Abstract
Abstract We show that within MSSM singlet extensions the experimental hints beyond the standard model from the Fermi LAT telescope as well as from the LHC can be explained simultaneously while being consistent with all experimental constraints. In particular we present an example point which features a ∼ 130 GeV lightest neutralino with an annihilation cross section into photons consistent with the indication from the Fermi satellite with simultaneously the right relic abundance, a continuum photon spectrum consistent with observation, direct detection cross section below the experimental limits, electroweak observables consistent with experiment and a 125 GeV light Higgs boson with a slightly enhanced h → γγ rate.
Highlights
In order to illustrate the constraints on the parameter space of the GNMSSM which arise from direct and indirect detection, we show the results of a scan over μ and M2 in figure 5
In this article we have shown that within the GNMSSM, a generalised version of the NMSSM, the experimental hints beyond the SM from the Fermi LAT telescope as well as from the LHC can be explained simultaneously while being consistent with all experimental constraints
As in the NMSSM the superpotential term λ SHuHd plays a crucial role in this scheme: it drives the annihilation of the lightest neutralino into photons, induces new tree-level contributions to the mass of the light Higgs boson h and enhances the partial width of the decay h → γγ
Summary
We consider the GNMSSM, a generalised version of the NMSSM, which has a superpotential of the form. WYukawa are the MSSM superpotential terms generating the usual Yukawa couplings and we used the freedom to shift the singlet S to set a potential linear term in S to zero This superpotential has additional explicit mass terms μ and μs which are not present in the Z3 symmetric NMSSM which is usually considered While the apparent un-naturalness of these additional mass terms has prevented a larger community from studying the phenomenology of the GNMSSM, it has recently been realised that exactly this structure naturally arises from an underlying R symmetry as discussed in [54] The fact that this R symmetry eliminates the dangerous dimension four and five baryon- and lepton-number violating terms and avoids destabilising tadpoles and domain wall problems makes it a more promising starting point than the Z3 symmetric NMSSM. We will show that large λ and light charginos can lead to a large annihilation cross section into photons, see figure 1
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