Abstract
Abstract A Standard Model-like Higgs near 125 GeV in the MSSM requires multi-TeV stop masses, or a near-maximal contribution to its mass from stop mixing. We investigate the maximal mixing scenario, and in particular its prospects for being realized it in potentially realistic GUT models. We work out constraints on the possible GUT-scale soft terms, which we compare with what can be obtained from some well-known mechanisms of SUSY breaking mediation. Finally, we analyze two promising scenarios in detail, namely gaugino mediation and gravity mediation with non-universal Higgs masses.
Highlights
TeV scale.2 In this approach, the soft terms can be chosen by hand to yield maximal mixing
We work out constraints on the possible GUT-scale soft terms, which we compare with what can be obtained from some well-known mechanisms of SUSY breaking mediation
One should keep in mind one of the key motivations for low-energy supersymmetry: The supersymmetric Standard Model can naturally be extrapolated up to a very high fundamental scale
Summary
We follow the sign conventions of [32] for soft terms, in which the MSSM superpotential is. Are generic in situations with maximal mixing, if the scalar masses are unified or negligible This is understood in the light of the large coefficients of the A0 terms in eqs. Maximal mixing in a GUT-scale model with unified gaugino masses at tan β 5 requires large negative A0 ≈ −(1– 3) max M1/2, mQ3, mU3. This is a non-trivial requirement on any GUT-scale model. It is beneficial but not strictly necessary for maximal mixing if there are positive up-type Higgs soft masses m2Hu, and small third-generation soft masses m2U3, m2Q3, as compared to the gaugino mass.
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