the J^P=0^-,T=2,N=1 six--quark state.
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"abstract": "There exists experimental evidence that a dibaryon resonance d\u0027 with quantum\nnumbers J^P=0^-,T=0 and mass 2065 MeV could be the origin of the narrow peak in\nthe (\\pi^+ ,\\pi^- ) double charge exchange cross--sections on nuclei. We\ninvestigate the six--quark system with these quantum--numbers within the\nconstituent quark model, with linear confinement, effective one--gluon exchange\nat short range and chiral interactions between quarks (\\pi and \\sigma\nexchange). We classify all possible six quark states with J^P=0^-,T=0, and with\nN=1 and N=3 harmonic oscillator excitations, using different reduction chains.\nThe six--quark Hamiltonian is diagonalized in the basis including the unique\nN=1 state and the 10 most important states from the N=3 shell. We find, that\nwith most of the possible sets of parameters, the mass of such a \"dibaryon\"\nlies above the N(939)+N^\\ast(1535) threshold. The only possibility to describe\nthe supposed d\u0027(2065) in the present context is to reduce the confinement\nstrength to very small values, however at the expense of describing the\nnegative parity resonances N^\\ast. We also analyze the J^P=0^-,T=2,N=1\nsix--quark state.",
"arxiv_id": "nucl-th/9502028",
"authors": [
"Georg Wagner",
"L. Ya. Glozman",
"A. J. Buchmann",
"Amand Faessler"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/0375-9474(95)00351-Z",
"journal_ref": "Nucl.Phys. A594 (1995) 263-293",
"title": "Constituent Quark Model Calculation for a possible J^P=0^-,T=0 Dibaryon",
"url": "https://arxiv.org/abs/nucl-th/9502028"
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