Natural flavour mixing in the MSSM and μ−−>e,γ
Abstract
In the absence of any additional assumption it is natural to conjecture that sizeable flavour-mixing mass entries,
Δ
m
2
, may appear in the mass matrices of the scalars of the MSSM, i.e.
Δ
m
2
∼O(
m
2
)
. This flavour violation can still be reconciled with the experiment if the gaugino mass,
M
1/2
, is large enough to yield (through the renormalization group running) a sufficiently small
Δ
m
2
/
m
2
at low energy. This leads to a gaugino dominance framework (i.e.
M
2
1/2
≫
m
2
), which permits a remarkably model--independent analysis. We study this possibility focussing our attention on the
μ→e,γ
decay. In this way we obtain very strong and general constraints, in particular $\frac{M_{1/2}^2}{\Delta m} \simgt 34\ {\rm TeV}$.