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Scientific article
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English

Search for leptoquarks decaying into the bτ final state in $pp$ collisions at $ \sqrt{\textrm{s}} $ = 13 TeV with the ATLAS detector

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 2023, no. 10, 1
Publication date2023
First online date2023-10-02
Abstract

A search for leptoquarks decaying into the bτ final state is performed using Run 2 proton-proton collision data from the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb$^{−1}$ at $ \sqrt{s} $ = 13 TeV recorded by the ATLAS detector. The benchmark models considered in this search are vector leptoquarks with electric charge of 2/3e and scalar leptoquarks with an electric charge of 4/3e. No significant excess above the Standard Model prediction is observed, and 95% confidence level upper limits are set on the cross-section times branching fraction of leptoquarks decaying into bτ. For the vector leptoquark production two models are considered: the Yang-Mills and Minimal coupling models. In the Yang-Mills (Minimal coupling) scenario, vector leptoquarks with a mass below 1.58 (1.35) TeV are excluded for a gauge coupling of 1.0 and below 2.05 (1.99) TeV for a gauge coupling of 2.5. In the case of scalar leptoquarks, masses below 1.28 (1.53) TeV are excluded for a Yukawa coupling of 1.0 (2.5). Finally, an interpretation of the results with minimal model dependence is performed for each of the signal region categories, and limits on the visible cross-section for beyond the Standard Model processes are provided.

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Keywords
  • Beyond Standard Model
  • Hadron-Hadron Scattering
  • P p: colliding beams
  • Leptoquark: pair production
  • Leptoquark: decay modes
  • Coupling: minimal
  • Charge: electric
  • Coupling: gauge
  • Leptoquark: vector particle
  • Leptoquark: scalar
  • P p: scattering
  • Charge: 2
  • Leptoquark: branching ratio
  • Model: minimal
  • Coupling: Yukawa
  • Yang-Mills
  • ATLAS
  • Category
  • New physics: search for
  • Benchmark
  • Leptoquark: mass
  • Mass: lower limit
  • CERN LHC Coll
  • Channel cross section: branching ratio: upper limit
  • Experimental results
  • Leptoquark --> tau bottom
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Search for leptoquarks decaying into the bτ final state in $pp$ collisions at $ \sqrt{\textrm{s}} $ = 13 TeV with the ATLAS detector. In: The journal of high energy physics, 2023, vol. 2023, n° 10, p. 1. doi: 10.1007/jhep10(2023)001
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Article (Published version)
Identifiers
ISSN of the journal1029-8479
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