750 GeV diphoton resonance from singlets in an exceptional supersymmetric standard model

The 750-760 gev diphoton resonance 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. the three 27s also contain three copies of colour-triplet charge ∓1/3 vector-like fermions d, $$ overline{d} $$ and two copies of charged inert higgsinos $$ {tilde{h}}^{+} $$ , $$ {tilde{h}}^{-} $$ to which the singlets s 1,2 couple. we propose a variant of the e6ssm where the third singlet s 3 breaks a gauged u(1) n above the tev scale, predicting z ′ , d, $$ overline{d} $$ , $$ {tilde{h}}^{+} $$ , $$ {tilde{h}}^{-} $$ at lhc run 2, leaving the two lighter singlets s 1,2 with masses around 750 gev. 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.