CMSPASEXO21015  
Search for a neutral gauge boson with nonuniversal fermion couplings in vector boson fusion processes in protonproton collisions at $ \sqrt{s}= $ 13 TeV  
CMS Collaboration  
4 June 2024  
Abstract: The first search for a heavy neutral spin1 gauge boson (Z') produced via vector boson fusion processes is presented. The analysis considers scenarios in which the Z' boson has nonuniversal fermion couplings, favoring highergeneration fermions. This offers a new physics phase space not yet fully explored at the LHC. The analysis is performed using LHC data at $ \sqrt{s}= $ 13 TeV, collected from 2016 to 2018, corresponding to an integrated luminosity of 138 fb$ ^{1} $. The data are consistent with the standard model expectation. Upper limits are set on the product of the Z' cross section and the branching fraction for a Z' boson decaying to $ \tau\tau $ or WW. Masses below 2.45 TeV are excluded, depending on the Z' coupling to weak bosons.  
Links: CDS record (PDF) ; CADI line (restricted) ; 
Figures  Summary  Additional Figures  References  CMS Publications 

Figures  
png pdf 
Figure 1:
Observed $ m(\ell_{1},\ell_{2},p_{\mathrm{T}}^\text{miss}) $ for the data, and the postfit backgrounds (stacked histograms), in the signal region for $ \mu\tau_\mathrm{h} $ (upper left), $ \tau_\mathrm{h}\tau_\mathrm{h} $ (upper right), $ \mathrm{e}\tau_\mathrm{h} $ (lower left), and $ \mathrm{e}\mu $ (lower right) channels. The lower panels show ratios of the data to the prefit background prediction and postfit background yield as red open squares and blue points, respectively. The gray band in the lower panels indicates the systematic component of the postfit uncertainty. The dashed lines correspond to the signal expectation, for Z' masses of 1 TeV (black) and 2.5 TeV (magenta) decaying to $ \tau^{+}\tau^{} $, normalized to 199.4 fb and 0.7504 fb respectively. The dashed brown line corresponds to Z' mass of 1.25 TeV decaying to $ \mathrm{W^+}\mathrm{W^} $, normalized to 61.14 fb. 
png pdf 
Figure 1a:
Observed $ m(\ell_{1},\ell_{2},p_{\mathrm{T}}^\text{miss}) $ for the data, and the postfit backgrounds (stacked histograms), in the signal region for $ \mu\tau_\mathrm{h} $ (upper left), $ \tau_\mathrm{h}\tau_\mathrm{h} $ (upper right), $ \mathrm{e}\tau_\mathrm{h} $ (lower left), and $ \mathrm{e}\mu $ (lower right) channels. The lower panels show ratios of the data to the prefit background prediction and postfit background yield as red open squares and blue points, respectively. The gray band in the lower panels indicates the systematic component of the postfit uncertainty. The dashed lines correspond to the signal expectation, for Z' masses of 1 TeV (black) and 2.5 TeV (magenta) decaying to $ \tau^{+}\tau^{} $, normalized to 199.4 fb and 0.7504 fb respectively. The dashed brown line corresponds to Z' mass of 1.25 TeV decaying to $ \mathrm{W^+}\mathrm{W^} $, normalized to 61.14 fb. 
png pdf 
Figure 1b:
Observed $ m(\ell_{1},\ell_{2},p_{\mathrm{T}}^\text{miss}) $ for the data, and the postfit backgrounds (stacked histograms), in the signal region for $ \mu\tau_\mathrm{h} $ (upper left), $ \tau_\mathrm{h}\tau_\mathrm{h} $ (upper right), $ \mathrm{e}\tau_\mathrm{h} $ (lower left), and $ \mathrm{e}\mu $ (lower right) channels. The lower panels show ratios of the data to the prefit background prediction and postfit background yield as red open squares and blue points, respectively. The gray band in the lower panels indicates the systematic component of the postfit uncertainty. The dashed lines correspond to the signal expectation, for Z' masses of 1 TeV (black) and 2.5 TeV (magenta) decaying to $ \tau^{+}\tau^{} $, normalized to 199.4 fb and 0.7504 fb respectively. The dashed brown line corresponds to Z' mass of 1.25 TeV decaying to $ \mathrm{W^+}\mathrm{W^} $, normalized to 61.14 fb. 
