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Scientific article
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English

Search for heavy, long-lived, charged particles with large ionisation energy loss in $pp$ collisions at $\sqrt{s} = 13~\text{TeV}$ using the ATLAS experiment and the full Run 2 dataset

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 2023, no. 6, 158
Publication date2023
First online date2023-06-26
Abstract

This paper presents a search for hypothetical massive, charged, long-lived particles with the ATLAS detector at the LHC using an integrated luminosity of 139 fb$^{−1}$ of proton–proton collisions at $ \sqrt{s} $ = 13 TeV. These particles are expected to move significantly slower than the speed of light and should be identifiable by their high transverse momenta and anomalously large specific ionisation losses, dE/dx. Trajectories reconstructed solely by the inner tracking system and a dE/dx measurement in the pixel detector layers provide sensitivity to particles with lifetimes down to $ \mathcal{O} $(1) ns with a mass, measured using the Bethe–Bloch relation, ranging from 100 GeV to 3 TeV. Interpretations for pair-production of R-hadrons, charginos and staus in scenarios of supersymmetry compatible with these particles being long-lived are presented, with mass limits extending considerably beyond those from previous searches in broad ranges of lifetime.

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Keywords
  • Beyond Standard Model
  • Exotics
  • Hadron-Hadron Scattering
  • Supersymmetry
  • P p: colliding beams
  • Semiconductor detector: pixel
  • Ionization: energy loss
  • Charged particle: long-lived
  • Photon: velocity
  • Transverse momentum: high
  • P p: scattering
  • ATLAS
  • Chargino: lifetime
  • Stau: lifetime
  • R-hadron: pair production
  • Stau: pair production
  • Charged particle: transverse momentum
  • Charged particle: energy loss
  • Trajectory
  • Sensitivity
  • CERN LHC Coll
  • Tracking detector
  • Chargino: pair production
  • Supersymmetry: parameter space
  • Chargino: mass
  • Stau: mass
  • R-hadron: mass
  • Mass: lower limit
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Search for heavy, long-lived, charged particles with large ionisation energy loss in $pp$ collisions at $\sqrt{s} = 13~\text{TeV}$ using the ATLAS experiment and the full Run 2 dataset. In: The journal of high energy physics, 2023, vol. 2023, n° 6, p. 158. doi: 10.1007/jhep06(2023)158
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ISSN of the journal1029-8479
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