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The di-photon excess observed at the LHC can be explained as a Standard Modelsinglet that is produced and decays by heavy vector-like colour triplets andelectroweak doublets in one-loop diagrams. The characteristics of the requiredspectrum are well motivated in heterotic-string constructions that allow for alight $Z^\prime$. Anomaly cancellation of the $U(1)_{Z^\prime}$ symmetryrequires the existence of the Standard Model singlet and vector-like states inthe vicinity of the $U(1)_{Z^\prime}$ breaking scale. In this paper we showthat the agreement with the gauge coupling data at one-loop is identical to thecase of the Minimal Supersymmetric Standard Model, owing to cancellationsbetween the additional states. We further show that effects arising from heavythresholds may push the supersymmetric spectrum beyond the reach of the LHC,while maintaining the agreement with the gauge coupling data. We show that thestring inspired model can indeed account for the observed signal and discussthe feasibility of obtaining viable scalar mass spectrum.

The LHC di-photon excess and Gauge Coupling Unification in Extra $Z^\prime$ Heterotic-String Derived Models