Relativistic description of semileptonic decays of heavy baryons

Details Relativistic description of semileptonic decays of heavy baryons Relativistic description of semileptonic decays of heavy baryons

2006-10-18

arxiv.org/abs/hep-ph/0610238v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures, presented at the XXXIII International Conference on High Energy Physics (ICHEP06), Moscow, Russia, 26 July

Scientific paper

Semileptonic decays of heavy baryons consisting of one heavy (Q=b,c) and two light (q=u,d,s) quarks are considered in the heavy-quark--light-diquark approximation. The relativistic quasipotential equation is used for obtaining masses and wave functions of both diquarks and baryons within the constituent quark model. The weak transition matrix elements are expressed through the overlap integrals of the baryon wave functions. The Isgur-Wise functions are determined in the whole accessible kinematic range. The exclusive semileptonic decay rates are calculated with applying the heavy quark 1/m_Q expansion. The evaluated Lambda_b -> Lambda_c l nu decay rate agrees with its experimental value.

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