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A search for diboson resonances at ATLAS using boson-tagged jets

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With the advent of 13TeV proton-proton collisions at the LHC it is natural to trawl through this data searching for new resonances with the highest possible masses. Do we have any clues of what we might expect in this new energy regime? An ATLAS paper released in the dying moments of LHC Run-1 offers us a possible direction. This paper describes a search for a heavy resonance (either a W’ or a Randall-Sundrum Graviton) decaying into a diboson pair, leading to highly boosted hadronic jets. By exploiting jet substructure techniques to pick the signal out of the dominant QCD backgrounds the analysis can take advantage of the high branching fraction enjoyed by the fully hadronic decay channel. In this seminar I will describe the jet-substructure techniques explored by the analysis, present the results of the analysis of the 20fb^-1 of 8TeV ATLAS data and finally look to the prospects with the new collision data.

This talk is part of the Cavendish HEP Seminars series.

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