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

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

ATLAS

Collaboration

Jan 23, 2023

45 pages

Published in:

JHEP 07 (2023) 090

Published: Jul 12, 2023

e-Print:

2301.09342 [hep-ex]

DOI:

10.1007/JHEP07(2023)090

PDG: Limits for other

{{\mathit Z}^{\,'}}

Report number:

CERN-EP-2022-251

Experiments:

CERN-LHC-ATLAS

View in:

reference search29 citations

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Abstract: (Springer)

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.[graphic not available: see fulltext]

Note:

45 pages in total, author list starting at page 26, 7 figures, 3 tables, published by JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2018-57/

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

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