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Search for a new Z0 gauge boson in 4µ events with the ATLAS experiment ATLAS Collaboration
Abstract
This paper presents a search for a new Z 0 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 0 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 0 signal from the Standard Model background events. The di-muon invariant masses in the 4µ events are used to extract the Z 0 resonance signature. No significant excess of events is observed over the predicted background. Upper limits at a 95% confidence level on the Z 0 production cross-section times the decay branching fraction of pp → Z 0µµ → 4µ are set from 0.31 to 4.3 fb for the Z 0 mass ranging from 5 to 81 GeV. The corresponding common coupling strengths, gZ0, of the Z 0 boson to the second and third generation leptons above 0.003 – 0.2 have been excluded.
Item Metadata
Title |
Search for a new Z0 gauge boson in 4µ events with the ATLAS experiment
|
Creator | |
Publisher |
Springer Berlin Heidelberg
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Date Issued |
2023-07-12
|
Description |
This paper presents a search for a new Z
0 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
0
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
0
signal from the Standard Model background
events. The di-muon invariant masses in the 4µ events are used to extract the Z
0
resonance
signature. No significant excess of events is observed over the predicted background. Upper
limits at a 95% confidence level on the Z
0 production cross-section times the decay branching
fraction of pp → Z
0µµ → 4µ are set from 0.31 to 4.3 fb for the Z
0 mass ranging from 5 to
81 GeV. The corresponding common coupling strengths, gZ0, of the Z
0 boson to the second
and third generation leptons above 0.003 – 0.2 have been excluded.
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Subject | |
Genre | |
Type | |
Language |
eng
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Date Available |
2023-09-15
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution 4.0 International (CC BY 4.0)
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DOI |
10.14288/1.0435898
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URI | |
Affiliation | |
Citation |
Journal of High Energy Physics. 2023 Jul 12;2023(7):90
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Publisher DOI |
10.1007/JHEP07(2023)090
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Peer Review Status |
Reviewed
|
Scholarly Level |
Faculty; Researcher
|
Copyright Holder |
The Author(s)
|
Rights URI | |
Aggregated Source Repository |
DSpace
|
Item Media
Item Citations and Data
Rights
Attribution 4.0 International (CC BY 4.0)