Semileptonic B decays to excited charmed mesons
- California Institute of Technology, Pasadena, California 91125 (United States)
Exclusive semileptonic B decays into excited charmed mesons are investigated at order {Lambda}{sub QCD}/m{sub Q} in the heavy quark effective theory. Differential decay rates for each helicity state of the four lightest excited D mesons (D{sub 1}, D{sub 2}{sup {asterisk}}, D{sub 0}{sup {asterisk}}, and D{sub 1}{sup {asterisk}}) are examined. At zero recoil, {Lambda}{sub QCD}/m{sub Q} corrections to the matrix elements of the weak currents can be written in terms of the leading Isgur-Wise functions for the corresponding transition and meson mass splittings. A model independent prediction is found for the slope parameter of the decay rate into helicity zero D{sub 1} at zero recoil. The differential decay rates are predicted, including {Lambda}{sub QCD}/m{sub Q} corrections with some model dependence away from zero recoil and including order {alpha}{sub s} corrections. Ratios of various exclusive branching ratios are computed. Matrix elements of the weak currents between B mesons and other excited charmed mesons are discussed at zero recoil to order {Lambda}{sub QCD}/m{sub Q}. These amplitudes vanish at leading order, and can be written at order {Lambda}{sub QCD}/m{sub Q} in terms of local matrix elements. Applications to B decay sum rules and factorization are presented. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 566115
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 1 Vol. 57; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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