Search for a new $$Z$$' gauge boson in 4$$μ$$ events with the ATLAS experiment
- Centre National de la Recherche Scientifique (CNRS), Marseille (France). Centre de Physique des Particules de Marseille (CPPM), Institut National de Physique Nucleaire et de Physique des Particules (IN2P3); Aix-Marseille Université (France); The ATLAS Collaboration. et al.
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 Lμ - Lτ models to address observed phenomena that cannot 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, gZ', of the Z' boson to the second and third generation leptons above 0.003 – 0.2 have been excluded.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of Michigan, Ann Arbor, MI (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- The ATLAS Collaboration
- Grant/Contract Number:
- AC02-05CH11231; SC0007859
- OSTI ID:
- 2282079
- Journal Information:
- Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 7 Vol. 2023; ISSN 1029-8479
- Publisher:
- Springer NatureCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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