Search for heavy resonances, and resonant diboson production with the ATLAS detector

TL;DR

This paper reports on searches for heavy resonances and resonant diboson production using ATLAS data from 2011-2012, finding no deviations from the Standard Model and setting limits on various new physics models.

Contribution

First comprehensive set of ATLAS searches for heavy resonances and diboson signals at 7 and 8 TeV, constraining multiple beyond Standard Model theories.

Findings

No significant deviations observed from the Standard Model

Limits set on parameters of new physics models

Constraints on models like Z'/W', gravitons, and quantum black holes

Abstract

Heavy resonances decaying into a pair of fundamental particles such as $jj$, $\ell^+\ell^-$, $\gamma\gamma$, and $\ell\nu$, are among the most common features to search for phenomena beyond the standard model (SM). Electroweak boson pair production, such as $WW$ or $ZZ$ with subsequent decays to $\ell\nu\ell'\nu'$ and $\ell\ell jj$ respectively, is a powerful test of the spontaneously broken gauge symmetry of the SM and can be also used to search for phenomena beyond the SM. There is a wide spectrum of theoretical models predicting these kinds of resonant signatures. This note covers several searches for these new phenomena conducted within ATLAS in 2011 and 2012 for the LHC 7 and 8 TeV center of mass energies respectively. No significant deviations from the SM have been observed and therefore, limits are set on the characteristic parameters of several new physics models. These benchmark models include new heavy $Z'/W'$ gauge bosons, chiral excitation of the SM weak gauge bosons, $Z^*/W^*$ Randal-Sundrum and ADD gravitons, Composite models for quarks, e.g. $q^*$ with substructure scale $\Lambda$, Quantum black holes, TeV$^{-1}$ Kaluza-Klein excitation of $\gamma/Z$ and more.