Abstract

The first evidence for the standard model production of a top quark in association with a W boson and a Z boson is reported. The measurement is performed in multilepton final states, where the Z boson is reconstructed via its decays to electron or muon pairs and the W boson decays either to leptons or hadrons. The analysed data were recorded by the CMS experiment at the CERN LHC in 2016-2018 in proton-proton collisions at $\sqrt{s}$ = 13 TeV, and correspond to an integrated luminosity of 138 fb$^{-1}$. The measured cross section is 354 $\pm$ 54 (stat) $\pm$ 95 (syst) fb, and corresponds to a statistical significance of 3.4 standard deviations.

Tables 1 and 2

Example location

10.17182/hepdata.138419.v1/t1

Expected yields for signal and background processes and observed number of events in the signal and control regions
Figure 3 (lower right)

Example location

10.17182/hepdata.138419.v1/t2

Postfit b jet multiplicity distribution in the $\text{SR}_\text{4l}$
Figure 3 (upper left)

Example location

10.17182/hepdata.138419.v1/t3

Postfit score of the tWZ output node from the multiclass classifier in $\text{SR}_\text{3l,3j}$ for events with exactly 1 b jet
Figure 3 (upper right)

Example location

10.17182/hepdata.138419.v1/t4

Postfit score of the $\text{t}\bar{\text{t}}\text{Z}$ output node from the multiclass classifier in $\text{SR}_\text{3l,3j}$ for events with at least 2 b...
Figure 3 (lower left)

Example location

10.17182/hepdata.138419.v1/t5

Postfit score of the tWZ output node from the binary classifier in $\text{SR}_\text{3l,2j}$
Figure 2 (lower right)

Example location

10.17182/hepdata.138419.v1/t6

$\text{p}_\text{T}$ of the leading jet in the $\text{SR}_\text{3l,2j}$
Figure 2 (lower left)

Example location

10.17182/hepdata.138419.v1/t7

$\text{p}_\text{T}$ of the leading lepton in the $\text{SR}_\text{3l,2j}$
Figure 2 (upper left)

Example location

10.17182/hepdata.138419.v1/t8

Max $\text{p}_\text{T}$ of the lepton-jet in the $\text{SR}_\text{3l,3j}$
Figure 2 (upper right)

Example location

10.17182/hepdata.138419.v1/t9

Invariant mass of the system of leptons, jets, and $\vec{\text{p}}^\text{miss}_\text{T}$ in the $\text{SR}_\text{3l,3j}$
Figure 4

Example location

10.17182/hepdata.138419.v1/t10

Two-dimensional likelihood scan of the signal strenghts of tWZ ($\mu_\text{tWZ}$) vs. $\text{t}\bar{\text{t}}\text{Z}$ ($\mu_{\text{t}\bar{\text{t}}\text{Z}}$). The blue lines show the 68%, 95%,...
Figure 4 limits

Example location

10.17182/hepdata.138419.v1/t11

Two-dimensional likelihood scan of the signal strenghts of tWZ ($\mu_\text{tWZ}$) vs. $\text{t}\bar{\text{t}}\text{Z}$ ($\mu_{\text{t}\bar{\text{t}}\text{Z}}$). The blue lines show the 68%, 95%,...

Tables 1 and 2

Figure 3 (lower right)

Figure 3 (upper left)

Figure 3 (upper right)

Figure 3 (lower left)

Figure 2 (lower right)

Figure 2 (lower left)

Figure 2 (upper left)

Figure 2 (upper right)

Figure 4

Figure 4 limits

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