A W/Z-boson tagger using Track-CaloCluster jets with ATLAS

The performance of a W/Z-boson tagger optimized for a diboson resonance search in semi- leptonic final states is presented. A new particle-flow algorithm dedicated to jets with high transverse momentum, Track-CaloClusters, is introduced to improve the resolution of the jet substructure variable. The performance is measured in pp-collisions data at a centre-of-mass energy of 13 TeV collected with the ATLAS detector corresponding integrated luminosity of 80 fb^−1. The measured signal efficiency and the background rejection factor in data agree with Monte Carlo simulation within the evaluated uncertainty.