1/N Expansion for Exotic Baryons

Details 1/N Expansion for Exotic Baryons 1/N Expansion for Exotic Baryons

2004-02-02

arxiv.org/abs/hep-ph/0402024v3

JHEP0406:039,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

Major additions: plots of widths and branching ratios, discussion of strong decays of heavy pentaquarks, including consequence

Scientific paper

10.1088/1126-6708/2004/06/039

The 1/N expansion for exotic baryons is developed, and applied to the masses, meson couplings and decay widths. Masses and widths of the 27 and 35 pentaquark states in the same tower as the Theta+ are related by spin-flavor symmetry. The 27 and 35 states can decay within the pentaquark tower, as well as to normal baryons, and so have larger decay widths than the lightest pentaquark Theta. The 1/N expansion also is applied to baryon exotics containing a single heavy antiquark. The decay widths of heavy pentaquarks via pion emission, and to normal baryons plus heavy D^(*),B^(*) mesons are studied, and relations following from large-N spin-flavor symmetry and from heavy quark symmetry are derived.

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