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Hidden beauty baryon states in the local hidden gauge approach with heavy quark spin symmetry

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Abstract

Using a coupled-channel unitary approach, combining the heavy quark spin symmetry and the dynamics of the local hidden gauge, we investigate the meson-baryon interaction with hidden beauty and obtain several new states of N around 11 GeV. We consider the basis of states η b N, ϒN, BΛ b , BΣ b , B * Λ b , B * Σ b , B * Σ * b and find four basic bound states which correspond to BΣ b , BΣ * b , B * Σ b and B * Σ * b , decaying mostly into η b N and ϒN and with a binding energy about 50–130 MeV with respect to the thresholds of the corresponding channel. All of them have isospin I = 1/2 , and we find no bound states or resonances in I = 3/2 . The BΣ b state appears in J = 1/2 , the BΣ * b in J = 3/2 , the B * Σ b appears nearly degenerate in J = 1/2 , 3/2 and the B * Σ * b appears nearly degenerate in J = 1/2 , 3/2, 5/2. These states have a width from 2–110 MeV, with conservative estimates of uncertainties, except for the one in J = 5/2 which has zero width since it cannot decay into any of the states of the basis chosen. We make generous estimates of the uncertainties and find that within very large margins these states appear bound.

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  1. Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigación de Paterna, Apartado 22085, 46071, Valencia, Spain

    C. W. Xiao & E. Oset

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  1. C. W. Xiao
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Xiao, C.W., Oset, E. Hidden beauty baryon states in the local hidden gauge approach with heavy quark spin symmetry. Eur. Phys. J. A 49, 139 (2013). https://doi.org/10.1140/epja/i2013-13139-y

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