png pdf 
Figure 1c:
Observed $ m(\ell_{1},\ell_{2},p_{\mathrm{T}}^\text{miss}) $ for the data, and the postfit backgrounds (stacked histograms), in the signal region for $ \mu\tau_\mathrm{h} $ (upper left), $ \tau_\mathrm{h}\tau_\mathrm{h} $ (upper right), $ \mathrm{e}\tau_\mathrm{h} $ (lower left), and $ \mathrm{e}\mu $ (lower right) channels. The lower panels show ratios of the data to the prefit background prediction and postfit background yield as red open squares and blue points, respectively. The gray band in the lower panels indicates the systematic component of the postfit uncertainty. The dashed lines correspond to the signal expectation, for Z' masses of 1 TeV (black) and 2.5 TeV (magenta) decaying to $ \tau^{+}\tau^{} $, normalized to 199.4 fb and 0.7504 fb respectively. The dashed brown line corresponds to Z' mass of 1.25 TeV decaying to $ \mathrm{W^+}\mathrm{W^} $, normalized to 61.14 fb. 
png pdf 
Figure 1d:
Observed $ m(\ell_{1},\ell_{2},p_{\mathrm{T}}^\text{miss}) $ for the data, and the postfit backgrounds (stacked histograms), in the signal region for $ \mu\tau_\mathrm{h} $ (upper left), $ \tau_\mathrm{h}\tau_\mathrm{h} $ (upper right), $ \mathrm{e}\tau_\mathrm{h} $ (lower left), and $ \mathrm{e}\mu $ (lower right) channels. The lower panels show ratios of the data to the prefit background prediction and postfit background yield as red open squares and blue points, respectively. The gray band in the lower panels indicates the systematic component of the postfit uncertainty. The dashed lines correspond to the signal expectation, for Z' masses of 1 TeV (black) and 2.5 TeV (magenta) decaying to $ \tau^{+}\tau^{} $, normalized to 199.4 fb and 0.7504 fb respectively. The dashed brown line corresponds to Z' mass of 1.25 TeV decaying to $ \mathrm{W^+}\mathrm{W^} $, normalized to 61.14 fb. 
png pdf 
Figure 2:
Combined 95% CL upper limits on $ m({\mathrm{Z}^{'}} ) $ as a function of Z' branching fraction to $ \tau^{+}\tau^{} $ for the $ g_{\ell} = $ 0 scenario (upper left), $ \tau^{+}\tau^{} $ for the $ g_{\ell} = $ 1 scenario (upper right), $ \mathrm{W^+}\mathrm{W^} $ for the $ g_{\ell} = $ 0 scenario (lower left), and $ \mathrm{W^+}\mathrm{W^} $ for the $ g_{\ell} = $ 1 scenario (lower right). The red, green and blue curves correspond to $ \kappa_{\mathrm{V}} $ equal to 0.1, 0.5 and 1 respectively. 
png pdf 
Figure 2a:
Combined 95% CL upper limits on $ m({\mathrm{Z}^{'}} ) $ as a function of Z' branching fraction to $ \tau^{+}\tau^{} $ for the $ g_{\ell} = $ 0 scenario (upper left), $ \tau^{+}\tau^{} $ for the $ g_{\ell} = $ 1 scenario (upper right), $ \mathrm{W^+}\mathrm{W^} $ for the $ g_{\ell} = $ 0 scenario (lower left), and $ \mathrm{W^+}\mathrm{W^} $ for the $ g_{\ell} = $ 1 scenario (lower right). The red, green and blue curves correspond to $ \kappa_{\mathrm{V}} $ equal to 0.1, 0.5 and 1 respectively. 
png pdf 
Figure 2b:
Combined 95% CL upper limits on $ m({\mathrm{Z}^{'}} ) $ as a function of Z' branching fraction to $ \tau^{+}\tau^{} $ for the $ g_{\ell} = $ 0 scenario (upper left), $ \tau^{+}\tau^{} $ for the $ g_{\ell} = $ 1 scenario (upper right), $ \mathrm{W^+}\mathrm{W^} $ for the $ g_{\ell} = $ 0 scenario (lower left), and $ \mathrm{W^+}\mathrm{W^} $ for the $ g_{\ell} = $ 1 scenario (lower right). The red, green and blue curves correspond to $ \kappa_{\mathrm{V}} $ equal to 0.1, 0.5 and 1 respectively. 
