Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-05-19
Phys.Lett. B385 (1996) 317-323
Physics
High Energy Physics
High Energy Physics - Phenomenology
ps file available via anonymous ftp at ftp://hpteo2.iss.infn.it/
Scientific paper
10.1016/0370-2693(96)00886-6
The transition form factors describing the semileptonic decays of heavy pseudoscalar mesons are investigated within a relativistic constituent quark model formulated on the light-front. For the first time, the form factors are calculated in the whole accessible kinematical region, adopting meson wave functions derived from various effective $q \bar{q}$ interactions able to describe the meson mass spectra. It is shown that the decay rates of the $B \to D \ell \nu_{\ell}$, $D \to K \ell \nu_{\ell}$ and $D \to \pi \ell \nu_{\ell}$ weak decays are mainly governed by the effects of the confinement scale, whereas the $B \to \pi \ell \nu_{\ell}$ decay rate is sensitive to the high-momentum components generated in the meson wave functions by the effective one-gluon-exchange interaction. Our results are consistent with available experimental data and predictions of lattice $QCD$ calculations and $QCD$ sum rules.
Grach I. L.
Narodetskii Ilya M.
Simula Silvano
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