Prospects for Spin-1 Resonance Search at 13 TeV LHC and the ATLAS Diboson Excess

TL;DR

This paper explores the potential of spin-1 resonances, specifically W' and Z', to explain the ATLAS diboson excess at 2 TeV, analyzing theoretical constraints and collider prospects at 13 TeV LHC.

Contribution

It introduces a model with spin-1 resonances linked to strong dynamics, evaluates current constraints, and assesses future collider search prospects for explaining the diboson excess.

Findings

The main decay modes are V' -> VV and V' -> Vh.

The V' width is narrow enough to explain the excess.

Future LHC runs can probe the relevant parameter space.

Abstract

Motivated by ATLAS diboson excess around 2 TeV, we investigate a phenomenology of spin-1 resonances in a model where electroweak sector in the SM is weakly coupled to strong dynamics. The spin-1 resonances, W' and Z', are introduced as effective degrees of freedom of the dynamical sector. We explore several theoretical constraints by investigating the scalar potential of the model as well as the current bounds from the LHC and precision measurements. It is found that the main decay modes are V' -> VV and V' -> Vh, and the V' width is narrow enough so that the ATLAS diboson excess can be explained. In order to investigate future prospects, we also perform collider simulations at the 13 TeV LHC, and obtain a model independent expected exclusion limit for the process pp -> W' -> WZ -> JJ. We find a parameter space where the diboson excess can be explained, and are within a reach of the LHC at the integrated luminosity of 10 fb-1 and 13 TeV.