Search for a new Z0 gauge boson in 4μ events with the ATLAS experiment Atlas Collaboration Aguilar Saavedra, Juan Antonio Rodríguez Chala, Mikael Beyond Standard Model Hadron-Hadron Scattering 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 = 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. 2023-10-27T10:25:34Z 2023-10-27T10:25:34Z 2023-07-12 journal article The ATLAS collaboration., Aad, G., Abbott, B. et al. Search for a new Z′ gauge boson in 4μ events with the ATLAS experiment. J. High Energ. Phys. 2023, 90 (2023). [https://doi.org/10.1007/JHEP07(2023)090] https://hdl.handle.net/10481/85307 10.1007/JHEP07(2023)090 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional Springer Nature