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Discovery potentials for extra neutral interactions at the Large HadronCollider in forthcoming experiments are analyzed using resonantleptoproduction. For this purpose we use high precision next-to-next-to-leadingorder (NNLO) determinations of the QCD background in this channel, at the tailof the Drell-Yan distributions, in the invariant mass region around $ 0.8< Q <2.5 $ TeV. We focus our analysis primarily on a novel string-inspired$Z^\prime$, obtained in left-right symmetric free fermionic heterotic stringmodels and whose existence at low energies is motivated by its role insuppressing proton decay mediation. We analyze the parametric dependence of thepredictions and perform comparison with other models based on bottom upapproaches, that are constructed by requiring anomaly cancellation and enlargedHiggs structure. We show that the results are not particularly sensitive to thespecific charge assignments. This may render quite difficult the extraction ofsignificant information from the forward-backward asymmetries on the resonance,assuming that these are possible due to a sizeable width. The challenge todiscover extra (non anomalous) $Z^\prime$ in this kinematic region remainsstrongly dependent on the size of the new gauge coupling. Weakly coupled extra$Z^\prime$ will not be easy to identify even with a very good theoreticaldetermination of the QCD background through NNLO.

Searching for Extra Z' from Strings and Other Models at the LHC with Leptoproduction