Two-loop matrix element of the current-current operator in the decay B → XSγ

被引：54

作者：

Buras, AJ ^{[1
]}

Czarnecki, A

Misiak, M

Urban, J

机构：

[1] Tech Univ Munich, Dept Phys, D-85748 Garching, Germany

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

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

来源：

NUCLEAR PHYSICS B | 2001年 / 611卷 / 1-3期

基金：

加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1016/S0550-3213(01)00336-4

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 important two-loop matrix element (S gamma \Q(2)\b) of the operator ((c) over bar gamma (mu)P(L)b)((s)over bar gamma muPLB) contributing to the inclusive radiative decay B --> X(s)gamma. The calculation is performed in the NDR scheme, by means of asymptotic expansions method. The result is given as a series in z equivalent to m(c)(2)/m(b)(2) up to O(z(6)). We confirm the result of Greub. Hurth and Wyler obtained by a different method up to O(z(3)). Higher-order terms are found to be numerically insignificant. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：488 / 502

页数：15

共 53 条

[1] EFFECTIVE LAGRANGIAN FOR B[-S PROCESSES WITH QCD-CORRECTIONS [J].

ADEL, K ;

YAO, YP .

MODERN PHYSICS LETTERS A, 1993, 8 (18) :1679-1690

[2] O(ALPHA(S)) CALCULATION OF THE DECAYS B-]S+GAMMA AND B-]S+G [J].

ADEL, K ;

YAO, YP .

PHYSICAL REVIEW D, 1994, 49 (09) :4945-4948

[3] INCLUSIVE PHOTON ENERGY-SPECTRUM IN RARE B DECAYS [J].

ALI, A ;

GREUB, C .

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 1991, 49 (03) :431-438

[4] A PROFILE OF THE FINAL-STATES IN B-]XS+GAMMA AND AN ESTIMATE OF THE BRANCHING RATIO BR(B-]K-STAR+GAMMA) [J].

ALI, A ;

GREUB, C .

PHYSICS LETTERS B, 1991, 259 (1-2) :182-190

[5] A DETERMINATION OF THE CKM-MATRIX ELEMENT RATIO VERTICAL-BAR-V(TS)VERTICAL-BAR/VERTICAL-BAR-V(CB)VERTICAL-BAR FROM THE RARE B-DECAYS B-]K-ASTERISK+GAMMA AND B-]X(S)+GAMMA [J].

ALI, A ;

GREUB, C .

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 1993, 60 (03) :433-442

[6] PHOTON ENERGY-SPECTRUM IN B-]X(S)+GAMMA AND COMPARISON WITH DATA [J].

ALI, A ;

GREUB, C .

PHYSICS LETTERS B, 1995, 361 (1-4) :146-154

[7] QCD NON-LEADING CORRECTIONS TO WEAK DECAYS AS AN APPLICATION OF REGULARIZATION BY DIMENSIONAL REDUCTION [J].

ALTARELLI, G ;

CURCI, G ;

MARTINELLI, G ;

PETRARCA, S .

NUCLEAR PHYSICS B, 1981, 187 (03) :461-513

[8] The O(αem/αs) correction to BR[B → Xsγ] [J].

Baranowski, K ;

Misiak, M .

PHYSICS LETTERS B, 2000, 483 (04) :410-416

[9] QCD ENHANCEMENT OF RADIATIVE B-DECAYS [J].

BERTOLINI, S ;

BORZUMATI, F ;

MASIERO, A .

PHYSICAL REVIEW LETTERS, 1987, 59 (02) :180-182

[10] Photonic penguins at two loops and mt-dependence of BR[B → Xs l+l-] [J].

Bobeth, C ;

Misiak, M ;

Urban, J .

NUCLEAR PHYSICS B, 2000, 574 (1-2) :291-330

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