Properties of Heavy Baryons in the Relativistic Quark Model

by Dietmar Ebert (Humboldt-Universitaet Berlin)

Friday 31 Aug 2007, 14:00 → 15:00 Europe/Zurich

TH AMPHITHEATRE (CERN)

The mass spectra of the ground state and excited heavy baryons consisting of two light (u,d,s) and one heavy (c,b) quarks are calculated in the heavy-quark--light-diquark approximation within the constituent quark model. The light quarks, forming the diquark, and the light diquark in the baryon are treated completely relativistically. The expansion in v/c up to the second order is used only for the heavy (b and c) quarks. The internal structure of the diquark is taken into account by inserting the diquark-gluon interaction form factor. The obtained diquark and baryon wave functions are used for the calculation of the semileptonic decays of these heavy baryons. 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. An overall good agreement of the obtained predictions with available experimental data is found.

Slides newcern-talk.pdf