Theoretical update of the semileptonic branching ratio of B mesons
نویسندگان
چکیده
منابع مشابه
Theoretical Update of the Semileptonic Branching Ratio of B Mesons
We reconsider the prediction of the semileptonic branching ratio of B mesons, using the recent calculation [1] of the radiative corrections with account for finite quark masses in nonleptonic decays and taking into account 1/mb corrections. For the semileptonic branching ratio we obtain BSL = (11.8±1.6)% using pole quark masses and BSL = (11.0± 1.9)% using running MS quark masses. The uncertain...
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We calculate the radiative corrections to the nonleptonic inclusive B decay mode b → cud taking into account the charm quark mass. The corrections increase the decay rate by (4–8)%, depending on the renormalization point. Using these results, we obtain an improved theoretical prediction for the semileptonic branching ratio of B mesons. This talk relies on work done in collaboration with E. Baga...
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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 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 کاملSemileptonic Branching Fractions of Charged and Neutral B Mesons.
An examination of leptons in Υ(4S) events tagged by reconstructed B decays yields semileptonic branching fractions of b− = (10.1 ± 1.8 ± 1.4)% for charged and b0 = (10.9 ± 0.7 ± 1.1)% for neutral B mesons. This is the first measurement for charged B. Assuming equality of the charged and neutral semileptonic widths, the ratio b−/b0 = 0.93 ± 0.18 ± 0.12 is equivalent to the ratio of lifetimes.
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1995
ISSN: 0370-2693
DOI: 10.1016/0370-2693(94)01410-e