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Gravitational rescue of minimal gauge mediation
Gravity mediation supersymmetry breaking become comparable to gauge mediated
supersymmetry breaking contributions when messenger masses are close to the GUT
scale. By suitably tuning the gravity contributions one can then modify the
soft supersymmetry breaking sector to generate a large stop mixing parameter
and a light higgs mass of 125 GeV. In this kind of hybrid models, however the
nice features of gauge mediation like flavour conservation etc, are lost. To
preserve the nice features, gravitational contributions should become important
for lighter messenger masses and should be important only for certain fields.
This is possible when the hidden sector contains multiple (at least two)
spurions with hierarchical vaccum expectation values. In this case, the
gravitational contribtutions can be organised to be `just right'. We present a
complete model with two spurion hidden sector where the gravitational
contribution is from a warped flavour model in a Randall-Sundrum setting. Along
the way, we present simple expressions to handle renormalisation group
equations when supersymmetry is broken by two different sectors at two
different scales.Comment: 24 Pages, 3 figures, Detailed discussions on flavour violation
included, added figure and references, Matches published versio
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