RGE Behaviour of SUSY with a U(2)^3 symmetry

Abstract

The first LHC results seem to disfavour, from the point of view of naturalness, any constrained MSSM realization with universal conditions at the SUSY-breaking scale. A more motivated scenario is given by split-family SUSY, in which the first two generations of squarks are heavy, compatible with a U(2)^3 flavour symmetry. We consider this flavour symmetry to be broken at a very high scale and study the consequences at low energies through its RGE evolution. Initial conditions compatible with a split scenario are found, and the preservation of correlations from minimal U(2)^3 breaking are checked. The various chiral operators in $\Delta F=2$ processes are analyzed, and we show that, due to LHC gluino bounds, the (LL)(RR) operators can not always be neglected. Finally, we also study a possible extension of the U(2)^3 model compatible with the lepton sector.

22 pages, 9 Figures; v2: minor corrections, improved discussion on (LL)(RR) operators, main results unchanged

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Cited by in corpus (4)

• Single-Scale Natural SUSY
• Flavour physics and flavour symmetries after the first LHC phase
• Split-Family SUSY, U(2)^5 Flavour Symmetry and Neutrino Physics
• RGE behaviour of U(2)^3 symmetry in SUSY