Estimate of B((B)over-bar→Xsγ) at O(αs2)

被引：613

作者：

Misiak, M.

Asatrian, H. M.

Bieri, K.

Czakon, M.

Czarnecki, A.

Ewerth, T.

Ferroglia, A.

Gambino, P.

Gorbahn, M.

Greub, C.

Haisch, U.

Hovhannisyan, A.

Hurth, T.

Mitov, A.

Poghosyan, V.

Slusarczyk, M.

Steinhauser, M.

机构：

[1] Univ Warsaw, Inst Theoret Phys, PL-00681 Warsaw, Poland

[2] CERN, Div Theoret Phys, CH-1211 Geneva 23, Switzerland

[3] Yerevan Phys Inst, Yerevan 375036, Armenia

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

[5] Univ Wurzburg, Inst Theoret Phys & Astrophys, D-97074 Wurzburg, Germany

[6] Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada

[7] Univ Freiburg, Inst Phys, D-79104 Freiburg, Germany

[8] Univ Turin, Dipartimento Fis Teor, I-10125 Turin, Italy

[9] Ist Nazl Fis Nucl, I-10125 Turin, Italy

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

[11] Univ Zurich, Inst Theoret Phys, CH-8057 Zurich, Switzerland

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

[13] DESY, Deutsches Elekt Synchrotron, D-15738 Zeuthen, Germany

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.98.022002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Combining our results for various O(alpha(2)(s)) corrections to the weak radiative B-meson decay, we are able to present the first estimate of the branching ratio at the next-to-next-to-leading order in QCD. We find B((B) over bar -> X-s gamma) = (3.15 +/- 0.23) x 10(-4) for E-gamma > 1.6 GeV in the (B) over bar -meson rest frame. The four types of uncertainties: nonperturbative (5%), parametric (3%), higher-order (3%), and m(c)-interpolation ambiguity (3%) have been added in quadrature to obtain the total error.

引用

页数：4

共 34 条

[11] Toward a NNLO calculation of the (B)over-bar → Xsγ decay rate with a cut on photon energy:: II.: Two-loop result for the jet function [J].