Form factor relations for heavy-to-heavy and heavy-to-light meson transitions.
نویسنده
چکیده
Relations between the form factors that parametrize the hadronic matrix elements, in spectator decays of heavy mesons, have been derived by Stech within the constituent quark model. In here, we examine these relations using a slightly modified description of the meson states. We find new and very general relations for some of the form factors. For the other form factors, we obtain small modifications to the relations previously derived by Stech, in the case of heavy-to-light transitions. PACS: 13.20.He, 13.25.Hw, 13.25.Ft, 13.20.Fc.
منابع مشابه
Exact Relations for Heavy-Light Quark Systems
We derive general relations among hadronic form factors involving one heavy meson bq and another, not necessarily heavy, meson Qq. The relations are valid to all orders of mass corrections of mQ .
متن کاملA quark loop model for heavy mesons
I consider a model based on a quark–meson interaction Lagrangian. The transition amplitudes are evaluated by computing diagrams in which heavy and light mesons are attached to quark loops. The light chiral symmetry relations and the heavy quark spin-flavour symmetry dictated by the heavy quark effective theory are implemented. The model allows to compute the decay form factors and therefore can...
متن کاملForm factor relations for heavy-to-light meson transitions: tests of the Quark Model predictions
In the amplitudes for the weak semi-leptonic decays of mesons, the hadronic matrix elements are parametrized by form factors that describe the non-perturbative QCD effects and are a source of large theoretical uncertainties. In the case of heavy-to-light meson transitions, a Quark Model derivation leads to very general relations between those hadronic form factors, such that only two remain tha...
متن کاملSymmetry Relations for Heavy-to-light Meson Form Factors at Large Recoil *
The description of large-recoil heavy-to-light meson form factors is reviewed in the framework of soft-collinear effective theory. At leading power in the heavy-quark expansion, three classes of approximate symmetry relations arise. The relations are compared to experimental data for D → K * and Ds → φ form factors, and to light-cone QCD sum rule predictions for B → π and B → ρ form factors. Im...
متن کاملHeavy to Light Semileptonic Transitions in the Heavy Quark Effective Theory
The scaling behavior of semileptonic form-factors in Heavy to Light transitions is studied in the Heavy Quark Effective Theory. In the case ofH → πeν it is shown that the same scaling violations affecting the heavy meson decay constant will be present in the semileptonic form-factors.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Physical review. D, Particles and fields
دوره 54 11 شماره
صفحات -
تاریخ انتشار 1996