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The 750 GeV Diphoton Excess as a First Light on Supersymmetry Breaking

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arxiv 1512.07895 v2 pith:J4DODGT2 submitted 2015-12-24 hep-ph

The 750 GeV Diphoton Excess as a First Light on Supersymmetry Breaking

classification hep-ph
keywords sgoldstinoexcesswidthalternativediphotonefficientresonancescalar
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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One of the most exciting explanations advanced for the recent diphoton excess found by ATLAS and CMS is in terms of sgoldstino decays: a signal of low-energy supersymmetry-breaking scenarios. The sgoldstino, a scalar, couples directly to gluons and photons, with strength related to gaugino masses, that can be of the right magnitude to explain the excess. However, fitting the suggested resonance width, Gamma ~ 45 GeV, is not so easy. In this paper we explore efficient possibilities to enhance the sgoldstino width, via the decay into two Higgses, two Higgsinos and through mixing between the sgoldstino and the Higgs boson. In addition, we present an alternative and more efficient mechanism to generate a mass splitting between the scalar and pseudoscalar components of the sgoldstino, which has been suggested as an interesting alternative explanation to the apparent width of the resonance.

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