|Vcb| from semileptonic B decays with two-loop QCD accuracy

نویسندگان

  • Andrzej Czarnecki
  • Kirill Melnikov
چکیده

Recent progress in calculating O(αs) corrections to inclusive and exclusive semileptonic b → c transitions is reviewed. The impact of these corrections on the |Vcb| determination from both inclusive and exclusive B decays is discussed.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

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 کامل

|Vcb| from inclusive semileptonic B decays

We determine |Vcb| from inclusive semileptonic B decays including resummation of supposedly large perturbative corrections, which originate from the running of the strong coupling. We argue that the low value of the BLM scale found previously for inclusive decays is a manifestation of the renormalon divergence of the perturbative series starting already in third order. A reliable determination ...

متن کامل

Work supported in part by US Department of Energy contract DE-AC02-76SF00515. SEMILEPTONIC B-MESON DECAYS

The study of the semileptonic B-meson decays is the most accessible and cleanest way to determine the CKM matrix elements |Vcb| and Vub. These decays also provide experimental access to study the QCD form-factors, heavy quark masses, and HQE parameters. The theoretical description of semileptonic B-meson decays at the parton level is very simple because there is no interaction between leptonic ...

متن کامل

|Vub| Determinations from Inclusive Semileptonic B Decays

|Vcb| and |Vub| are two of the fundamental constants of the Standard Model. They need to be determined by experimental measurements. These can be done with leptonic, semileptonic, or nonleptonic decays of B mesons. In this talk I will discuss the determinations of |Vcb| and |Vub| from inclusive semileptonic B decays. An observable in these processes is schematically related to |Vcb| or |Vub| in...

متن کامل

Two-loop QCD corrections to semileptonic b decays at an intermediate recoil

We present complete O(αs) corrections to the decay b → clνl at the point where the invariant mass of the leptons √ q2 equals the c quark mass. We use this result, together with previously obtained corrections at the ends of the q2 spectrum, to estimate the total width of the semileptonic b → c decay with O(αs) accuracy, essential for the |Vcb| determination. Precise determination of the Cabibbo...

متن کامل

ذخیره 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 1997