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

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