تقرير
The Q_{1,2}-Q_7 interference contributions to b -> s gamma at O(alpha_s^2) for the physical value of m_c
| العنوان: | The Q_{1,2}-Q_7 interference contributions to b -> s gamma at O(alpha_s^2) for the physical value of m_c |
|---|---|
| المؤلفون: | Czaja, M., Czakon, M., Huber, T., Misiak, M., Niggetiedt, M., Rehman, A., Schönwald, K., Steinhauser, M. |
| المصدر: | European Physical Journal C 83 (2023) 1108 |
| سنة النشر: | 2023 |
| المجموعة: | High Energy Physics - Phenomenology |
| مصطلحات موضوعية: | High Energy Physics - Phenomenology |
| الوصف: | 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_s^2) corrections to the partonic decay b -> X_s^part gamma are necessary, which includes the b -> s gamma, b -> s g gamma, b -> s g g gamma, b -> s qbar q 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. Comment: published version, 9 pages, 1 figure |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1140/epjc/s10052-023-12270-8 |
| URL الوصول: | http://arxiv.org/abs/2309.14707 |
| رقم الأكسشن: | edsarx.2309.14707 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1140/epjc/s10052-023-12270-8 |
|---|