NNLL QCD contribution of the electromagnetic dipole operator to Γ ((B)over-bar → Xsγ)

被引：44

作者：

Asatrian, H. M.

Hovhannisyan, A.

Poghosyan, V.

Ewerth, T.

Greub, C.

Hurth, T. ^{[1
]}

机构：

[1] CERN, Dept Phys, Theory Unit, CH-1211 Geneva 23, Switzerland

[2] Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA

[3] Univ Bern, Inst Theoret Phys, CH-3012 Bern, Switzerland

[4] Yerevan Phys Inst, Yerevan 375036, Armenia

来源：

NUCLEAR PHYSICS B | 2006年 / 749卷 / 1-3期

关键词：

D O I：

10.1016/j.nuclphysb.2006.05.026

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 present an independent calculation of that part of the O(alpha(2)(s)) contribution to the decay width Gamma ((B) over bar -> X-s gamma) which arises from the self-interference term of the electromagnetic dipole operator O-7. Using a different method, we find complete agreement with a previous calculation. This NNLL contribution is an important ingredient for the complete NNLL prediction of Gamma((B) over bar -> X-s gamma) which will resolve the charm quark mass ambiguity appearing at NLL accuracy. (c) 2006 Published by Elsevier B.V.

引用

页码：325 / 337

页数：13

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