Searches for heavy diboson resonances in pp collisions at √s=13 TeV with the ATLAS detector

Aaboud, M. and Aad, G. and Abbott, B. and Abdallah, J. and Abdinov, O. and Krasznahorkay, Attila and Pásztor, Gabriella and Tóth, József (2016) Searches for heavy diboson resonances in pp collisions at √s=13 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS (9). ISSN 1126-6708

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Abstract

Searches for new heavy resonances decaying to WW, WZ, and ZZ bosons are presented, using a data sample corresponding to 3.2 fb−1 of pp collisions at √ s = 13 TeV collected with the ATLAS detector at the CERN Large Hadron Collider. Analyses selecting ννqq, `νqq, ``qq and qqqq final states are combined, searching for a narrow-width resonance with mass between 500 and 3000 GeV. The discriminating variable is either an invariant mass or a transverse mass. No significant deviations from the Standard Model predictions are observed. Three benchmark models are tested: a model predicting the existence of a new heavy scalar singlet, a simplified model predicting a heavy vector-boson triplet, and a bulk Randall-Sundrum model with a heavy spin-2 graviton. Cross-section limits are set at the 95% confidence level and are compared to theoretical cross-section predictions for a variety of models. The data exclude a scalar singlet with mass below 2650 GeV, a heavy vectorboson triplet with mass below 2600 GeV, and a graviton with mass below 1100 GeV. These results significantly extend the previous limits set using pp collisions at √ s = 8 TeV.

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