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T: Fachverband Teilchenphysik

T 15: Flavourphysik (Theorie) I

T 15.7: Vortrag

Mittwoch, 17. März 2010, 15:30–15:45, HG XIII

Uncertainties in the B→ X_sγ Decay due to Subleading Power Corrections — •Michael Benzke¹, Seung J. Lee², Matthias Neubert¹, and Gil Paz³ — ¹Johannes Gutenberg-Universität, Mainz — ²Weizmann Institute of Science, Rehovot, Israel — ³University of Chicago, Chicago, U.S.A.

The rare decay B→ X_sγ is of interest, since it can be used to probe the standard model and constrain possible new physics scenarios. For this it is necessary to theoretically predict the decay rate as precisely as possible and to reliably estimate the uncertainties. Today, the major source of uncertainty is of a non-perturbative nature and originates from the low energy strong interactions within the hadron. It can be systematically dealt with within the framework of SCET. In this talk I will present our estimate on the non-perturbative uncertainties based on an SCET analysis at subleading power.