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130 GeV gamma ray line and enhanced Higgs di-photon rate from Triplet-Singlet extended MSSM

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Abstract

We propose an economic extension of minimal supersymmetric standard model with a SU(2) singlet and Y = 0 triplet, which can explain (i) the 125GeV Higgs boson without fine tuning, (ii) the 130 GeV γ-ray line seen at Fermi-LAT, (as well as a second photon line at 114 GeV)(iii) an enhanced Higgs di-photon decay rate seen by ATLAS, while being consistent with dark matter relic density and recent XENON 100 exclusion limits on spin-independent direct detection cross-section. We obtain the required cross-section of 10−27 cm 3 s −1 for the 130 GeV γ-ray flux through the resonant annihilation of dark matter via pseudoscalar triplet Higgs of mass ∼260GeV. The dark matter is predominantly binohiggsino which has large couplings with photons (through higgsino) and gives correct relic density (through bino). We get the enhanced Higgs diphoton decay rate, R γγ ≃ 1.224 dominantly contributed by the light chargino-loops, which can account for the reported excess seen in the h → γγ channel by ATLAS.

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  1. Physical Research Laboratory, Ahmedabad, 380009, India

    Tanushree Basak & Subhendra Mohanty

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  1. Tanushree Basak
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Basak, T., Mohanty, S. 130 GeV gamma ray line and enhanced Higgs di-photon rate from Triplet-Singlet extended MSSM. J. High Energ. Phys. 2013, 20 (2013). https://doi.org/10.1007/JHEP08(2013)020

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