Abstract
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.
Highlights
Th√e ATLAS and CMS collaborations have recently reported an excess in diphoton searches at s = 13 TeV for a ∼ 750 GeV diphoton invariant mass [1,2,3]
Probably the most exciting theoretical possibility to accommodate this resonance is the one pursued by the authors of [5, 6, 8], who have contemplated scenarios with a scale of SUSY breaking not far from the TeV scale [11,12,13,14]
We have re-examined the diphoton excess observed by ATLAS and CMS [1,2,3] as a possible supersymmetric signal of low-scale SUSY breaking (LSSB) scenarios [11,12,13,14]
Summary
Probably the most exciting theoretical possibility to accommodate this resonance is the one pursued by the authors of [5, 6, 8], who have contemplated scenarios with a scale of SUSY breaking not far from the TeV scale (low-scale SUSY breaking) [11,12,13,14] These models contain the main ingredient to fit the signal: an scalar field φ (the sgoldstino) coupled to gluons and photons in a direct way, so that an effective production via gluon fusion and the subsequent decay into photons are possible. We discuss the possibility that sgoldstinos decay efficiently into Higgses (sect. 5), as the partial width into that channel is naively parametrically enhanced with respect to other channels; into Higgs decay channels through sgoldstino-Higgs mixing (sect. 6); and into Higgsinos (sect. 7), as there is more freedom to enhance this width without clashing with previous LHC searches
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