png pdf 
Figure 2c:
Combined 95% CL upper limits on $ m({\mathrm{Z}^{'}} ) $ as a function of Z' branching fraction to $ \tau^{+}\tau^{} $ for the $ g_{\ell} = $ 0 scenario (upper left), $ \tau^{+}\tau^{} $ for the $ g_{\ell} = $ 1 scenario (upper right), $ \mathrm{W^+}\mathrm{W^} $ for the $ g_{\ell} = $ 0 scenario (lower left), and $ \mathrm{W^+}\mathrm{W^} $ for the $ g_{\ell} = $ 1 scenario (lower right). The red, green and blue curves correspond to $ \kappa_{\mathrm{V}} $ equal to 0.1, 0.5 and 1 respectively. 
png pdf 
Figure 2d:
Combined 95% CL upper limits on $ m({\mathrm{Z}^{'}} ) $ as a function of Z' branching fraction to $ \tau^{+}\tau^{} $ for the $ g_{\ell} = $ 0 scenario (upper left), $ \tau^{+}\tau^{} $ for the $ g_{\ell} = $ 1 scenario (upper right), $ \mathrm{W^+}\mathrm{W^} $ for the $ g_{\ell} = $ 0 scenario (lower left), and $ \mathrm{W^+}\mathrm{W^} $ for the $ g_{\ell} = $ 1 scenario (lower right). The red, green and blue curves correspond to $ \kappa_{\mathrm{V}} $ equal to 0.1, 0.5 and 1 respectively. 
Summary 
In summary, a search for a heavy neutral spin1 gauge boson (Z') produced via vector boson fusion processes has been performed for the first time using data collected by the CMS experiment, corresponding to an integrated luminosity of 138 fb$^{1}$. This is the first ever search for Z' produced through vector boson fusion performed at the LHC. The search considers nonuniversal couplings (NUC) of Z' bosons to fermions, including scenarios with dominant couplings to thirdgeneration fermions. Theoretical models aiming to explain Bmeson anomalies in the $ R_{D^{*}} $ ratios [68,69,70,71,72,73] often include associated production of Z' and W' bosons with NUC [74,75]. Therefore, this search serves as an indirect probe to bound the available phase space for these models. Two decay channels, $ {\mathrm{Z}^{'}} \to\tau^{+}\tau^{} $ and $ {\mathrm{Z}^{'}} \to\mathrm{W^+}\mathrm{W^} $, are considered, motivated by recent anomalies in the precision measurements of B meson decays. The invariant mass of the dilepton plus missing transverse momentum is used to search for the presence of signal as a broad enhancement above the background expectation. The data do not reveal evidence for new physics. In Z' models with nonuniversal fermion couplings, in particular models with Z' bosons that exhibit enhanced couplings to thirdgeneration fermions, the presence of Z' bosons decaying to a tau lepton (W boson) pair is excluded for Z' masses up to 2.45 TeV (1.5 TeV), depending on the Z' coupling to SM weak bosons, resulting in the most stringent limits on these models to date. 
Additional Figures  
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Additional Figure 2:
The cumulative efficiency of the signal region selections in the $ \mu\tau_\mathrm{h} $ channel, for the VBF $ \mathrm{Z'}\to\tau\tau $ (left) and $ \mathrm{Z'}\to\mathrm{WW} $ (right) signal models with $ \kappa_{\mathrm{V}} = $ 1.0, as a function of Z' mass. The red curve represents the $ g_{\ell} = $ 0, $ g_{\text{h}} = $ 1 scenario, and the blue curve represents the $ g_{\ell} = g_{\text{h}} = $ 1 scenario. Each value is computed as the ratio of the number of simulated signal events passing all selection criteria to the total number of simulated signal events. 
