Speaker
Martin Gorbahn
(Liverpool University)
Description
The B_q to mu^+ mu^- theory prediction is sensitive to the
renormalisation scheme used for sin_W. The scheme ambiguity is the
source of the dominant theory uncertainty in the standard
model. Additionally the renormalization is rather involved in new physics models
where M_Z cos_W = M_W does not hold at tree level. In this talk I will
present the results of a two-loop electroweak calculation which lifts
the scheme ambiguities of the standard model and give an updated
theory prediction for this decay. I will also discuss the necessary one-loop
renormalisation for a generic class of spontaneously broken gauge
theories.
Author
Martin Gorbahn
(Liverpool University)
