Measurements of differential cross-sections in four-lepton events in 13 TeV proton-proton collisions with the ATLAS detector
Authors
Abraham, NL
Alunno Camelia, E
Amelung, C
Amrouche, CS
Andrei, V
Anelli, CR
Araujo Pereira, R
Publication Date
2021Journal Title
Journal of High Energy Physics
ISSN
1029-8479
Publisher
Springer Science and Business Media LLC
Volume
2021
Issue
7
Language
en
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Aad, G., Abbott, B., Abbott, D., Abed Abud, A., Abeling, K., Abhayasinghe, D., Abidi, S., et al. (2021). Measurements of differential cross-sections in four-lepton events in 13 TeV proton-proton collisions with the ATLAS detector. Journal of High Energy Physics, 2021 (7) https://doi.org/10.1007/JHEP07(2021)005
Abstract
Measurements of four-lepton differential and integrated fiducial
cross-sections in events with two same-flavour, opposite-charge electron or
muon pairs are presented. The data correspond to 139 fb$^{-1}$ of $\sqrt{s}=13$
TeV proton-proton collisions, collected by the ATLAS detector during Run 2 of
the Large Hadron Collider (2015-2018). The final state has contributions from a
number of interesting Standard Model processes that dominate in different
four-lepton invariant mass regions, including single $Z$ boson production,
Higgs boson production and on-shell $ZZ$ production, with a complex mix of
interference terms, and possible contributions from physics beyond the Standard
Model. The differential cross-sections include the four-lepton invariant mass
inclusively, in slices of other kinematic variables, and in different lepton
flavour categories. Also measured are dilepton invariant masses, transverse
momenta, and angular correlation variables, in four regions of four-lepton
invariant mass, each dominated by different processes. The measurements are
corrected for detector effects and are compared with state-of-the-art Standard
Model calculations, which are found to be consistent with the data. The
$Z\rightarrow 4\ell$ branching fraction is extracted, giving a value of
$\left(4.41 \pm 0.30\right) \times 10^{-6}$. Constraints on effective field
theory parameters and a model based on a spontaneously broken $B-L$ gauge
symmetry are also evaluated. Further reinterpretations can be performed with
the provided information.
Keywords
Regular Article - Experimental Physics, Hadron-Hadron scattering (experiments), Lepton production, proton-proton scattering, Beyond Standard Model, Branching fraction
Identifiers
jhep07(2021)005, 16103
External DOI: https://doi.org/10.1007/JHEP07(2021)005
This record's URL: https://www.repository.cam.ac.uk/handle/1810/329830
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/
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