Search for emerging jets in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS experiment

Abstract

A search is presented for emerging jets using 140 fb${}^{-1}$ of proton-proton collision data at $\sqrt{s}=13$ TeV, collected by the ATLAS experiment between 2015 and 2018. The search looks for the existence of a dark sector with symmetries similar to those in quantum chromodynamics. This dark sector is populated with dark quarks, which undergo showering similar to quarks in the Standard Model, leading to a high multiplicity of long-lived dark hadrons within a dark jet. These dark hadrons subsequently decay to Standard Model particles via a new heavy scalar mediating particle $\varphi$. This results in jets which contain multiple displaced vertices, known as emerging jets. This analysis targets four-jet topologies, with two emerging jets and two Standard Model jets, resulting from the decay of pair-produced scalar mediators. No significant excess above the Standard Model background is observed. For dark pion proper decay lengths of 20 mm, mediator masses are excluded between 1 TeV and 2 TeV assuming a dark pion mass of 20 GeV.

arXiv comment45 pages in total, author list starting page 28, 12 figures, 6 tables, published in EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2018-20/

References in corpus (53)

• An Introduction to PYTHIA 8.2
• A Brief Introduction to PYTHIA 8.1
• Asymptotic formulae for likelihood-based tests of new physics
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• A direct empirical proof of the existence of dark matter
• Parton distributions with LHC data
• The ATLAS Simulation Infrastructure
• Echoes of a Hidden Valley at Hadron Colliders
• Performance of the ATLAS Trigger System in 2015
• Production and Integration of the ATLAS Insertable B-Layer
• Topological cell clustering in the ATLAS calorimeters and its performance in LHC Run 1
• Study of the material of the ATLAS inner detector for Run 2 of the LHC
• Jet energy scale measurements and their systematic uncertainties in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• ATLAS data quality operations and performance for 2015-2018 data-taking
• Jet energy scale and resolution measured in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Dark Matter Search Results from the Complete Exposure of the PICO-60 C${}_3$F${}_8$ Bubble Chamber
• Discovering the Higgs Through Highly-Displaced Vertices
• Phenomenology of Hidden Valleys at Hadron Colliders
• DarkSide-50 532-day Dark Matter Search with Low-Radioactivity Argon
• Measurement of the Inelastic Proton-Proton Cross Section at $\sqrt{s}=13$ TeV with the ATLAS Detector at the LHC
• Emerging Jets
• Luminosity determination in $pp$ collisions at $\sqrt{s}=13$ TeV using the ATLAS detector at the LHC
• Dark Matter Search Results from 4.2 Tonne-Years of Exposure of the LUX-ZEPLIN (LZ) Experiment
• Semi-visible Jets: Dark Matter Undercover at the LHC
• NNLL-fast: predictions for coloured supersymmetric particle production at the LHC with threshold and Coulomb resummation
• Operation of the ATLAS trigger system in Run 2
• ATLAS flavour-tagging algorithms for the LHC Run 2 $pp$ collision dataset
• The Scale of Dark QCD
• Search for Low-Mass Dark Matter with CDMSlite Using a Profile Likelihood Fit
• Visible Effects of Invisible Hidden Valley Radiation
• Dark Matter Search Results from 1.54 Tonne$\cdot$Year Exposure of PandaX-4T
• Search for Coherent Elastic Scattering of Solar ${}^8$B Neutrinos in the XENON1T Dark Matter Experiment
• Search for long-lived, weakly interacting particles that decay to displaced hadronic jets in proton-proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• NNLL resummation for stop pair-production at the LHC
• In situ calibration of large-$R$ jet energy and mass in 13 TeV proton-proton collisions with the ATLAS detector
• Tagging a jet from a dark sector with Jet-substructures at colliders
• Search for new particles decaying to a jet and an emerging jet
• Dark matter in Hidden Valley models with stable and unstable light dark mesons
• The performance of the jet trigger for the ATLAS detector during 2011 data taking
• Search for resonant production of strongly coupled dark matter in proton-proton collisions at 13 TeV
• Dark sector searches with the CMS experiment
• Exploration at the high-energy frontier: ATLAS Run~2 searches investigating the exotic jungle beyond the Standard Model
• Search for exotic decays of the Higgs boson into long-lived particles in $pp$ collisions at $\sqrt{s}=13$ TeV using displaced vertices in the ATLAS inner detector
• Performance of the upgraded PreProcessor of the ATLAS Level-1 Calorimeter Trigger
• Search for non-resonant production of semi-visible jets using Run 2 data in ATLAS
• Recent results from DEAP-3600
• Search for new physics in final states with semi-visible jets or anomalous signatures using the ATLAS detector
• Search for Resonant Production of Dark Quarks in the Dijet Final State with the ATLAS Detector
• Search for dark QCD with emerging jets in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Search for emerging jets in $pp$ collisions at $\sqrt{s}=13.6$ TeV with the ATLAS experiment
• t-channel dark matter at the LHC -- a whitepaper