Abstract
We show that a 750 GeV di-photon excess as reported by the ATLAS and CMS experiments can be reproduced by the Minimal Dirac Gaugino Supersymmetric Standard Model (MDGSSM) without the need of any ad-hoc addition of new states. The scalar resonance is identified with the spin-0 partner of the Dirac bino. We perform a thorough analysis of constraints coming from the mixing of the scalar with the Higgs boson, the stability of the vacuum and the requirement of perturbativity of the couplings up to very high energy scales. We exhibit examples of regions of the parameter space that respect all the constraints while reproducing the excess. We point out how trilinear couplings that are expected to arise in supersymmetry-breaking mediation scenarios, but were ignored in the previous literature on the subject, play an important role.
Highlights
In the first presentation of LHC Run 2 data, both experiments ATLAS and CMS presented an excess in the di-photon mass spectrum for comparable invariant masses
Of particular interest will be S11 which measures if the lightest scalar eigenstate is Standard Model Higgs like, and S13 which measures the proportion of the scalar singlet SR in this lightest eigenstate
We have successfully demonstrated in the previous section that we are able to explain the di-photon excess in the Minimal Dirac Gaugino Supersymmetric Standard Model (MDGSSM) with an R-preserving SUSY-breaking sector, we would like to discuss as well two interesting R-violating scenarios
Summary
In the first presentation of LHC Run 2 data, both experiments ATLAS and CMS presented an excess in the di-photon mass spectrum for comparable invariant masses. Our parameter space is constrained by the requirements of stability of the vacuum avoiding existence of directions in the phase space of the model taking the fields expectation values to charge- and colour-breaking vacua This is important as we shall see that trilinear terms will play an important role in generating the required amount of scalar production and decay into di-photons. This will allow us to obtain the production and decays of our resonance at 8 and 13 TeV while simultaneously accurately computing its mass and assuring that the light Higgs mass is correct, and verifying that the mixing between the singlet and the Higgs is small ( computed at two loops).
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