Combination of searches for heavy resonances decaying into bosonic and leptonic final states using 36fb −1 of proton?proton collision data at √ s = 13 TeV with the ATLAS detector

F. MONTICELLI,ATLAS COLLABORATION

PHYSICAL REVIEW D

AMER PHYSICAL SOC

Lugar: New York; Año: 2018

1550-7998

Searches for new heavy resonances decaying into different pairings of W, Z, or Higgs bosons,as well as directly into leptons, are presented using a data sample corresponding to 36.1 fb −1 of√pp collisions at s = 13 TeV collected during 2015 and 2016 with the ATLAS detector at theCERN Large Hadron Collider. Analyses selecting bosonic decay modes in the qqqq, ννqq,`νqq, ``qq, `ν`ν, ``νν, `ν``, ````, qqbb, ννbb, `νbb, and ``bb final states are combined,searching for a narrow-width resonance. Likewise, analyses selecting the leptonic `ν and ``final states are also combined. These two sets of analyses are then further combined. Nosignificant deviation from the Standard Model predictions is observed. Three benchmarkmodels are tested: a model predicting the existence of a new heavy scalar singlet, a simplifiedmodel predicting a heavy vector-boson triplet, and a bulk Randall?Sundrum model with aheavy spin-2 Kaluza?Klein excitation of the graviton. Cross-section limits are set at the 95%confidence level using an asymptotic approximation and are compared with predictions forthe benchmark models. These limits are also expressed in terms of constraints on couplingsof the heavy vector-boson triplet to quarks, leptons, and the Higgs boson. The data exclude aheavy vector-boson triplet with mass below 5.5 TeV in a weakly coupled scenario and 4.5 TeVin a strongly coupled scenario, as well as a Kaluza?Klein graviton with mass below 2.3 TeV.