Search for new resonances in \(W\gamma\) and \(Z\gamma\) Final States in \(pp\) Collisions at \(\sqrt{s}=8\,\mathrm{TeV}\) with the ATLAS Detector

Abstract

This letter presents a search for new resonances decaying to final states with a vector boson produced in association with a high transverse momentum photon, \(V\gamma\), with \(V= W(\rightarrow \ell \nu)\) or \(Z(\rightarrow \ell^{+} \ell^{-})\), where \(\ell = e\) or \(\mu\), The measurements use \(20.3\)~fb\(^{-1}\) of proton--proton collision data at a center--of--mass energy of \(\sqrt{s}=8\,\mathrm{TeV}\) recorded with the ATLAS detector. No deviations from the Standard Model expectations are found, and production cross section limits are set at 95\% confidence level. Masses of the hypothetical \(a_{\mathrm{T}}\) and \(\omega_{\mathrm{T}}\) states of a benchmark Low Scale Technicolor model are excluded in the ranges \([275,960]\,\mathrm{GeV}\) and \([200,700]\cup[750,890]\,\mathrm{GeV}\), respectively. Limits at 95% confidence level on the production cross section of a singlet scalar resonance decaying to \(Z\gamma\) final states have also been obtained for masses below \(1180\,\mathrm{GeV}\),