Complete O(alpha_s^2) Corrections to Zero-Recoil Sum Rules for B-->D* Transitions
High Energy Physics - Phenomenology
2010-11-23 v1
Abstract
We present the complete O(alpha_s^2) corrections to the Wilson coefficient of the unit operator in the zero-recoil sum rule for the B-->D* transition. We include both perturbative and power-suppressed nonperturbative effects in a manner consistent with the operator product expansion. The impact of these corrections on |V_cb| extracted from semileptonic B-->D* decays near zero recoil is discussed. The mixing of the heavy quark kinetic operator with the unit operator at the two loop level is obtained. O(alpha_s) corrections to a number of power-suppressed operators are calculated.
Cite
@article{arxiv.hep-ph/9706311,
title = {Complete O(alpha_s^2) Corrections to Zero-Recoil Sum Rules for B-->D* Transitions},
author = {Andrzej Czarnecki and Kirill Melnikov and Nikolai Uraltsev},
journal= {arXiv preprint arXiv:hep-ph/9706311},
year = {2010}
}
Comments
13 pages, revtex