Paper detail

Search for new resonances in $Wγ$ and $Zγ$ Final States in $pp$ Collisions at $\sqrt{s}=8$ TeV with the ATLAS Detector

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, $Vγ$, with $V= W(\rightarrow \ell ν)$ or $Z(\rightarrow \ell^{+} \ell^{-})$, where $\ell = e$ or $μ$. The measurements use 20.3 fb$^{-1}$ of proton-proton collision data at a center-of-mass energy of $\sqrt{s}=8$ 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 $a_{T}$ and $ω_{T}$ states of a benchmark Low Scale Technicolor model are excluded in the ranges [275,960] GeV and $[200,700]\cup[750,890]$ GeV, respectively. Limits at 95% confidence level on the production cross section of a singlet scalar resonance decaying to $Zγ$ final states have also been obtained for masses below 1180 GeV.