Constraining new physics contributions to the width difference in the B_s system

Wednesday, October 27th, 14:30hs - Seminar room

Speaker: Christian Bauer  (LBL, Berkeley)


The recent measurement of the di-muon asymmetry by the D0 collaboration is in excess of the SM prediction by 3.2 sigma. In this talk I will discuss the implementation of this measurement, and show that the central value is in violation with the SM prediction for the off-diagonal term in the decay matrix

(usually called Gamma_12) of B_s mesons, and can not be explained by a phase alone. I will then discuss experimental constraints from B decays on new physics contributions to the magnitude of Gamma_12, and argue that the new physics has to have very special properties to be allowed by these constraints.



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