Semileptonic B → a1lν decay in QCD
نویسنده
چکیده
The form factors and the branching ratio of the B → a1lν decay are calculated in framework of QCD sum rules. A comparison of our results on form factors and branching ratio with the results from constituent quark model is presented. e-mail: [email protected] e-mail: [email protected]
منابع مشابه
A Quark-Meson Model for Heavy Mesons: Semi-Leptonic Decays
I consider a model for heavy meson decays based on an effective quark-meson Lagrangian. The model is constrained by the known symmetries of QCD in the mQ → ∞ limit for the heavy quarks, and chiral symmetry in the light quark sector. Using a limited number of free parameters it is possible to compute several phenomenological quantities, e.g. the leptonic B and B∗∗ decay constants; the Isgur-Wise...
متن کاملcharmless semileptonic branching ratio of b hadrons
We calculate the inclusive charmless semileptonic decay width of the B meson using a QCD-based approach. This approach is able to account for both dynamic and kinematic effects of nonperturbative QCD. The charmless semileptonic decay width is found to be enhanced by long-distance strong interactions by +(7± 5)% with respect to the free quark decay width. Using the resulting theoretical value fo...
متن کاملCombination of Colour Favoured and Colour
In this research we described the effective Hamiltonian theory and applied this theory to the calculation of current-current (Q1,2) and QCD penguin (Q3,…,6) c quark decay rates. We calculated the decay rates of semileptonic and hadronic of charm quark in the effective Hamiltonian theory. We investigated the decay rates of D meson decays according to Spectator Quark Model (SQM) for the calculati...
متن کاملMatrix Elements and the Determination of the Weak Mixing Angles
The main goal of this talk is to review a new method’ for predicting, from QCD, the weak matrix elements that are needed to describe the semileptonic decays; B -+ DePe,,B + D’ec, and Ab + A,eti,. The method also relates B + pe& semileptonic decay to D + pZuc semileptonic decay. Since these are exclusive decays involving hadronic states nonperturbative strong interaction physics plays a role. Th...
متن کاملNonperturbative Qcd Contributions to the Semileptonic Decay Width of the B Meson
Nonperturbative QCD contributions to the inclusive semileptonic decay of the B meson consist of the dynamic and kinematic components. We calculate the decay width in an approach based on the light-cone expansion and the heavy quark effective theory, which is able to include both components of nonperturbative QCD contributions in an almost model-independent way. The kinematic component results i...
متن کامل