Search for long-lived charged particles using large specific ionisation loss and time of flight in 140 $f{b}^{-1}$ of $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

Abstract

This paper presents a search for massive, charged, long-lived particles with the ATLAS detector at the Large Hadron Collider using an integrated luminosity of 140 $f{b}^{-1}$ of proton-proton collisions at $\sqrt{s}=13$ TeV. These particles are expected to move significantly slower than the speed of light. In this paper, two signal regions provide complementary sensitivity. In one region, events are selected with at least one charged-particle track with high transverse momentum, large specific ionisation measured in the pixel detector, and time of flight to the hadronic calorimeter inconsistent with the speed of light. In the other region, events are selected with at least two tracks of opposite charge which both have a high transverse momentum and an anomalously large specific ionisation. The search is sensitive to particles with lifetimes greater than about 3 ns with masses ranging from 200 GeV to 3 TeV. The results are interpreted to set constraints on the supersymmetric pair production of long-lived R-hadrons, charginos and staus, with mass limits extending beyond those from previous searches in broad ranges of lifetime.

Comments: 56 pages in total, author list starting page 39, 14 figures, 9 tables, published by JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HMBS-2024-68/

References in corpus (33)

• 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
• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• Asymptotic formulae for likelihood-based tests of new physics
• Parton distributions with LHC data
• Out Of This World Supersymmetry Breaking
• The BABAR Detector
• Gaugino Mass without Singlets
• QCD Matrix Elements + Parton Showers
• Supersymmetric Unification Without Low Energy Supersymmetry And Signatures for Fine-Tuning at the LHC
• QCD matrix elements and truncated showers
• The Production of Charginos/Neutralinos and Sleptons at Hadron Colliders
• Simplified Models for a First Characterization of New Physics at the LHC
• Squark and gluino production cross sections in pp collisions at $\sqrt{s}$ = 13, 14, 33 and 100 TeV
• Neutralino-Stau Coannihilation and the Cosmological Upper Limit on the Mass of the Lightest Supersymmetric Particle
• Stable Massive Particles at Colliders
• Precision predictions for electroweak superpartner production at hadron colliders with Resummino
• Gaugino production in proton-proton collisions at a center-of-mass energy of 8 TeV
• Mass Splitting between Charged and Neutral Winos at Two-Loop Level
• Searching for Directly Decaying Gluinos at the Tevatron
• Threshold resummation for gaugino pair production at hadron colliders
• A neural network clustering algorithm for the ATLAS silicon pixel detector
• Long life stau in the minimal supersymmetric standard model
• An Updated Description of Heavy-Hadron Interactions in Geant-4
• Slepton pair production at the LHC in NLO+NLL with resummation-improved parton densities
• Measuring Lepton Flavour Violation at LHC with Long-Lived Slepton in the Coannihilation Region
• Lepton-Flavoured Scalar Dark Matter in Dark Minimal Flavour Violation
• The Impact of Incorporating Shell-corrections to Energy Loss in Silicon
• dE/dx from boosted long-lived particles

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