Exotic baryon multiplets at large number of colors

We generalize the usual octet, decuplet and exotic antidecuplet and higher baryon multiplets to any number of colours Nc. We show that the multiplets fall into a sequence of bands with O(1/Nc) splittings inside the band and O(1)splittings between the bands characterized by exoticness, that is the number of extra quark-antiquark pairs needed to compose the multiplet. Each time one adds a pair the baryon mass is increased by the same constant which can be interpreted as a mass of a quark-antiquark pair. At the same time, we prove that masses of exotic rotational multiplets are reliably determined at large Nc from collective quantization of chiral solitons.

11.15.Pg
12.39.Fe
12.39.Dc
11.30.Rd
hadron spectroscopy
baryon: exotic
multiquark
baryon: multiplet
expansion 1/N: color
symmetry: SU(3)

References(26)

Figures(0)

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