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

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 $\ell \nu {\ell }^{\prime }{\nu }^{\prime }$ 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 $Z^{\prime }/W^{\prime }$ gauge bosons, chiral excitation of the SM weak gauge bosons, $Z^{\ast }/W^{\ast }$ Randal-Sundrum and ADD gravitons, Composite models for quarks, e.g. $q^{\ast }$ with substructure scale $\Lambda$, Quantum black holes, TeV${}^{-1}$ Kaluza-Klein excitation of $\gamma /Z$ and more.

References in corpus (3)

• Search for high-mass resonances decaying to dilepton final states in pp collisions at a center-of-mass energy of 7 TeV with the ATLAS detector
• Search for Extra Dimensions in diphoton events using proton-proton collisions recorded at sqrt(s) = 7 TeV with the ATLAS detector at the LHC
• ATLAS search for a heavy gauge boson decaying to a charged lepton and a neutrino in pp collisions at sqrt(s) = 7 TeV

Cited by in corpus (1)

• Optimal one-parameter observables for $Z^{\prime }$ searches in $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}$ process