Observation of $WWW$ Production in $pp$ Collisions at $\sqrt{s}=13$ TeV with the ATLAS Detector

Abstract

This Letter reports the observation of $WWW$ production and a measurement of its cross section using 139 fb${}^{-1}$ of proton-proton collision data recorded at a center-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. Events with two same-sign leptons (electrons or muons) and at least two jets, as well as events with three charged leptons, are selected. A multivariate technique is then used to discriminate between signal and background events. Events from $WWW$ production are observed with a significance of 8.0 standard deviations, where the expectation is 5.4 standard deviations. The inclusive $WWW$ production cross section is measured to be $820\pm 100\text{(stat)}\pm 80\text{(syst)}$ fb, approximately 2.6 standard deviations from the predicted cross section of $511\pm 18$ fb calculated at next-to-leading-order QCD and leading-order electroweak accuracy.

arXiv comment28 pages with author list (author list starting on page 13), 2 figures, 1 table, published in PRL. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2019-09/

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