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Search for a new Z′ gauge boson in 4μ events with the ATLAS experiment
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The ATLAS collaboration (Including: Becker, K., Guilloton, E., Harrison, P. F., Jones, E., Kerridge, B., Martin, T. A., Mitra, A., Morgenstern, S., Murray, W. J., Roberts, B. A. and Vladimirov, V. E.). (2023) Search for a new Z′ gauge boson in 4μ events with the ATLAS experiment. Journal of High Energy Physics, 2023 . 90. doi:10.1007/JHEP07(2023)090 ISSN 1029-8479.
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Official URL: https://doi.org/10.1007/JHEP07(2023)090
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 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 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, gZ′, of the Z′ boson to the second and third generation leptons above 0.003 – 0.2 have been excluded.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Journal or Publication Title: | Journal of High Energy Physics | ||||||
Publisher: | Springer | ||||||
ISSN: | 1029-8479 | ||||||
Official Date: | 12 July 2023 | ||||||
Dates: |
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Volume: | 2023 | ||||||
Article Number: | 90 | ||||||
DOI: | 10.1007/JHEP07(2023)090 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Date of first compliant deposit: | 6 September 2023 | ||||||
Date of first compliant Open Access: | 6 September 2023 |
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