Jul 3 – 8, 2016
The University of Melbourne
Australia/Melbourne timezone

The 750 GeV diphoton LHC excess from Singlets in Exceptional Supersymmetric Standard Model

Jul 5, 2016, 2:40 PM
Alice Hoy Room 225

Alice Hoy Room 225

Talk SUSY Models SUSY Models


Roman Nevzorov (University of Adelaide)


The 750-760 GeV diphoton resonance may be identified as one or two scalars and/or
one or two pseudoscalars contained in the two singlet superfields $S_{1,2}$
arising from the three 27-dimensional representations of $E_6$. We study the corresponding collider signature within the exceptional supersymmetric standard model (E$_6$SSM). This model is based on the SM gauge group together with an extra $U(1)_N$ gauge symmetry under which right--handed neutrinos have zero charge. To ensure anomaly cancellation the low energy matter content of the E$_6$SSM involve three $27$ representations of $E_6$. Thus E$_6$SSM predicts $Z'$ boson and extra matter beyond the MSSM. In particular, the low--energy spectrum of the E$_6$SSM involves three families of Higgs--like doublets,three families of exotic quarks and three SM singlets $S_i$ that carry $U(1)_{N}$ charges. The E$_6$SSM Higgs sector contains one family of the Higgs--like doublets and one SM singlet $S_3$ that develops vacuum expectation values (VEV) breaking $U(1)_N$ gauge symmetry and inducing masses of exotic states mentioned above. The fermion and scalar components of other Higgs--like superfields form Inert Higgsino and Inert Higgs states respectively. Two lighter singlets $S_{1,2}$
with masses around 750 GeV can couple to Inert Higgsino and exotic quarks giving rise to diphoton excess. We calculate the branching ratios and cross-sections for the two scalar and two pseudoscalar states associated with the $S_{1,2}$ singlets, including possible degeneracies and maximal mixing, subject to the constraint that their couplings remain perturbative up to the unification scale.

Primary author

Roman Nevzorov (University of Adelaide)


Stephen King

Presentation materials