E6 motivated UMSSM confronts experimental data

Abstract

We test E 6 realisations of a generic U(1) extended Minimal Supersymmetric Standard Model (UMSSM), parametrised in terms of the mixing angle pertaining to the new U(1) sector, θ E 6 , against all currently available data, from space to ground experiments, from low to high energies. We find that experimental constraints are very restrictive and indicate that large gauge kinetic mixing and θ E 6 ≈ −π/3 are required within this theoretical construct to achieve compliance with current data. The consequences are twofold. On the one hand, large gauge kinetic mixing implies that the Z boson emerging from the breaking of the additional U(1) symmetry is rather wide since it decays mainly into W W pairs. On the other hand, the preferred θ E 6 value calls for a rather specific E 6 breaking pattern different from those commonly studied. We finally delineate potential signatures of the emerging UMSSM scenario in both Large Hadron Collider (LHC) and in Dark Matter (DM) experiments.

Multicomponent dark matter in a simplified E6SSM

“…In such conditions, then, the bound from Z 0 → W þ W − is practically the same as from the dilepton searches. Our bounds are slightly lower than in [21], though, as in our case, the inert superpartners are light and take a share of the Z 0 BR. Notice that, in what follows the Z 0 mass is relevant in the DD rates of inert neutralinos, but the corresponding results can easily be scaled to a given Z 0 mass.…”

t − b − τ Yukawa unification in non-holomorphic MSSM

“…Hence, such particles may also escape usual SUSY searches. The recent studies have already shown that extending the symmetry and/or particle content can nicely fit the solutions to experimental data [11][12][13]. Moreover excluded regions of the MSSM parameter space can be realized consistent with the experimental results, if one simply considers non-holomophic (NH) terms in the soft supersymmetry breaking (SSB) lagrangian [14].…”

Electron and muon magnetic moments and implications for dark matter and model characterisation in non-universal U(1)′ supersymmetric models

“…Whereas in general U(1) models one must either introduce exotic fermion fields, or add three scalar singlets (secluded U(1) models) to cancel all anomalies. This class of models have been explored [75][76][77][78][79][80][81][82] by assuming family-universal U(1) charges for the MSSM fields inspired by the lepton universality of the SM. However, it is also possible to consider sets of U(1) charges in which different families of matter fields can have distinct charges [83].…”

“…Indeed, supersymmetric U(1) models were originally motivated by stabilizing the µ−term at the scales consistent with the EW symmetry breaking. This class of supersymmetric models can be motivated by the SUSY grand unified theories (GUTs), since additional U(1) groups can emerge from the breaking of grand unified groups larger than SU(5) such as SO (10) and E 6 , which are extensively explored in [73,79,84,85].…”