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Additional Figure 2a:
The cumulative efficiency of the signal region selections in the $ \mu\tau_\mathrm{h} $ channel, for the VBF $ \mathrm{Z'}\to\tau\tau $ (left) and $ \mathrm{Z'}\to\mathrm{WW} $ (right) signal models with $ \kappa_{\mathrm{V}} = $ 1.0, as a function of Z' mass. The red curve represents the $ g_{\ell} = $ 0, $ g_{\text{h}} = $ 1 scenario, and the blue curve represents the $ g_{\ell} = g_{\text{h}} = $ 1 scenario. Each value is computed as the ratio of the number of simulated signal events passing all selection criteria to the total number of simulated signal events. 
png pdf 
Additional Figure 2b:
The cumulative efficiency of the signal region selections in the $ \mu\tau_\mathrm{h} $ channel, for the VBF $ \mathrm{Z'}\to\tau\tau $ (left) and $ \mathrm{Z'}\to\mathrm{WW} $ (right) signal models with $ \kappa_{\mathrm{V}} = $ 1.0, as a function of Z' mass. The red curve represents the $ g_{\ell} = $ 0, $ g_{\text{h}} = $ 1 scenario, and the blue curve represents the $ g_{\ell} = g_{\text{h}} = $ 1 scenario. Each value is computed as the ratio of the number of simulated signal events passing all selection criteria to the total number of simulated signal events. 
png pdf 
Additional Figure 3:
The cumulative efficiency of the signal region selections in the $ \mathrm{e}\tau_\mathrm{h} $ channel, for the VBF $ \mathrm{Z'}\to\tau\tau $ (left) and $ \mathrm{Z'}\to\mathrm{WW} $ (right) signal models with $ \kappa_{\mathrm{V}} = $ 1.0, as a function of Z' mass. The red curve represents the $ g_{\ell} = $ 0, $ g_{\text{h}} = $ 1 scenario, and the blue curve represents the $ g_{\ell} = g_{\text{h}} = $ 1 scenario. Each value is computed as the ratio of the number of simulated signal events passing all selection criteria to the total number of simulated signal events. 
png pdf 
Additional Figure 3a:
The cumulative efficiency of the signal region selections in the $ \mathrm{e}\tau_\mathrm{h} $ channel, for the VBF $ \mathrm{Z'}\to\tau\tau $ (left) and $ \mathrm{Z'}\to\mathrm{WW} $ (right) signal models with $ \kappa_{\mathrm{V}} = $ 1.0, as a function of Z' mass. The red curve represents the $ g_{\ell} = $ 0, $ g_{\text{h}} = $ 1 scenario, and the blue curve represents the $ g_{\ell} = g_{\text{h}} = $ 1 scenario. Each value is computed as the ratio of the number of simulated signal events passing all selection criteria to the total number of simulated signal events. 
png pdf 
Additional Figure 3b:
The cumulative efficiency of the signal region selections in the $ \mathrm{e}\tau_\mathrm{h} $ channel, for the VBF $ \mathrm{Z'}\to\tau\tau $ (left) and $ \mathrm{Z'}\to\mathrm{WW} $ (right) signal models with $ \kappa_{\mathrm{V}} = $ 1.0, as a function of Z' mass. The red curve represents the $ g_{\ell} = $ 0, $ g_{\text{h}} = $ 1 scenario, and the blue curve represents the $ g_{\ell} = g_{\text{h}} = $ 1 scenario. Each value is computed as the ratio of the number of simulated signal events passing all selection criteria to the total number of simulated signal events. 
png pdf 
Additional Figure 4:
The cumulative efficiency of the signal region selections in the $ \mathrm{e}\mu $ channel, for the VBF $ \mathrm{Z'}\to\tau\tau $ (left) and $ \mathrm{Z'}\to\mathrm{WW} $ (right) signal models with $ \kappa_{\mathrm{V}} = $ 1.0, as a function of Z' mass. The red curve represents the $ g_{\ell} = $ 0, $ g_{\text{h}} = $ 1 scenario, and the blue curve represents the $ g_{\ell} = g_{\text{h}} = $ 1 scenario. Each value is computed as the ratio of the number of simulated signal events passing all selection criteria to the total number of simulated signal events. 
png pdf 
Additional Figure 4a:
The cumulative efficiency of the signal region selections in the $ \mathrm{e}\mu $ channel, for the VBF $ \mathrm{Z'}\to\tau\tau $ (left) and $ \mathrm{Z'}\to\mathrm{WW} $ (right) signal models with $ \kappa_{\mathrm{V}} = $ 1.0, as a function of Z' mass. The red curve represents the $ g_{\ell} = $ 0, $ g_{\text{h}} = $ 1 scenario, and the blue curve represents the $ g_{\ell} = g_{\text{h}} = $ 1 scenario. Each value is computed as the ratio of the number of simulated signal events passing all selection criteria to the total number of simulated signal events. 
