Weak decay form factors of heavy pseudoscalar mesons within a light-front constituent quark model

• Published in: Physics letters. B Vol. 385; no. 1; pp. 317 - 323
• Main Authors: Grach, I.L, Narodetskii, I.M, Simula, S
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 26-09-1996
• Subjects: Heavy mesons; Relativistic quark model; Semileptonic decays; 12.39.Ki; Relativistic quark model; 12.15.Hh; Heavy mesons; Semileptonic decays; 13.20.He; 13.20.Fc
• ISSN: 0370-2693; 1873-2445
• DOI: 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
q
interactions able to describe the meson mass spectra. It is shown that the decay rates of the
B →
Dℓ
ν
ℓ,
D →
Kℓ
ν
ℓ and
D →
πℓ
ν
ℓ weak decays are mainly governed by the effects of the confinement scale, whereas the
B →
πℓ
ν
ℓ 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.