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

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 $\sqrt{s}$ = 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 $gg\to ZZ\to 4\ell$ and $Z\to 4\ell$ subprocesses, and to place constraints on a possible contribution from physics beyond the Standard Model.

51 pages in total, author list starting page 35, 15 figures, 3 tables, submitted to JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2017-09

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• SMEFT analysis of vector boson scattering and diboson data from the LHC Run II
• Measurements of pp $\to$ ZZ production cross sections and constraints on anomalous triple gauge couplings at $\sqrt{s}=$ 13 TeV
• Testing new physics models with global comparisons to collider measurements: the Contur toolkit
• Measurements of differential cross-sections in four-lepton events in 13 TeV proton-proton collisions with the ATLAS detector
• New sensitivity of current LHC measurements to vector-like quarks
• Next-to-next-to-leading order event generation for $Z$ boson pair production matched to parton shower
• Four lepton production in gluon fusion: off-shell Higgs effects in NLO QCD
• A study of collider signatures for two Higgs doublet models with a Pseudoscalar mediator to Dark Matter
• Off-shell Higgs production at the LHC as a probe of the trilinear Higgs coupling
• Probing Higgs portals with matrix-element based kinematic discriminants in $ZZ\to 4\ell$ production
• Dark Matter from Anomaly Cancellation at the LHC
• Higgs boson rapidity distribution in bottom annihilation at NNLL and beyond
• MeV scale model of SIMP dark matter, neutrino mass and leptogenesis