Article open access publication

Measurement of the four-lepton invariant mass spectrum in 13 TeV proton-proton collisions with the ATLAS detector

Journal of High Energy Physics, Springer Nature, ISSN 1126-6708

Volume 2019, 4, 2019

DOI:10.1007/jhep04(2019)048, Dimensions: pub.1113302975,

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  1. (1) Mohamed I University, grid.410890.4
  2. (2) Center for Particle Physics of Marseilles, grid.470046.1
  3. (3) University of Oklahoma, grid.266900.b
  4. (4) Institute of Physics, grid.435347.2
  5. (5) Laboratoire de l'Accélérateur Linéaire, grid.462450.1
  6. (6) Royal Holloway University of London, grid.4970.a
  7. (7) University of Toronto, grid.17063.33
  8. (8) University of Copenhagen, grid.5254.6, KU
  9. (9) University of Sussex, grid.12082.39
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  11. (11) Technion – Israel Institute of Technology, grid.6451.6
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  13. (13) King's College London, grid.13097.3c
  14. (14) International Centre for Theoretical Physics, grid.419330.c
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  139. (139) LAPP, Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS/IN2P3, Annecy, France
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Description

A measurement of the four-lepton invariant mass spectrum is made with the ATLAS detector, using an integrated luminosity of 36.1 fb−1 of proton-proton collisions at s = 13 TeV delivered by the Large Hadron Collider. The differential cross-section is measured for events containing two same-flavour opposite-sign lepton pairs. It exhibits a rich structure, with different mass regions dominated in the Standard Model by single Z boson production, Higgs boson production, and Z boson pair production, and non-negligible interference effects at high invariant masses. The measurement is compared with state-of-the-art Standard Model calculations, which are found to be consistent with the data. These calculations are used to interpret the data in terms of gg → ZZ → 4ℓ and Z → 4ℓ subprocesses, and to place constraints on a possible contribution from physics beyond the Standard Model.

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