294 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
Semileptonic baryon decays in the relativistic quark model
The form factors of the weak transitions are
calculated in the framework of the relativistic quark model based on the
quasipotential approach. All relativistic effects including transformations of
the baryon wave functions from the rest to moving reference frame and
contributions of the intermediate negative energy states are systematically
taken into account. The explicit analytic expressions which reliably
approximate the momentum transfer dependence of the form factors in the
whole accessible kinematical range are given. The calculated form factors are
applied for the evaluation of the semileptonic and
() decay rates, different asymmetry
and polarization parameters within helicity formalism. The obtained results are
compared with available experimental data and previous calculations.Comment: 11 pages, 7 figures, v2: normalization of form factors corrected,
extended discussion, published versio
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