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T: Fachverband Teilchenphysik
T 18: Flavourphysik (Theorie) 1
T 18.6: Talk
Thursday, March 1, 2012, 18:00–18:15, VG 3.102
NNLO corrections to B→ Xs γ for mc = 0 — Michal Czakon1, Mikolaj Misiak2, •Paul Fiedler1, Tobias Huber3, and Thomas Schutzmeier4 — 1Institut fuer Theoretische Teilchenphysik und Kosmologie, RWTH Aachen, Deutschland — 2Institute of Physics, University of Warsaw, Poland — 3Fachbereich fuer Physik, Universitaet Siegen, Deutschland — 4Physics Department, Florida State University, USA
An important step towards a full Standard Model description of the inclusive B→ Xs γ decay at next-to-next-to-leading order in the strong coupling is the evaluation of the missing contributions to the interference of the 4-quark operator P2 and the dipole operator P7. We present the complete result of the virtual and real corrections to this particular interference in the limit of vanishing charm quark mass. Our findings can be used to fix the boundary for the mc interpolation and thus help to significantly reduce the error of the Standard Model prediction for Br(B→ Xs γ).