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Scientific article
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English

Search for a new Z' gauge boson in $4\mu$ events with the ATLAS experiment

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 2023, 90
Publication date2023
First online date2023-07-12
Abstract

This paper presents a search for a new Z′ vector gauge boson with the ATLAS experiment at the Large Hadron Collider using pp collision data collected at $ \sqrt{s} $ = 13 TeV, corresponding to an integrated luminosity of 139 fb$^{−1}$. The new gauge boson Z′ is predicted by L$_{μ}$ − L$_{τ}$ models to address observed phenomena that can not be explained by the Standard Model. The search examines the four-muon (4μ) final state, using a deep learning neural network classifier to separate the Z′ signal from the Standard Model background events. The di-muon invariant masses in the 4μ events are used to extract the Z′ resonance signature. No significant excess of events is observed over the predicted background. Upper limits at a 95% confidence level on the Z′ production cross-section times the decay branching fraction of pp → Z′μμ → 4μ are set from 0.31 to 4.3 fb for the Z′ mass ranging from 5 to 81 GeV. The corresponding common coupling strengths, g$_{Z′}$, of the Z′ boson to the second and third generation leptons above 0.003 – 0.2 have been excluded.

eng
Keywords
  • Beyond Standard Model
  • Hadron-Hadron Scattering
  • P p: colliding beams
  • Z': mass: lower limit
  • New particle
  • Decay: time
  • Family: 3
  • Muon: pair production
  • Z': associated production
  • P p: scattering
  • Gauge boson
  • Background
  • ATLAS
  • Mass spectrum: (muon+ muon-)
  • Coupling constant: upper limit
  • Channel cross section: branching ratio: upper limit
  • Final state: (4lepton)
  • Muon: particle identification
  • CERN LHC Coll
  • Signature
  • Neural network
  • Statistical analysis
  • Data analysis method
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Search for a new Z” gauge boson in $4\mu$ events with the ATLAS experiment. In: The journal of high energy physics, 2023, vol. 2023, p. 90. doi: 10.1007/jhep07(2023)090
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ISSN of the journal1029-8479
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