SemileptonicBq→Dq*lν(q=s,d,

Abstract

The form factors relevant to B q → D * q (J P = 1 − )ℓν (q = s, d, u) decays are calculated in the framework of the three point QCD sum rules approach. The heavy quark effective theory prediction of the form factors as well as 1/m b corrections to those form factors are obtained. A comparison of the results for the ratio of form factors at zero recoil limit and other values of q 2 with the predictions of the subleading Isgur-Wise form factor application for B → D * ℓν is presented. The total decay width and branching ratio for these decays are also evaluated using the q 2 dependencies of these form factors. The results are in good agreement with the constituent quark meson model and existing experimental data. The q = s case can also be detected at LHC in the near future.

Weak decays ofB¯smesons

“…It is worth to mention that our results for decays into orbitally excited final D s mesons are in rather good agreement with our previous results from [44], though in that work the potential model that have been used is much more sophisticated, even enabling the posibility to consider non-qq components for these orbitally excited states. Our results also compare well to the sum-rules calculation of [34,35], while the result of [36] is lower by about one half. The same happens if we compare with the results of [32] or [33].…”

“…In [33] the authors work out the form factors within the covariant light front quark model. Azizi et al in [34,35] and Blasi et al in [36] apply the sum rules technique to obtain the form factors and branching fractions. In [37], work within the Constituent Quark Model, as in this work.…”

“…Some of the decay modes of B s orB s mesons have been studied within the framework of relativistic constituent quark model [28,29], perturbative QCD [30,31], Bethe-Salpeter techniques [32], light front quark model [33], sum rules [34][35][36] or non relativistic constituent quark model [37] for instance. In this paper we study the semileptonic and nonleptonic decay ofB s in the context of nonrelativistic constituent quark model.…”

Relativistic description of weak decays of Bs mesons

“…[9,11], but slightly lower than the values of Refs. [13,14]. We find that the total branching fraction of the semileptonic decays of B s mesons to the ground state D ( * )…”

Study ofB¯s0→(Ds+,Ds*+<

“…The branching ratios of these decay modes have been studied, for example, in terms of the constituent quark meson (CQM) model [15], in the framework of the QCD sum rules (QCDSRs) [16] , in the light cone sum rules (LCSRs) or the covariant light-front quark model (CLFQM) [17,18]. In Ref.…”