Footprints of New Strong Dynamics via Anomaly and the 750 GeV Diphoton

TL;DR

This paper explores a new strong dynamics model where a pseudo-Nambu-Goldstone boson explains the 750 GeV diphoton excess at the LHC, with predictions of exotic hadrons detectable at current colliders.

Contribution

It introduces a novel QCD-like theory framework linking anomaly matching to the 750 GeV diphoton excess and predicts new exotic hadrons within LHC reach.

Findings

The pNG boson can account for the 750 GeV diphoton excess.

Production and decay are governed by anomaly matching, independent of strong dynamics details.

Predicted exotic hadrons include color octet scalars and baryons, accessible at the LHC.

Abstract

The chiral anomaly provides a smoking-gun evidence of a new confining gauge theory. Motivated by a reported event excess in a diphoton invariant mass distribution at the LHC, we discuss a scenario that a pseudo-Nambu-Goldstone (pNG) boson of a new QCD-like theory is produced by gluon fusion and decays into a pair of the standard model gauge bosons. Despite the strong dynamics, the production cross section and the decay widths are determined by anomaly matching condition. The excess can be explained by the pNG boson with mass of around 750 GeV. The model also predicts exotic hadrons such as a color octet scalar and baryons. Some of them are within the reach of the LHC experiment.