MSSM without free parameters

It is often argued that the minimal supersymmetric standard model has O(100) free parameters, and the generic parameter region is already excluded by the null observation of the flavor and CP-violating processes as well as the constraints from the LHC experiments. This situation naturally leads us to consider the case where all the dangerous soft supersymmetry breaking terms, such as the scalar masses and scalar couplings, are absent, while only the unified gaugino mass term and the μ term are nonvanishing at the grand unification scale. We revisit this simple situation taking into account the observed Higgs boson mass, 125 GeV. Since the gaugino mass and the μ term are fixed in order to explain the Higgs boson and the Z boson masses, there is no free parameter left in this scenario. We find that there are three independent parameter sets that exist including ones which have not been discussed in the literature. We also find that the abundance of the dark matter can be explained by relic gravitinos which are nonthermally produced as decay products of the supersymmetry particles while satisfying constraints from big bang nucleosynthesis. We discuss the effects of the gravity mediation which generically gives a contribution to the soft terms of the order of the gravitino mass. It turns out that a newly found parameter set is preferable to explain the Higgs boson mass as well as the gravitino dark matter while satisfying the constraints from the electric dipole moments of the electron and the nucleon.

Note:

23 pages, 8 figures, 1 table

new physics
supersymmetry: symmetry breaking
mediation: gravitation
minimal supersymmetric standard model
mu-problem
Higgsino: mass
gaugino: mass
mass: scale
scale: grand unified theory
Higgs particle: mass

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