Search for resonances with boson-tagged jets in 3.2 fb−1 of p p collisions at √ s = 13 TeV collected with the ATLAS detector

A search is performed for narrow resonances decaying into $WW$, $WZ$, or $ZZ$ boson pairs using 3.2/fb of proton-proton collision data at a centre-of-mass energy of $\sqrt{s}=13$ TeV recorded with the ATLAS detector at the Large Hadron Collider in 2015. The search for diboson resonances with masses in the range $1.2 < m_{VV} < 2.2$ TeV is performed using the invariant mass distribution of dijet events where both jets are identified through jet mass and substructure properties as being candidates for decaying vector boson, $W$ or $Z$. No significant deviations from the background expectations are seen. Exclusion limits at the $95\%$ confidence level are set on the production cross section times branching ratio for the $WZ$ and $WW$ final states of a new Heavy Vector Triplet, and for the $WW$ and $ZZ$ final states of Kaluza--Klein excitations of the graviton in a bulk Randall-Sundrum model, as a function of resonance mass. The additional charged vector boson of the Heavy Vector Triplet phenomenological Lagrangian, $W'$, is excluded in the mass range from 1.38 to 1.6 TeV at the $95\%$ confidence level through its decay to $WZ$.