Search for Resonant Production of Dark Quarks in the Dijet Final State with the ATLAS Detector

Abstract

This paper presents a search for a new $Z^{\prime }$ resonance decaying into a pair of dark quarks which hadronise into dark hadrons before promptly decaying back as Standard Model particles. This analysis is based on proton-proton collision data recorded at $\sqrt{s}=13$ TeV with the ATLAS detector at the Large Hadron Collider between 2015 and 2018, corresponding to an integrated luminosity of 139 fb${}^{-1}$. After selecting events containing large-radius jets with high track multiplicity, the invariant mass distribution of the two highest-transverse-momentum jets is scanned to look for an excess above a data-driven estimate of the Standard Model multijet background. No significant excess of events is observed and the results are thus used to set 95 % confidence-level upper limits on the production cross-section times branching ratio of the $Z^{\prime }$ to dark quarks as a function of the $Z^{\prime }$ mass for various dark-quark scenarios.

arXiv comment33 pages in total, author list starting page 16, 7 figures, 2 tables, published by JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2018-45

References in corpus (15)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• A Brief Introduction to PYTHIA 8.1
• FastJet user manual
• Parton distributions for the LHC
• Asymptotic formulae for likelihood-based tests of new physics
• Parton distributions with LHC data
• PDF4LHC recommendations for LHC Run II
• Successive Combination Jet Algorithm For Hadron Collisions
• The Catchment Area of Jets
• Jet Trimming
• Automated Parton-Shower Variations in Pythia 8
• Lepton Jets from Radiating Dark Matter
• Tagging a jet from a dark sector with Jet-substructures at colliders

Cited by in corpus (4)

• Search for new physics in final states with semi-visible jets or anomalous signatures using the ATLAS detector
• Search for emerging jets in $pp$ collisions at $\sqrt{s}=13.6$ TeV with the ATLAS experiment
• Search for emerging jets in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS experiment
• Overview of the ESCAPE Dark Matter Test Science Project for Astronomers