The Q1,2-Q7 interference contributions to b → sγ at O(αs2) for the physical value of mc

被引：2

作者：

Czaja, M. ^{[1
]}

Czakon, M. ^{[2
]}

Huber, T. ^{[3
]}

Misiak, M. ^{[1
]}

Niggetiedt, M. ^{[4
]}

Rehman, A. ^{[5
,6
]}

Schoenwald, K. ^{[7
]}

Steinhauser, M. ^{[8
]}

机构：

[1] Warsaw Univ, Fac Phys, Inst Expt Phys, Pasteura 5, PL-02093 Warsaw, Poland

[2] Rhein Westfal TH Aachen, Inst Theoret Teilchenphys & Kosmol, D-52056 Aachen, Germany

[3] Univ Siegen, Ctr Particle Phys Siegen CPPS, Theoret Phys 1, D-57068 Siegen, Germany

[4] Max Planck Inst Phys & Astrophys, Fohringer Ring 6, D-80805 Munich, Germany

[5] Univ Alberta, Dept Phys, Edmonton, AB T6G 2E1, Canada

[6] Quaid i Azam Univ Campus, Natl Ctr Phys, Islamabad 45320, Pakistan

[7] Univ Zurich, Phys Inst, CH-8057 Zurich, Switzerland

[8] Karlsruhe Inst Technol KIT, Inst Theoret Teilchenphys, D-76128 Karlsruhe, Germany

来源：

EUROPEAN PHYSICAL JOURNAL C | 2023年 / 83卷 / 12期

基金：

加拿大自然科学与工程研究理事会; 欧洲研究理事会;

关键词：

D O I：

10.1140/epjc/s10052-023-12270-8

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：

The B -> X-s gamma branching ratio is currently measured with around 5% accuracy. Further improvement is expected from Belle II. To match such a precision on the theoretical side, evaluation of O(alpha(2)(s)) corrections to the partonic decay b -> X-s(part) gamma are necessary, which includes the b -> s gamma, b -> sg gamma, b -> sgg gamma, b -> sq (q) over bar gamma decay channels. Here, we evaluate the unrenormalized contribution to b -> s gamma that stems from the interference of the photonic dipole operator Q(7) and the current-current operators Q(1) and Q(2). Our results, obtained in the cut propagator approach at the 4-loop level, agree with those found in parallel by Fael et al. who have applied the amplitude approach at the 3-loop level. Partial results for the same quantities recently determined by Greub et al. agree with our findings, too.

引用

页数：6

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