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Observation of the Production of Three Massive Gauge Bosons at $\sqrt {s}$ =13 TeV

The CMS collaboration
Phys.Rev.Lett. 125 (2020) 151802, 2020.

Abstract (data abstract)
The first observation is reported of the combined production of three massive gauge bosons (VVV with V = W, Z) in proton-proton collisions at a center-of-mass energy of 13~TeV. The analysis is based on a data sample recorded by the CMS experiment at the CERN LHC corresponding to an integrated luminosity of $137~\mathrm{fb}^{-1}$. The searches for individual WWW, WWZ, WZZ, and ZZZ production are performed in final states with three, four, five, and six leptons (electrons or muons), or with two same-sign leptons plus one or two jets. The observed (expected) significance of the combined VVV production signal is 5.7\,(5.9) standard deviations and the corresponding measured cross section relative to the standard model prediction is $1.02^{+0.26}_{-0.23}$. The significances of the individual WWW and WWZ production are 3.3 and 3.4 standard deviations, respectively. Measured production cross sections for the individual triboson processes are also reported.

  • Figure 1: Same-sign, 3 leptons

    Data from Figure 1.

    10.17182/hepdata.95926.v1/t1

    Comparison of the observed numbers of events to the predicted yields after fitting. For the WWW and WWZ channels, the...

  • Figure 1: 4, 5, 6 leptons

    Data from Figure 1.

    10.17182/hepdata.95926.v1/t2

    Comparison of the observed numbers of events to the predicted yields after fitting. For the WWW and WWZ channels, the...

  • Figure 2

    Data from Figure 2

    10.17182/hepdata.95926.v1/t3

    Best fit values of the signal strengths for the BDT-based analyses (blue solid circles) and the sequential-cut analyses (black open...

  • Table 1

    Data from Table 1

    10.17182/hepdata.95926.v1/t4

    Measured cross sections obtained with the BDT-based analyses. The uncertainties listed are statistical and systematic. For the results listed in...

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