Extracting |Vub| from the inclusive charmless semileptonic branching ratio of b hadrons
نویسندگان
چکیده
منابع مشابه
charmless 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 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 کاملMeasurement of the inclusive charmless semileptonic branching ratio of B mesons and determination of |V ub|.
We report a measurement of the inclusive charmless semileptonic branching fraction of B mesons in a sample of 89 x 10(6) (-)BB events recorded with the BABAR detector at the Upsilon(4S) resonance. Events are selected by fully reconstructing the decay of one B meson and identifying a charged lepton from the decay of the other B meson. The number of signal events is extracted from the mass distri...
متن کاملUOM/NPh/HQP/00-3 UH-511-962-00 Inclusive charmless semileptonic decay of Λb and Br(b → Xulνl)
We study the inclusive charmless semileptonic decay of Λb, Λb → Xulνl, in the framework of heavy quark expansion and find that the rate is substantially enhanced by spectator effect. We obtain Br(b → Xulνl) to be 1.13× 10 −3 for |Vub| = 3.3× 10 . We discuss our result in light of the recent LEP measurements of the charmless semileptonic branching ratio where such enhancement was not taken into ...
متن کاملON THE DETERMINATION OF |Vub| FROM INCLUSIVE SEMILEPTONIC B DECAYS
Precision tests of the CKM mechanism and searches for new physics in the flavour sector require dedicated QCD calculations of decay widths and spectra. Significant progress has been achieved in recent years in computing inclusive B decay spectra into light energetic partons. I briefly review different theoretical approaches to this problem focusing on the determination of |Vub| from inclusive s...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physics Letters B
سال: 1999
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(99)00034-9