Shape functions from (B)over-bar→Xcl(v)over-barl -: art. no. 036003

被引：9
|
作者：
Boos, H [1 ]
Feldmann, T [1 ]
Mannel, T [1 ]
Pecjak, BD [1 ]
机构：
[1] Univ Siegen, Fachbereich Phys, D-57068 Siegen, Germany
来源：
PHYSICAL REVIEW D | 2006年 / 73卷 / 03期
关键词：
D O I：
10.1103/PhysRevD.73.036003
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We study inclusive semileptonic B -> X(c)l nu(l) decay using the power counting m(c) similar to root Lambda(QCD)m(b). Assuming this scaling for the charm-quark mass, the decay kinematics can be chosen to access the shape-function region even in b -> c transitions. To apply effective field theory methods in this region we extend soft-collinear effective theory to describe massive collinear quarks. We calculate the tree-level decay rate, including O(Lambda(QCD)/m(b)) power corrections, and show that it factorizes into a convolution of jet and shape functions. We identify a certain kinematical variable whose decay spectrum is proportional to the universal leading-order shape function familiar from b -> u decay, and speculate as to whether information about this shape function can be extracted from data on b -> c decay.
引用
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页数：10
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