Complete Michel Parameter Analysis of the Inclusive Semileptonic b → c Transition
نویسندگان
چکیده
We perform a complete “Michel parameter” analysis of all possible helicity structures which can appear in the process B → Xc l ν̄l. We take into account the full set of operators parametrizing the effective Hamiltonian and include the complete one-loop QCD corrections as well as the non-perturbative contributions. The moments of the leptonic energy as well as the combined moments of the hadronic energy and hadronic invariant mass are calculated including the non-standard contributions.
منابع مشابه
Two-loop QCD corrections to semileptonic b decays at maximal recoil
We present a complete O(αs) correction to the differential width of the inclusive semileptonic decay b → clνl at the kinematical point of vanishing invariant mass of the leptons, q2 = 0. Together with the recently computed O(αs) correction at the upper boundary of the lepton invariant mass spectrum, this new information permits an estimate of the O(αs) effect in the total inclusive semileptonic...
متن کاملDetermination of HQET parameter λ1 from Inclusive Semileptonic B Meson Decay Spectrum
We estimate the heavy quark effective theory parameter λ1 from inclusive semileptonic B-meson decay spectrum. By using recent CLEO double lepton tagging data of B → Xeν, which shows the lepton momentum as low as 0.6 GeV, we extracted λ1 ∼ −0.58 GeV. We also derived Λ ∼ 0.46 GeV and |Vcb| = 0.041 ± 0.002. [email protected] [email protected], http://phya.yonsei.ac.kr/ ̃cskim/
متن کاملHadronic Decays of B Mesons
We review recent experimental results on hadronic decays and lifetimes of hadrons containing b and c quarks[1]. We discuss charm counting and the semileptonic branching fraction in B decays, the color suppressed amplitude in B decay, and the search for gluonic penguins in B decay. A complete picture of inclusive B decay is beginning to emerge from recent measurements by CLEO II and the LEP expe...
متن کاملPadé - Improved Estimate of Perturbative Contributions to Inclusive Semileptonic
Padé-approximant methods are used to estimate the three-loop perturbative contributions to the inclusive semileptonic b → u decay rate. These improved estimates of the decay rate reduce the theoretical uncertainty in the extraction of the CKM matrix element |V ub | from the measured inclusive semileptonic branching ratio. In this paper we briefly review the development of Padé approximation tec...
متن کاملTesting the left - handedness of the b → c transition
We analyse the spin structure of inclusive semileptonic b → c transitions and the effects of non-standard model couplings on the rates and the spectra. The calculation includes the O(α s) corrections as well as the leading non-perturbative ones.
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:
دوره شماره
صفحات -
تاریخ انتشار 2009