A schematic model for pentaquarks based on diquarks

Details A schematic model for pentaquarks based on diquarks A schematic model for pentaquarks based on diquarks

2003-10-22

arxiv.org/abs/hep-ph/0310270v3

Phys.Lett. B589 (2004) 21-27

Physics

High Energy Physics

High Energy Physics - Phenomenology

v2 has additional discussion of newly dicoved pentaquarks and limits on their widths, the model is the same as in version 1. N

Scientific paper

10.1016/j.physletb.2004.03.019

QCD instantons are known to produce deeply bound diquarks which may be used as building blocks in the formation of multiquark states, in particular pentaquarks and dibaryons. We suggest a simple model in which the lowest scalar diquark (and possibly the tensor one) can be treated as an independent ``body'', with the same color and (approximately) the mass as a constituent (anti)quark. In this model a new symmetry between states with the same number of ``bodies'' but different number of quarks appear, in particular the 3-``body'' pentaquarks can be naturally related to decuplet baryons. We estimate both the masses and widths of such states, and then discuss the limitations of this model.

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