png pdf 
Additional Figure 4b:
The cumulative efficiency of the signal region selections in the $ \mathrm{e}\mu $ channel, for the VBF $ \mathrm{Z'}\to\tau\tau $ (left) and $ \mathrm{Z'}\to\mathrm{WW} $ (right) signal models with $ \kappa_{\mathrm{V}} = $ 1.0, as a function of Z' mass. The red curve represents the $ g_{\ell} = $ 0, $ g_{\text{h}} = $ 1 scenario, and the blue curve represents the $ g_{\ell} = g_{\text{h}} = $ 1 scenario. Each value is computed as the ratio of the number of simulated signal events passing all selection criteria to the total number of simulated signal events. 
png pdf 
Additional Figure 5:
The reconstructed Z' mass distribution $ m(\ell,\ell,p_{\mathrm{T}}^{\text{miss}}) $ in the $ \tau_\mathrm{h} \tau_\mathrm{h} $ (top left), $ \mu\tau_\mathrm{h} $ (top right), $ \mathrm{e}\tau_\mathrm{h} $ (bottom left), and $ \mathrm{e}\mu $ (bottom right) channels for simulated VBF $ \mathrm{Z'}\to\tau\tau $ benchmark signal samples with $ m(\mathrm{Z'}) = $ 0.25, 0.5, 1.5, and 2.5 TeV. 
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Additional Figure 5a:
The reconstructed Z' mass distribution $ m(\ell,\ell,p_{\mathrm{T}}^{\text{miss}}) $ in the $ \tau_\mathrm{h} \tau_\mathrm{h} $ (top left), $ \mu\tau_\mathrm{h} $ (top right), $ \mathrm{e}\tau_\mathrm{h} $ (bottom left), and $ \mathrm{e}\mu $ (bottom right) channels for simulated VBF $ \mathrm{Z'}\to\tau\tau $ benchmark signal samples with $ m(\mathrm{Z'}) = $ 0.25, 0.5, 1.5, and 2.5 TeV. 
png pdf 
Additional Figure 5b:
The reconstructed Z' mass distribution $ m(\ell,\ell,p_{\mathrm{T}}^{\text{miss}}) $ in the $ \tau_\mathrm{h} \tau_\mathrm{h} $ (top left), $ \mu\tau_\mathrm{h} $ (top right), $ \mathrm{e}\tau_\mathrm{h} $ (bottom left), and $ \mathrm{e}\mu $ (bottom right) channels for simulated VBF $ \mathrm{Z'}\to\tau\tau $ benchmark signal samples with $ m(\mathrm{Z'}) = $ 0.25, 0.5, 1.5, and 2.5 TeV. 
png pdf 
Additional Figure 5c:
The reconstructed Z' mass distribution $ m(\ell,\ell,p_{\mathrm{T}}^{\text{miss}}) $ in the $ \tau_\mathrm{h} \tau_\mathrm{h} $ (top left), $ \mu\tau_\mathrm{h} $ (top right), $ \mathrm{e}\tau_\mathrm{h} $ (bottom left), and $ \mathrm{e}\mu $ (bottom right) channels for simulated VBF $ \mathrm{Z'}\to\tau\tau $ benchmark signal samples with $ m(\mathrm{Z'}) = $ 0.25, 0.5, 1.5, and 2.5 TeV. 
png pdf 
Additional Figure 5d:
The reconstructed Z' mass distribution $ m(\ell,\ell,p_{\mathrm{T}}^{\text{miss}}) $ in the $ \tau_\mathrm{h} \tau_\mathrm{h} $ (top left), $ \mu\tau_\mathrm{h} $ (top right), $ \mathrm{e}\tau_\mathrm{h} $ (bottom left), and $ \mathrm{e}\mu $ (bottom right) channels for simulated VBF $ \mathrm{Z'}\to\tau\tau $ benchmark signal samples with $ m(\mathrm{Z'}) = $ 0.25, 0.5, 1.5, and 2.5 TeV. 
