Abstract
A search is conducted for new resonances decaying into a W or Z boson and a 125 GeV Higgs boson in the nu overline{nu}boverline{b} , {ell}^{pm}nu boverline{b} , and {ell}^{+}{ell}^{-}boverline{b} final states, where ℓ± = e± or μ±, in pp collisions at sqrt{s}=13 TeV. The data used correspond to a total integrated luminosity of 36.1 fb−1 collected with the ATLAS detector at the Large Hadron Collider during the 2015 and 2016 data-taking periods. The search is conducted by examining the reconstructed invariant or transverse mass distributions of W h and Zh candidates for evidence of a localised excess in the mass range of 220 GeV up to 5 TeV. No significant excess is observed and the results are interpreted in terms of constraints on the production cross-section times branching fraction of heavy W′ and Z′ resonances in heavy-vector-triplet models and the CP-odd scalar boson A in two-Higgs-doublet models. Upper limits are placed at the 95% confidence level and range between 9.0 × 10−4 pb and 7.3 × 10−1 pb depending on the model and mass of the resonance.
Highlights
Background estimationThe background contamination in the signal regions is different for each of the three channels studied
This paper describes a search for the production of new heavy vector bosons, denoted hereafter by W and Z, that decay into a W or a Z boson and an h boson and a search for a heavy CP-odd scalar boson A that decays into a Z and an h boson
The production of W and Z bosons in association with jets was simulated with Sherpa 2.2.1 [59] using the NNPDF 3.0 NNLO parton density function (PDF) set [60] for both the matrix element calculation and the dedicated parton-shower tuning developed by the Sherpa authors
Summary
The ATLAS detector [40] at the LHC covers nearly the entire solid angle around the collision point. It consists of an inner tracking detector (ID) surrounded by a thin superconducting solenoid, electromagnetic and hadronic calorimeters, and a muon spectrometer incorporating three large superconducting toroid magnets. The ID is immersed in a 2 T axial magnetic field and provides charged-particle tracking in the range |η| < 2.5. It consists of silicon pixel, silicon microstrip, and transition radiation tracking detectors. Within the region |η| < 3.2, electromagnetic calorimetry is provided by barrel and endcap high-granularity lead/liquid-argon (LAr) electromagnetic calorimeters. This is followed by the software-based trigger level, the high-level trigger, which reduces the event rate further to about 1 kHz
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
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
