Eur Phys J C (2004) 33: s277-s281
https://doi.org/10.1140/epjcd/s2003-03-203-1

PS02 Rare Decays

Review on the inclusive rare decays B → X _s γ and B → X _d γ in the Standard Model

Institut für Theoretische Physik, Universität Bern, CH-3012 Bern, Switzerland

Received: 17 October 2003
Accepted: 24 October 2003
Published online: 30 October 2003

Abstract

We review the NLL QCD calculations for the branching ratio of B → X _s γ in the SM. In particular, we emphasize the problem related to the definition of the charm quark mass which leads to a rather large uncertainty of the NLL predictions. The various steps needed for a NNLL calculation, in which the m _c issue can be settled, is also sketched. We briefly summarize the results of a calculation of the corrections to BR(B → X _s γ), which was recently performed as a first step in the NNLL program. We then also briefly review the status of the photon energy spectrum and show the comparison with experimental data. Finally, we review the status of the CKM suppressed decay mode B → X _d γ.