Speaker
Mr
Andrew Box
(University of Hawaii)
Description
In a wide class of supersymmetric models, the soft SUSY breaking parameters are determined by high scale
physics. Using an appropriate high scale ansatz, weak scale SUSY couplings relevant for phenomenology can then
be theoretically calculated using renormalization group (RG) methods. This procedure also allows us to obtain
predictions for the flavour structure of the theory. To accurately obtain the RG prediction at the two loop level,
effects of thresholds at one loop must be incorporated. These include the decoupling of heavy particles and the
concomitant splitting between couplings that are equal in the SUSY limit (the gauge and gaugino couplings, for
instance). The threshold effects can filter back into the overall running, and both the decoupling and the splitting
must therefore be considered if true two loop level accuracy is to be obtained. We describe a method that allows
the calculation of all soft supersymmetry breaking parameters. A program (to be incorporated into ISAJET) has
been developed, which includes flavour violating couplings of superparticles based on an arbitrary framework for
the high scale flavour structure. The weak scale flavour structure derived in this way can be applied to the study
of SUSY flavour changing decays. As an illustration, we recalculate the branching ratio of the flavour-violating
decay of the top squark.
Author
Mr
Andrew Box
(University of Hawaii)
