منابع مشابه
Calculation of exclusive decay modes of the tau.
a~We update the calculation of the decays of the T lepton into various modes using recent data on electron-positron annihilation into .hadrons plus bounds that follow from isotopic spin conservation. Comparison is made with exclusive branching ratio data and inclusive charged prong distribution measurements in T decays and the difficulty in accounting for all the one charged-prong decays as a s...
متن کاملThe Exclusive Decay B → ρeν Beyond Model Calculations
Due to its comparatively theoretical “simplicity”, the decay channel B → ρeν offers one of the best possibilities to determine the CKM matrix element |Vub| accurately. I present a new calculation of the relevant hadronic form factors from light-cone sum rules. I also review the results from lattice calculations and find that they agree with the results from light-cone sum rules where comparison...
متن کاملA Systematic Analysis of the Exclusive B → K∗`+`− Decay
A model–independent analysis for the exclusive, rare B → K∗`+`− decay is presented. Systematically studied are the experimentally measured quantities, such as, branching ratio, forward–backward asymmetry, longitudinal polarization of the final leptons, and the ratio ΓL/ΓT of the decay widths when K∗ meson is longitudinally and transversally polarized. The dependence of the asymmetry parameter α...
متن کاملExclusive Λb → Λl+l− decay beyond standard model
Using the most general, model independent form of the effective Hamiltonian, the exclusive, rare baryonic Λb → Λll (l = μ, τ) decay is analyzed. We study sensitivity of the branching ratio and lepton forward–backward asymmetry to the new Wilson coefficients. Is is shown that these physical quantities are quite sensitive to the new Wilson coefficients. Determination of the position of zero value...
متن کاملExclusive Decay Amplitudes from Light-Cone Sum Rules
We review recent developments in QCD sum rule applications to semileptonic B → π and D → π transitions. INTRODUCTION The ongoing experiments at the B factories allow measurements of B decays and CP violation with greatly improved precision (see e.g. [1]) which should be matched also on the theoretical side. The most difficult obstacle are the longdistance QCD effects playing an important, somet...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2013
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.87.094004