NNLO corrections to inclusive semileptonic B decays in the shape-function region

被引：46

作者：

Bell, Guido ^{[1
]}

机构：

[1] Univ Karlsruhe, Inst Theoret Teilchenphys, D-76128 Karlsruhe, Germany

来源：

NUCLEAR PHYSICS B | 2009年 / 812卷 / 1-2期

关键词：

MESON DECAYS; QCD FACTORIZATION; HARMONIC POLYLOGARITHMS; DIFFERENTIAL-EQUATIONS; PHOTON ENERGY; 2-LOOP RESULT; WILSON LOOPS; RENORMALIZATION; QUARK; DISTRIBUTIONS;

D O I：

10.1016/j.nuclphysb.2008.12.018

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 compute 2-loop QCD corrections to the hard coefficient functions which arise in the factorization formula for B -> X(u)l nu decays in the shape-function region. Our calculation provides the last missing piece required for a NNLO analysis of inclusive semileptonic B decays, which may significantly reduce the theoretical uncertainty in the extraction of the CKM matrix element vertical bar V(ub)broken vertical bar. Among the technical aspects, we find that the 2-loop hard coefficient functions are free of infrared singularities as predicted by the factorization framework. We perform a brief numerical analysis of the NNLO corrections and include a discussion on charm mass effects. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：264 / 289

页数：26

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