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 $\sqrt{s}=13$ TeV collected with the ATLAS detector at the CERN Large Hadron Collider. Analyses selecting $\nu\nu qq$, $\ell\nu qq$, $\ell\ell qq$ 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 vector-boson 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 $\sqrt{s}=8$ TeV.
Highlights
Background estimationThe background contamination in the signal regions is different for each of the channels studied
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
This study shows that the current analysis is more sensitive to the Heavy Vector Triplet (HVT) model A for triplet masses above 1.6 TeV, and that the ratio of the expected cross-section limit to the theoretical cross-section improves by a factor two for triplet masses of 2 TeV
Summary
The ATLAS detector [33] is a general-purpose particle detector used to investigate a broad range of physics processes It includes inner tracking devices surrounded by a superconducting solenoid, electromagnetic (EM) and hadronic calorimeters, and a muon spectrometer inside a system of toroid magnets. The inner detector (ID) consists of a silicon pixel detector including the newly installed Insertable B-Layer [34], a silicon microstrip detector and a straw tube tracker. It is situated inside a 2 T axial magnetic field from the solenoid and provides precision tracking of charged particles with pseudorapidity2 |η| < 2.5. The data are required to satisfy a number of conditions ensuring that the detector was operating well while the data were recorded
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
