Doubly heavy-quark baryon spectroscopy and semileptonic decay |
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Authors: | C Albertus E Hernández J Nieves J M Verde-Velasco |
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Institution: | (1) Departamento de Fısica Atómica, Molecular y Nuclear, Universidad de Granada, E-18071 Granada, Spain;(2) Grupo de Fısica Nuclear, Departamento de Fısica Fundamental e IUFFyM, Facultad de Ciencias, E-37008 Salamanca, Spain |
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Abstract: | Working in the framework of a nonrelativistic quark model we evaluate the spectra and semileptonic decay widths for the ground
state of doubly heavy Ξ and Ω baryons. We solve the three-body problem using a variational ansatz made possible by the constraints imposed by heavy-quark
spin symmetry. In order to check the dependence of our results on the inter-quark interaction, we have used five different
quark-quark potentials which include Coulomb and hyperfine terms coming from one-gluon exchange, plus a confining term. Our
results for the spectra are in good agreement with a previous calculation done using a Faddeev approach. For the semileptonic
decay our results for the total decay widths are in good agreement with the ones obtained within a relativistic quark model
in the quark-diquark approximation. |
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Keywords: | 12 39 Jh Nonrelativistic quark model 12 40 Yx Hadron mass models and calculations 13 30 Ce Leptonic semileptonic and radiative decays |
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