Scientific article
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Search for pair production of third-generation leptoquarks decaying into a bottom quark and a 𝜏 -lepton with the ATLAS detector

ContributorsATLAS Collaboration
Published inEuropean physical journal. C, Particles and fields, vol. 83, no. 11, 1075
Publication date2023
First online date2023-11-24
Abstract

A search for pair-produced scalar or vector leptoquarks decaying into a b-quark and a $\tau $-lepton is presented using the full LHC Run 2 (2015–2018) data sample of 139 fb$^{-1}$ collected with the ATLAS detector in proton–proton collisions at a centre-of-mass energy of $\sqrt{s} =13$ TeV. Events in which at least one $\tau $-lepton decays hadronically are considered, and multivariate discriminants are used to extract the signals. No significant deviations from the Standard Model expectation are observed and 95% confidence-level upper limits on the production cross-section are derived as a function of leptoquark mass and branching ratio $\mathcal {B}$ into a $\tau $-lepton and b-quark. For scalar leptoquarks, masses below 1460 GeV are excluded assuming $\mathcal {B}=100$%, while for vector leptoquarks the corresponding limit is 1650 GeV (1910 GeV) in the minimal-coupling (Yang–Mills) scenario.

Keywords
  • P p: colliding beams
  • Family: 3
  • Leptoquark: scalar
  • P p: scattering
  • Leptoquark: mass
  • Tau: particle identification
  • Tau: hadronic decay
  • Leptoquark: branching ratio
  • ATLAS
  • Leptoquark: pair production
  • Vector
  • Yang-Mills
  • CERN LHC Coll
  • Channel cross section: upper limit
  • Mass dependence
  • Leptoquark: mass: lower limit
  • Experimental results
  • Leptoquark --> bottom tau
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Search for pair production of third-generation leptoquarks decaying into a bottom quark and a 𝜏 -lepton with the ATLAS detector. In: European physical journal. C, Particles and fields, 2023, vol. 83, n° 11, p. 1075. doi: 10.1140/epjc/s10052-023-12104-7
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Article (Published version)
Identifiers
Journal ISSN1434-6044
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