Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-01-27
Phys.Atom.Nucl. 60 (1997) 1292-1304; Yad.Fiz. 60N8 (1997) 1429-1441
Physics
High Energy Physics
High Energy Physics - Phenomenology
27 pages, Latex, with 9 postscript figures; some different references and numbers in table 5. Thanks to P. Ball for comments
Scientific paper
An explicit relativistic light-front quark model is presented which gives the momentum transfer dependent form factors of weak hadronic currents among heavy pseudoscalar and vector mesons in the whole accessible kinematic region $ 0\leq q^2 \leq q^2_{max} $. For the numerical investigations of the $ B \to D^* l \nu_l $, $ B \to \rho l \nu_l $, $ D\to K^* l \nu_l $ and $ D \to \rho l \nu_l $ semileptonic decays the equal time wave functions corresponding to the updated version of the ISGW model are adopted. Using the available experimental information on branching fractions $ BR(B \to D^* l \nu_l) $ and $ BR(B \to \rho l \nu_l) $ the CKM parameters $ V_{cb} $ and $ V_{ub} $ were estimated: $ |V_{cb}| = 0.036 \pm 0.004 $, $ |V_{ub}| = 0.0033 \pm 0.0004 $. The model is further tested by comparison with experimental data, QCD sum rules and lattice calculations.
Demchuk N. B.
Kulikov Yu. P.
Narodetskii Ilya M.
O'Donnell Patrick J.
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