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Scientific article
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English

Search for excited τ-leptons and leptoquarks in the final state with τ-leptons and jets in pp collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 2023, no. 6, 199
Publication date2023
First online date2023-06-29
Abstract

A search is reported for excited τ-leptons and leptoquarks in events with two hadronically decaying τ-leptons and two or more jets. The search uses proton-proton (pp) collision data at $ \sqrt{s} $ = 13 TeV recorded by the ATLAS experiment during the Run 2 of the Large Hadron Collider in 2015–2018. The total integrated luminosity is 139 fb$^{−1}$. The excited τ-lepton is assumed to be produced and to decay via a four-fermion contact interaction into an ordinary τ-lepton and a quark-antiquark pair. The leptoquarks are assumed to be produced in pairs via the strong interaction, and each leptoquark is assumed to couple to a charm or lighter quark and a τ-lepton. No excess over the background prediction is observed. Excited τ-leptons with masses below 2.8 TeV are excluded at 95% CL in scenarios with the contact interaction scale Λ set to 10 TeV. At the extreme limit of model validity where Λ is set equal to the excited τ-lepton mass, excited τ-leptons with masses below 4.6 TeV are excluded. Leptoquarks with masses below 1.3 TeV are excluded at 95% CL if their branching ratio to a charm quark and a τ-lepton equals 1. The analysis does not exploit flavour-tagging in the signal region.

eng
Keywords
  • Exotics
  • Hadron-Hadron Scattering
  • P p: scattering
  • P p: colliding beams
  • Quark antiquark: pair
  • Lepton: excited state
  • Tau: excited state
  • Leptoquark: pair production
  • Tau: hadronic decay
  • Tau: particle identification
  • Final state: ((n)jet dilepton)
  • ATLAS
  • Charm
  • Contact interaction
  • Branching ratio
  • Strong interaction
  • CERN LHC Coll
  • Background
  • Excited state: mass
  • Leptoquark: mass
  • Mass: lower limit
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Search for excited τ-leptons and leptoquarks in the final state with τ-leptons and jets in pp collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector. In: The journal of high energy physics, 2023, vol. 2023, n° 6, p. 199. doi: 10.1007/jhep06(2023)199
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ISSN of the journal1029-8479
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