München 2009 – scientific programme

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T: Fachverband Teilchenphysik

T 15: Flavorphysik (Theorie) 2

T 15.4: Talk

Wednesday, March 11, 2009, 17:30–17:45, M001

Flavour-changing neutral currents in the flavour-blind MSSM at large tanβ — Lars Hofer, Ulrich Nierste, and •Dominik Scherer — Institut f. Theoretische Teilchenphysik, Universität Karlsruhe

A popular way to avoid too large FCNC in supersymmetric models is the assumption of minimal flavour violation (MFV), where SUSY is broken by a flavour-blind mechanism. We study how loop effects which are enhanced at large tanβ can circumvent the MFV constraint to generate new FCNCs. We show that these effects can be resummed to all orders in perturbation theory in analogy to the tanβ-enhanced corrections to the bottom mass.

This procedure yields new Feynman rules which automatically contain the enhanced effects without resorting to the decoupling limit. We also include the enhanced bottom-mass corrections and clarify their dependence on the input scheme. Finally, we study contributions to FCNC observables in B physics resulting from the new Feynman rules.