The Kalman-Tran-D'Souza Model and the Semileptonic Decay Rates of Heavy Baryons

Details The Kalman-Tran-D'Souza Model and the Semileptonic Decay Rates of Heavy Baryons The Kalman-Tran-D'Souza Model and the Semileptonic Decay Rates of Heavy Baryons

2001-01-13

arxiv.org/abs/hep-ph/0101141v1

Nucl.Phys.Proc.Suppl.93:3-8,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, latex, espcrc2.sty (included), 3 figures. The invited talk presented by C.S.K. at the 4-th International Conference o

Scientific paper

10.1016/S0920-5632(00)01047-1

We present an investigation of the inclusive semileptonic decay widths of the heavy baryons Lambda_Q and Xi_Q, (Q=b,c) performed within a relativistic constituent quark model, formulated on the light-front. In a way conceptually similar to the deep-inelastic scattering case, the H_Q baryon inclusive width is expressed as the integral of the free Q-quark partial width multiplied by a bound-state factor related to the Q-quark distribution function in the H_Q. The non-perturbative meson structure is described through the quark-model wave functions, constructed via the Hamiltonian light-front formalism using as input the Kalman-Tran-D'Souza equal time wave functions. A link between spectroscopic quark models and the H_Q decay physics is obtained in this way. It is shown that the bound-state effects and the Fermi motion of the b-quark remarkably reduce the decay rate with respect to the free-quark result. Our predictions for the BR(Lambda_c ->X_s e nu_e) and BR(Lambda_b->X_c e nu_e) decays are in good agreement with existing data.

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