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T: Fachverband Teilchenphysik
T 19: Beyond the Standard Model (Theorie) IV
T 19.2: Talk
Friday, April 1, 2011, 14:15–14:30, 30.23: 6-1
Light Stop Decay in the MSSM with Minimal Flavor Violation — •Eva Popenda and Margarete Muhlleitner — ITP, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany
The framework of minimal flavor violation provides a suitable solution to the New Physics Flavor Puzzle: All flavor changing transitions are governed by the CKM matrix. In particular there are no FCNC processes at tree level.
Accordingly the flavor changing neutral current (FCNC) decay t̃1 → c + χ̃10 is forbidden at tree level in this framework and goes through one-loop diagrams with charged particles in the loops. For a light stop, when its decays to third generation squarks are kinematically closed, this is the leading decay mode. We present a complete calculation of this process at the one loop level in the MSSM characterized by MFV at a scale µMFV.
However, the MFV assumption holds only at the scale µMFV and is violated by radiative corrections, leading to FCNC transitions at a scale µ ≠ µMFV. These induced FCNC mixings follow from renormalization group equations (RGE) of the MSSM, which also take into account resummation effects. We investigate and compare the numerical impact of the results in the one-loop and the RGE approach.