Measurement of the Four-Lepton Invariant Mass Spectrum in 13 TeV Proton-Proton Collisions with the ATLAS Detector

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Authors

Aaboud, M.
Aad, G.
Abbott, B.
Abdinov, O.
Abeloos, B.
Abhayasinghe, D. K.
Abidi, S. H.
Izen, Joseph M.
Meirose, Bernhard
Reeves, Kendall

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Springer Verlag

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Abstract

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. ©2019 The Author(s).

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Keywords

Leptons (Nuclear physics), Proton-proton interactions, Large Hadron Collider (France and Switzerland), Standard model (Nuclear physics), Z bosons, Higgs bosons

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CC BY 4.0 (Attribution), ©2019 The Authors

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