Magnetic dipole operator contributions to the photon energy spectrum in B¯→Xsγ at O(αs2)

2006/07/28 by H. M. Asatrian, T. Ewerth, A. Ferroglia +4 · 3 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1016/j.nuclphysb.2006.11.002

published as Nucl.Phys.B762:212-228,2007 · 18 pages, uses axodraw.sty

arxiv created 2006/07/28 · openalex publication_date 2006/11/17 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We compute the O(α_s²) contributions to the photon energy spectrum of the inclusive decay B -> X_s γassociated with the magnetic penguin operator O₇. They are an essential part of the ongoing NNLO calculation of this important decay. We use two different methods to evaluate the master integrals, one based on the differential equation approach and the other on sector decomposition, leading to identical results which in turn agree with those of a recent independent calculation by Melnikov and Mitov. We study the numerical relevance of this set of NNLO contributions in the photon energy spectrum and discuss the change of bottom quark mass scheme.

Citations

• Fermionic next-to-next-to leading logarithmic corrections tob→sγ
• New features of FORM

Cited by

• B¯→Xsγin two universal extra dimensions
• Charm quark mass dependence of the electromagnetic dipole operator contribution to B¯→Xsγ at O(αs2)
• Bound on minimal universal extra dimensions fromB¯→Xsγ