Left-right asymmetry and 750 GeV diphoton excess

TL;DR

This paper introduces novel left-right symmetric models based on extended gauge groups to explain the 750 GeV diphoton excess observed at the LHC, linking anomaly cancellation to the number of generations.

Contribution

It proposes new gauge symmetry models with minimal fermion content that naturally account for the diphoton excess and connect anomaly cancellation to the number of generations.

Findings

The diphoton excess is explained by symmetry-breaking fields in the models.

Neutrino masses and flavor-changing neutral currents are addressed.

The models predict new bosons relevant for collider searches.

Abstract

We propose the left-right models based on SU(3)_C\otimes SU(M)_L \otimes SU(N)_R \otimes U(1)_X gauge symmetry for (M,N)=(3,3), (2,3), and (3,2) that address the 750 GeV diphoton excess recently reported by the LHC. The fermion contents are minimally introduced, and the generation number must match the fundamental color number to cancel anomalies and ensure QCD asymptotic freedom. The diphoton excess arises from the field that breaks the left-right symmetry spontaneously in the first model, while for the last models it emerges as an explicit violation of the left-right symmetry. The neutrino masses, flavor-changing neutral currents, and new boson searches are also discussed.