Aug 23 – 28, 2010
Bonn
Europe/Berlin timezone

New constraints on the flavour structure of left-handed squarks

Aug 27, 2010, 2:17 PM
15m
Wolfgang-Paul-HS (Bonn)

Wolfgang-Paul-HS

Bonn

Nussallee 12

Speaker

Mr Momchil Davidkov (Institute for Theoretical Particle Physics, Karlsruhe Institute of Technology)

Description

In the light of recent experimental anomalies indicating a non-zero Bs-Bs-bar mixing phase I present a fresh look at meson-antimeson mixing in the MSSM. I present a new analysis of the up-type and down-type squark mass matrices with focus on constraints on the mass splittings among the first two generations of left-handed squarks. If the gluino is heavier than the squarks, the conventionally studied squark-gluino box contributions are small and can even vanish. This has two important consequences: First, the mass splittings between squarks of different generations can become large because of a suppressed super-GIM mechanism. Second, the SU(2) symmetry linking the chargino contributions in Bd mixing and Bs mixing leads to correlations between both meson-antimeson systems. I exemplify this correlation in a detailed numerical study (which also includes b->s gamma and Kaon CP violation) for a scenario with flavour-changing left-left elements of the squark mass matrix. I further have a critical look at D mixing.

Primary author

Mr Momchil Davidkov (Institute for Theoretical Particle Physics, Karlsruhe Institute of Technology)

Co-authors

Mr Andreas Crivellin (Institute for Theoretical Particle Physics, Karlsruhe Institute of Technology) Prof. Ulrich Nierste (Institute for Theoretical Particle Physics, Karlsruhe Institute of Technology)

Presentation materials