Göttingen 2012 – scientific programme
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T: Fachverband Teilchenphysik
T 19: Flavourphysik (Theorie) 2
T 19.6: Talk
Friday, March 2, 2012, 09:40–09:55, VG 3.102
Radiative Wilson Coefficients in Warped Extra Dimensions — •Christoph Schmell — Institut für Physik, Johannes Gutenberg-Universität Mainz
Flavor-changing neutral currents like B→ Xs γ occur in the Standard Model (SM) only at loop level and are thus strongly sensitive to new physics (NP). Concerning the above B decay, people are interested in the NP contributions to the radiative Wilson coefficients C7γ, C8g, C7γ, and C8g, since these ones play the most important role for all associated observables. One promising possibility for NP is the Randall-Sundrum (RS) model characterized by a five-dimensional space-time with a compact warped extra dimension. Among other things, this set-up leads to an infinite number of massive so-called Kaluza-Klein (KK) excitations of all SM particles. It turns out that the RS contributions to the above Wilson coefficients contain double sums over infinite towers of KK particles so that it is not a priori clear if the coefficients converge. In my talk, I will show the finiteness of all coefficients in the RS model and present the latter’s effects on some observables like the branching ratio, the CP asymmetry, and the photon polarization ratio.