Direct search for heavy gauge bosons at the LHC in the nonuniversal SU(2) model

TL;DR

This paper investigates the detection prospects of heavy gauge bosons at the LHC within a nonuniversal SU(2) model, establishing lower mass bounds and emphasizing the importance of third-generation fermion channels.

Contribution

It introduces a nonuniversal SU(2) model for heavy gauge boson phenomenology and derives new mass bounds based on current LHC data.

Findings

Lower bounds on $Z'$ and $W'$ masses > 2 TeV for certain mixing angles

Current LHC data provides more stringent bounds than indirect methods

Heavy resonance studies in third-generation fermions are promising for future insights

Abstract

We study the phenomenology of heavy gauge bosons at the LHC in a nonuniversal gauge interaction model with the separate electroweak SU(2) gauge group for the third generation. Considered are the Drell-Yan processes into the final states of dilepton, dijet, $\tau^- \tau^+$, and $t \bar{t}$ for $Z'$ boson and those of lepton-neutrino for $W'$ boson. We find that the present LHC data provides lower bounds on the masses of the heavy gauge bosons, $m_{Z'},~m_{W'} > 2$ TeV, more stringent than indirect bounds, when $\sin^2 \phi > 0.15$ for the mixing angle of two SU(2) gauge groups.We also note that the study of heavy resonances into the third generation fermions may provide some valuable information in the future.