Negative parity pentaquarks in large Nc QCD and quark model

Details Negative parity pentaquarks in large Nc QCD and quark model Negative parity pentaquarks in large Nc QCD and quark model

2004-08-26

arxiv.org/abs/hep-ph/0408293v3

Phys.Rev. D71 (2005) 036004

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, one figure, uses youngtab.sty; v3: eq.(40) corrected, final version to appear in PRD

Scientific paper

10.1103/PhysRevD.71.036004

Recently, the 1/Nc expansion has been applied to the study of exotic baryons containing both quarks and antiquarks. We extend this approach to exotic states with mixed symmetric spin-flavor symmetry, which correspond in the quark model to negative parity pentaquarks, and discuss the large Nc predictions for their mass spectrum. The heavy exotics Qbar q^4 transform as 3, 6bar,15 and 15' under flavor SU(3), while the light states include the exotic multiplets 10bar, 27, 35. We give mass relations among these multiplets following from the 1/Nc expansion. In the quark model, the mass splittings between these states are given by color-spin interactions. Using the observation of an anticharmed exotic by the H1 collaboration, we give predictions for the masses of other expected heavy pentaquarks.

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