Stringy origin of diboson and dijet excesses at the LHC

TL;DR

This paper proposes a string-inspired model with an anomalous U(1) gauge boson to explain recent diboson and dijet excesses at the LHC, avoiding constraints and predicting distinctive signatures.

Contribution

It introduces a string-theoretic framework with a leptophobic Z' boson that accounts for the excesses and predicts unique Zγ signals for future validation.

Findings

The model explains the excesses with a leptophobic Z' gauge boson.

It evades Drell-Yan bounds due to leptophobia.

A distinctive Zγ signature is predicted for stringy origins.

Abstract

Very recently, the ATLAS and CMS collaborations reported diboson and dijet excesses above standard model expectations in the invariant mass region of 1.8 -2.0 TeV. Interpreting the diboson excess of events in a model independent fashion suggests that the vector boson pair production searches are best described by WZ or ZZ topologies, because states decaying into W^+W^- pairs are strongly constrained by semileptonic searches. Under the assumption of a low string scale, we show that both the diboson and dijet excesses can be steered by an anomalous U(1) field with very small coupling to leptons. The Drell-Yan bounds are then readily avoided because of the leptophobic nature of the massive Z' gauge boson. The non-negligible decay into ZZ required to accommodate the data is a characteristic footprint of intersecting D-brane models, wherein the Landau-Yang theorem can be evaded by anomaly-induced operators involving a longitudinal Z. The model presented herein can be viewed purely field-theoretically, although it is particularly well motivated from string theory. Should the excesses become statistically significant at the LHC13, the associated Z\gamma{} topology would become a signature consistent only with a stringy origin.