Signal of Right-Handed Charged Gauge Bosons at the LHC?

TL;DR

This paper suggests that recent CMS excess events could be explained by a TeV-scale right-handed W boson in a left-right symmetric model with D parity violation, implying new physics beyond the Standard Model.

Contribution

It introduces a model where D parity breaking leads to a suppressed gauge coupling for W_R, aligning with CMS observations and providing a novel explanation for the excess.

Findings

CMS excess compatible with W_R at 1.9-2.4 TeV

W_R coupling g_R ~ 0.6 g_L consistent with models

Implications for baryon/lepton number violation and neutrino masses

Abstract

We point out that the recent excess observed in searches for a right-handed gauge boson W_R at CMS can be explained in a left-right symmetric model with D parity violation. In a class of SO(10) models, in which D parity is broken at a high scale, the left-right gauge symmetry breaking scale is naturally small, and at a few TeV the gauge coupling constants satisfy g_R ~ 0.6 g_L. Such models therefore predict a right-handed charged gauge boson W_R in the TeV range with a suppressed gauge coupling as compared to the usually assumed manifest left-right symmetry case g_R = g_L. The recent CMS data show excess events which are consistent with the cross section predicted in the D parity breaking model for 1.9 TeV < M_{W_R} < 2.4 TeV. If the excess is confirmed, it would in general be a direct signal of new physics beyond the Standard Model at the LHC. A TeV scale W_R would for example not only rule out SU(5) grand unified theory models. It would also imply B-L violation at the TeV scale, which would be the first evidence for baryon or lepton number violation in nature and it has strong implications on the generation of neutrino masses and the baryon asymmetry in the Universe.