Semileptonic B decays to excited charmed mesons

被引:135
作者
Leibovich, AK [1 ]
Ligeti, Z [1 ]
Stewart, IW [1 ]
Wise, MB [1 ]
机构
[1] CALTECH, Pasadena, CA 91125 USA
来源
PHYSICAL REVIEW D | 1998年 / 57卷 / 01期
关键词
D O I
10.1103/PhysRevD.57.308
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Exclusive semileptonic B decays into excited charmed mesons are investigated at order Lambda(QCD)/m(Q) in the heavy quark effective theory. Differential decay rates for each helicity state of the four lightest excited D mesons (D-1, D-2*, D-0*, and D-1*) are examined. At zero recoil, Lambda(QCD)/m(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-1 at zero recoil. The differential decay rates are predicted, including Lambda(QCD)/m(Q) corrections with some model dependence away from zero recoil and including order alpha(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(QCD)/m(Q). These amplitudes vanish at leading order, and can be written at order Lambda(QCD)/m(Q) in terms of local matrix elements. Applications to B decay sum rules and factorization are presented. [S0556-2821(98)02901-4].
引用
收藏
页码:308 / 330
页数:23
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