750 GeV Diphotons: Implications for Supersymmetric Unification II

Lawrence J. Hall; Keisuke Harigaya; Yasunori Nomura

doi:10.1007/JHEP07(2016)149

paper

750 GeV Diphotons: Implications for Supersymmetric Unification II

arXiv:1605.03585 · doi:10.1007/JHEP07(2016)149

Abstract

Perturbative supersymmetric gauge coupling unification is possible in six theories where complete SU(5) TeV-scale multiplets of vector matter account for the size of the reported $750 GeV$ diphoton resonance, interpreted as a singlet multiplet $S = (s + ia) / 2$ . One of these has a full generation of vector matter and a unified gauge coupling $α_{G} \sim 1$ . The diphoton signal rate is enhanced by loops of vector squarks and sleptons, especially when the trilinear $A$ couplings are large. If the $S H_{u} H_{d}$ coupling is absent, both $s$ and $a$ can contribute to the resonance, which may then have a large apparent width if the mass splitting from $s$ and $a$ arises from loops of vector matter. The width depends sensitively on $A$ parameters and phases of the vector squark and slepton masses. Vector quarks and/or squarks are expected to be in reach of the LHC. If the $S H_{u} H_{d}$ coupling is present, $a$ leads to a narrow diphoton resonance, while a second resonance with decays $s \to hh, W^{+} W^{-}, Z Z$ is likely to be discovered at future LHC runs. In some of the theories a non-standard origin or running of the soft parameters is required, for example involving conformal hidden sector interactions.

26 pages, 11 figures

750 GeV Diphotons: Implications for Supersymmetric Unification II

Abstract

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