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Pentaquark with diquark correlations in a quark model | Sachiko Takeuchi
; Kiyotaka Shimizu
; | Date: |
1 Nov 2004 | Subject: | hep-ph | Affiliation: | Japan Coll. Social Work, Tokyo) and Kiyotaka Shimizu (Sophia U. | Abstract: | We have investigated uuddsbar pentaquarks by employing quark models with the meson exchange and the effective gluon exchange as qq and qqbar interactions. The system for five quarks is dynamically solved; two quarks are allowed to have a diquark-like qq correlation. It is found that the lowest mass of the pentaquark is about 1947 -- 2144 MeV. There are parameter sets where the mass of the lowest positive-parity state become lower than that of the negative-parity states. Which parity corresponds to the observed peak is still an open question. Relative distance of two quarks with the attractive interaction is found to be by about 1.2 -- 1.3 times closer than that of the repulsive one. The diquark-like quark correlation seems to play an important role in the pentaquark systems. | Source: | arXiv, hep-ph/0411016 | Services: | Forum | Review | PDF | Favorites |
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