Speaker
Dr
Yuming Wang
(Theoretische Physik 1,Fachbereich 7 (Physik),Universität Siegen)
Description
We derive QCD light-cone sum rules for the hadronic matrix elements
of the heavy baryon transitions to nucleon. In the correlation
functions the $\Lambda_c,\Sigma_c$ and $\Lambda_b$ -baryons are
interpolated by three-quark currents and the nucleon distribution
amplitudes are used. To eliminate the contributions of negative
parity heavy baryons, we combine the sum rules obtained from
different kinematical structures. The results are then less
sensitive to the choice of the interpolating current. We predict
the $\Lambda_{b}\to p$ form factor and calculate the widths of
the $\Lambda_{b}\to p\ell\nu_l$ and $\Lambda_{b}\to p \pi$ decays.
Furthermore, we consider double dispersion relations for the same
correlation functions and derive the light-cone sum rules for the
$\Lambda_cND^{(*)}$ and $\Sigma_cND^{(*)}$ strong couplings. Their
predicted values can be used in the models of charm production in
$p\bar{p}$ collisions.
Primary authors
Prof.
Alexander Khodjamirian
(Theoretische Physik 1,Fachbereich 7 (Physik),Universität Siegen)
Mr
Christoph Klein
(Theoretische Physik 1,Fachbereich 7 (Physik),Universität Siegen)
Prof.
Thomas Mannel
(Theoretische Physik 1,Fachbereich 7 (Physik),Universität Siegen)
Dr
Yuming Wang
(Theoretische Physik 1,Fachbereich 7 (Physik),Universität Siegen)
