252 research outputs found
Semileptonic decays of heavy baryons in the relativistic quark model
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 and different asymmetries 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.Comment: 22 pages, 9 figure
Heavy baryon spectroscopy
Masses of heavy baryons are calculated in the relativistic quark-diquark
picture. Obtained results are in good agreement with available experimental
data including recent measurements by the LHCb Collaboration. Possible quantum
numbers of excited heavy baryon states are discussed.Comment: 10 pages, 1 figure, talk at XXIV International Baldin Seminar on High
Energy Physics Problems, Sep 17-22, 2018, Dubna, Russi
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