Complete (O_7,O_8) contribution to B -> X_s gamma at order alpha_s^2
High Energy Physics - Phenomenology
2014-11-21 v1
Abstract
We calculate the set of O(alpha_s^2) corrections to the branching ratio and to the photon energy spectrum of the decay process B -> X_s gamma originating from the interference of diagrams involving the electromagnetic dipole operator O_7 with diagrams involving the chromomagnetic dipole operator O_8. The corrections evaluated here are one of the elements needed to complete the calculations of the B -> X_s gamma branching ratio at next-to-next-to-leading order in QCD. We conclude that this set of corrections does not change the central value of the Standard Model prediction for Br(B -> X_s gamma) by more than 1 %.
Keywords
Cite
@article{arxiv.1005.5587,
title = {Complete (O_7,O_8) contribution to B -> X_s gamma at order alpha_s^2},
author = {H. M. Asatrian and T. Ewerth and A. Ferroglia and C. Greub and G. Ossola},
journal= {arXiv preprint arXiv:1005.5587},
year = {2014}
}
Comments
19 pages, 8 figures