Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-10-02
Phys.Lett. B579 (2004) 52-58
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, 1 figure, 4 tables, Revtex4
Scientific paper
We consider the possibility that the lightest pentaquark is a parity even state, with one unit of orbital angular momentum. Working within the framework of a constituent quark model, we show that dominant spin-flavor interactions render certain parity-even states lighter than any pentaquark with all quarks in the spatial ground state. For such states, we focus on predicting the mass and decays of other members of the same SU(3) flavor multiplet. Specifically, we consider the strangeness -2 cascade pentaquarks, which are relatively immune to mixing. We take into account flavor SU(3) breaking effects originating from the strange quark mass as well as from the structure of the spin-flavor exchange interactions themselves. We predict the lightest cascade pentaquarks at approximately 1906 MeV, with a full width about 3 times larger than that of the Theta^+.
Carlson Carl E.
Carone Christopher D.
Kwee Herry J.
Nazaryan Vahagn
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