png pdf 
Additional Figure 6:
The combined 95% confidence level expected and observed upper limits on the product of the Z' cross section and the branching fraction for a Z' boson decaying to $ \tau\tau $, as a function of Z' mass and assuming $ g_{\ell} = $ 0 and $ \kappa_{\mathrm{V}} = $ 0.1 (top left), 0.25 (top right), 0.5 (bottom left), and 1.0 (bottom right). 
png pdf 
Additional Figure 6a:
The combined 95% confidence level expected and observed upper limits on the product of the Z' cross section and the branching fraction for a Z' boson decaying to $ \tau\tau $, as a function of Z' mass and assuming $ g_{\ell} = $ 0 and $ \kappa_{\mathrm{V}} = $ 0.1 (top left), 0.25 (top right), 0.5 (bottom left), and 1.0 (bottom right). 
png pdf 
Additional Figure 6b:
The combined 95% confidence level expected and observed upper limits on the product of the Z' cross section and the branching fraction for a Z' boson decaying to $ \tau\tau $, as a function of Z' mass and assuming $ g_{\ell} = $ 0 and $ \kappa_{\mathrm{V}} = $ 0.1 (top left), 0.25 (top right), 0.5 (bottom left), and 1.0 (bottom right). 
png pdf 
Additional Figure 6c:
The combined 95% confidence level expected and observed upper limits on the product of the Z' cross section and the branching fraction for a Z' boson decaying to $ \tau\tau $, as a function of Z' mass and assuming $ g_{\ell} = $ 0 and $ \kappa_{\mathrm{V}} = $ 0.1 (top left), 0.25 (top right), 0.5 (bottom left), and 1.0 (bottom right). 
png pdf 
Additional Figure 6d:
The combined 95% confidence level expected and observed upper limits on the product of the Z' cross section and the branching fraction for a Z' boson decaying to $ \tau\tau $, as a function of Z' mass and assuming $ g_{\ell} = $ 0 and $ \kappa_{\mathrm{V}} = $ 0.1 (top left), 0.25 (top right), 0.5 (bottom left), and 1.0 (bottom right). 
png pdf 
Additional Figure 7:
The combined 95% confidence level expected and observed upper limits on the product of the Z' cross section and the branching fraction for a Z' boson decaying to $ \tau\tau $, as a function of Z' mass and assuming $ g_{\ell} = $ 1 and $ \kappa_{\mathrm{V}} = $ 0.1 (top left), 0.25 (top right), 0.5 (bottom left), and 1.0 (bottom right). 
png pdf 
Additional Figure 7a:
The combined 95% confidence level expected and observed upper limits on the product of the Z' cross section and the branching fraction for a Z' boson decaying to $ \tau\tau $, as a function of Z' mass and assuming $ g_{\ell} = $ 1 and $ \kappa_{\mathrm{V}} = $ 0.1 (top left), 0.25 (top right), 0.5 (bottom left), and 1.0 (bottom right). 
png pdf 
Additional Figure 7b:
The combined 95% confidence level expected and observed upper limits on the product of the Z' cross section and the branching fraction for a Z' boson decaying to $ \tau\tau $, as a function of Z' mass and assuming $ g_{\ell} = $ 1 and $ \kappa_{\mathrm{V}} = $ 0.1 (top left), 0.25 (top right), 0.5 (bottom left), and 1.0 (bottom right). 
png pdf 
Additional Figure 7c:
The combined 95% confidence level expected and observed upper limits on the product of the Z' cross section and the branching fraction for a Z' boson decaying to $ \tau\tau $, as a function of Z' mass and assuming $ g_{\ell} = $ 1 and $ \kappa_{\mathrm{V}} = $ 0.1 (top left), 0.25 (top right), 0.5 (bottom left), and 1.0 (bottom right). 
png pdf 
Additional Figure 7d:
The combined 95% confidence level expected and observed upper limits on the product of the Z' cross section and the branching fraction for a Z' boson decaying to $ \tau\tau $, as a function of Z' mass and assuming $ g_{\ell} = $ 1 and $ \kappa_{\mathrm{V}} = $ 0.1 (top left), 0.25 (top right), 0.5 (bottom left), and 1.0 (bottom right). 
