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

Abstract

The search for the production of three massive vector bosons in proton$-$proton collisions, 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${}^{-1}$, is presented. 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.

7 pages, 2 figures, contribution to the proceedings of the Seventh Annual Conference on Large Hadron Collider Physics (LHCP2019). arXiv admin note: substantial text overlap with arXiv:1906.09170

References in corpus (3)

• Electron reconstruction and identification in the ATLAS experiment using the 2015 and 2016 LHC proton-proton collision data at $\sqrt{s}$ = 13 TeV
• Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detector
• Search for triboson $W^{\pm }{W}^{\pm }{W}^{\mp }$ production in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector

Cited by in corpus (2)

• Electroweak, QCD and flavour physics studies with ATLAS data from Run 2 of the LHC
• Observation of $VVZ$ production at $\sqrt{s}=13$ TeV with the ATLAS detector