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T: Fachverband Teilchenphysik

T 19: Flavourphysik (Theorie) 2

T 19.6: Vortrag

Montag, 4. März 2013, 18:05–18:20, WIL-B122

BR(B_s → µ⁺ µ⁻) to NNLO in QCD — •Thomas Hermann and Matthias Steinhauser — Institut für Theoretische Teilchenphysik, Karlsruher Institut für Technologie (KIT)

The recently measured rare decay B_s → µ⁺ µ⁻ is very sensitive to physics beyond the Standard Model (SM). Therefore, it is important to reduce the SM uncertainties. NNLO QCD corrections to this branching ratio reduce current uncertainties due to the dependence on the matching scale.
In this talk, we present the calculation of the Wilson coefficient C₁ to NNLO in QCD, which includes corrections to W-boson box and Z-boson penguin contributions. In particular, we provide details on the matching procedure and the calculation of the coefficient function of the evanescent operator.