png pdf 
Additional Figure 8:
The combined 95% confidence level expected and observed upper limits on the product of the Z' cross section and the branching fraction for a Z' boson decaying to $ \mathrm{WW} $, as a function of Z' mass and assuming $ g_{\ell} = $ 0 and $ \kappa_{\mathrm{V}} = $ 0.1 (top left), 0.25 (top right), 0.5 (bottom left), and 1.0 (bottom right). 
png pdf 
Additional Figure 8a:
The combined 95% confidence level expected and observed upper limits on the product of the Z' cross section and the branching fraction for a Z' boson decaying to $ \mathrm{WW} $, as a function of Z' mass and assuming $ g_{\ell} = $ 0 and $ \kappa_{\mathrm{V}} = $ 0.1 (top left), 0.25 (top right), 0.5 (bottom left), and 1.0 (bottom right). 
png pdf 
Additional Figure 8b:
The combined 95% confidence level expected and observed upper limits on the product of the Z' cross section and the branching fraction for a Z' boson decaying to $ \mathrm{WW} $, as a function of Z' mass and assuming $ g_{\ell} = $ 0 and $ \kappa_{\mathrm{V}} = $ 0.1 (top left), 0.25 (top right), 0.5 (bottom left), and 1.0 (bottom right). 
png pdf 
Additional Figure 8c:
The combined 95% confidence level expected and observed upper limits on the product of the Z' cross section and the branching fraction for a Z' boson decaying to $ \mathrm{WW} $, as a function of Z' mass and assuming $ g_{\ell} = $ 0 and $ \kappa_{\mathrm{V}} = $ 0.1 (top left), 0.25 (top right), 0.5 (bottom left), and 1.0 (bottom right). 
png pdf 
Additional Figure 8d:
The combined 95% confidence level expected and observed upper limits on the product of the Z' cross section and the branching fraction for a Z' boson decaying to $ \mathrm{WW} $, as a function of Z' mass and assuming $ g_{\ell} = $ 0 and $ \kappa_{\mathrm{V}} = $ 0.1 (top left), 0.25 (top right), 0.5 (bottom left), and 1.0 (bottom right). 
png pdf 
Additional Figure 9:
The combined 95% confidence level expected and observed upper limits on the product of the Z' cross section and the branching fraction for a Z' boson decaying to $ \mathrm{WW} $, as a function of Z' mass and assuming $ g_{\ell} = $ 1 and $ \kappa_{\mathrm{V}} = $ 0.1 (top left), 0.25 (top right), 0.5 (bottom left), and 1.0 (bottom right). 
png pdf 
Additional Figure 9a:
The combined 95% confidence level expected and observed upper limits on the product of the Z' cross section and the branching fraction for a Z' boson decaying to $ \mathrm{WW} $, as a function of Z' mass and assuming $ g_{\ell} = $ 1 and $ \kappa_{\mathrm{V}} = $ 0.1 (top left), 0.25 (top right), 0.5 (bottom left), and 1.0 (bottom right). 
png pdf 
Additional Figure 9b:
The combined 95% confidence level expected and observed upper limits on the product of the Z' cross section and the branching fraction for a Z' boson decaying to $ \mathrm{WW} $, as a function of Z' mass and assuming $ g_{\ell} = $ 1 and $ \kappa_{\mathrm{V}} = $ 0.1 (top left), 0.25 (top right), 0.5 (bottom left), and 1.0 (bottom right). 
png pdf 
Additional Figure 9c:
The combined 95% confidence level expected and observed upper limits on the product of the Z' cross section and the branching fraction for a Z' boson decaying to $ \mathrm{WW} $, as a function of Z' mass and assuming $ g_{\ell} = $ 1 and $ \kappa_{\mathrm{V}} = $ 0.1 (top left), 0.25 (top right), 0.5 (bottom left), and 1.0 (bottom right). 
png pdf 
Additional Figure 9d:
The combined 95% confidence level expected and observed upper limits on the product of the Z' cross section and the branching fraction for a Z' boson decaying to $ \mathrm{WW} $, as a function of Z' mass and assuming $ g_{\ell} = $ 1 and $ \kappa_{\mathrm{V}} = $ 0.1 (top left), 0.25 (top right), 0.5 (bottom left), and 1.0 (bottom right). 
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