Kinetic corrections to (B)over-bar→Xcl(ν)over-bar at one loop

被引：34
|
作者：
Becher, Thomas [1 ]
Boos, Heike [2 ]
Lunghi, Enrico
机构：
[1] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA
[2] Univ Siegen, Fachbereich Phys, D-57068 Siegen, Germany
来源：
JOURNAL OF HIGH ENERGY PHYSICS | 2007年 / 12期
关键词：
heavy quark physics; B-physics; quark masses and SM parameters; weak decays;
D O I：
10.1088/1126-6708/2007/12/062
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We evaluate the one-loop corrections to the Wilson coefficient of the kinetic operator in the operator product expansion of the differential B -> X(c)l (nu) over bar decay rate. With a moderate cut on the lepton energy, the one-loop terms change the kinetic operator contributions to spectral moments by about 20%. This amounts to a small correction for leptonic and hadronic moments, except for those which vanish at the lowest order, where the effect can be sizable. Together with a two-loop calculation of the leading-power rate and an evaluation of the one-loop corrections to the Wilson coefficient of the chromo-magnetic operator, our results will allow for a high-precision determination of vertical bar V-cb vertical bar and the b- and c-quark masses.
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页数：19
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