Evidence for the production of three massive vector bosons with the ATLAS detector

Abstract

A search for the production of three massive vector bosons in proton-proton collisions is performed using data at $\sqrt{s}=13$ TeV recorded with the ATLAS detector at the Large Hadron Collider in the years 2015-2017, corresponding to an integrated luminosity of $79.8$ fb${}^{-1}$. Events with two same-sign leptons $\ell$ (electrons or muons) and at least two reconstructed jets are selected to search for $WWW\to \ell \nu \ell \nu qq$. Events with three leptons without any same-flavour opposite-sign lepton pairs are used to search for $WWW\to \ell \nu \ell \nu \ell \nu$, while events with three leptons and at least one same-flavour opposite-sign lepton pair and one or more reconstructed jets are used to search for $WWZ\to \ell \nu qq\ell \ell$. Finally, events with four leptons are analysed to search for $WWZ\to \ell \nu \ell \nu \ell \ell$ and $WZZ\to qq\ell \ell \ell \ell$. Evidence for the joint production of three massive vector bosons is observed with a significance of 4.1 standard deviations, where the expectation is 3.1 standard deviations.

arXiv comment38 pages in total, author list starting page 22, 6 figures, 5 tables, matching published paper in Phys. Lett. B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2017-22

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• New physics in triboson event topologies