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| CMS-PAS-EXO-24-021 | ||
| Search for new charged gauge bosons in the e/$ \mu $ + p$ _\mathrm{T}^\mathrm{miss} $ channel using pp collisions at $ \sqrt{s} = $ 13.6 TeV | ||
| CMS Collaboration | ||
| 2026-03-17 | ||
| Abstract: A search for physics beyond the standard model in final states with an electron or muon and missing transverse momentum is presented. The analysis uses data from proton-proton collisions at a centre-of-mass energy of 13.6 TeV, collected with the CMS detector at the LHC in 2022 and 2023 and corresponding to an integrated luminosity of 62 fb$ ^{-1} $. The study is performed assuming the production of a W$ ^{'} $ boson as predicted by the sequential standard model and decaying into a muon or electron plus imbalanced p$ _\mathrm{T} $ in the event. Model independent limits are also reported. | ||
| Links: CDS record (PDF) ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Product of acceptance times efficiency for the simulated SSM $ \mathrm{W^{'}} $ signal, as a function of the $ \mathrm{W^{'}} $ mass, after all selection criteria are applied for the electron (purple markers) and the muon (blue markers) decay channels. The drop in signal efficiency at higher $ \mathrm{W^{'}} $ masses comes from the kinematic properties of off-shell $ \mathrm{W^{'}} $ boson production. At larger mass scales, the cross-section becomes increasingly dominated by off-shell events that populate the low-mass region. Consequently, a substantial fraction of these events is suppressed by trigger and offline $ p_{\mathrm{T}} $ selection criteria, resulting in a lower overall efficiency as the $ \mathrm{W^{'}} $ mass increases. |
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Figure 2:
Distributions for $ m_\mathrm{T} $ for the electron (left) and muon (right) decay channels for 2022 and 2023 data (black points) for a total integrated luminosity of $ {\cal L}=62 $fb$^{-1} $, together with the SM prediction (coloured histograms) after applying the complete selection criteria. Two signal distributions are presented, with contributions normalized to the data luminosity analyzed, corresponding to SSM $ \mathrm{W^{'}} $ boson masses of 3.6 and 5.6 TeV. The lower panels show the ratios of data to the SM prediction, and the shaded bands represent the per bin statistical plus systematic uncertainties. |
png pdf |
Figure 2-a:
Distributions for $ m_\mathrm{T} $ for the electron (left) and muon (right) decay channels for 2022 and 2023 data (black points) for a total integrated luminosity of $ {\cal L}=62 $fb$^{-1} $, together with the SM prediction (coloured histograms) after applying the complete selection criteria. Two signal distributions are presented, with contributions normalized to the data luminosity analyzed, corresponding to SSM $ \mathrm{W^{'}} $ boson masses of 3.6 and 5.6 TeV. The lower panels show the ratios of data to the SM prediction, and the shaded bands represent the per bin statistical plus systematic uncertainties. |
png pdf |
Figure 2-b:
Distributions for $ m_\mathrm{T} $ for the electron (left) and muon (right) decay channels for 2022 and 2023 data (black points) for a total integrated luminosity of $ {\cal L}=62 $fb$^{-1} $, together with the SM prediction (coloured histograms) after applying the complete selection criteria. Two signal distributions are presented, with contributions normalized to the data luminosity analyzed, corresponding to SSM $ \mathrm{W^{'}} $ boson masses of 3.6 and 5.6 TeV. The lower panels show the ratios of data to the SM prediction, and the shaded bands represent the per bin statistical plus systematic uncertainties. |
png pdf |
Figure 3:
Observed (solid line) and expected (dashed line) upper limits at 95% CL on the product $ \sigma_{\mathrm{W^{'}}} \mathcal{B}(\mathrm{W^{'}} \rightarrow\ell\nu) $ for an SSM $ \mathrm{W^{'}} $ model as a function of $ \mathrm{W^{'}} $ boson mass, derived for the electron (top left) and muon (top right) decay channels, and the combination of both channels (bottom) using 2022 and 2023 collected data. The shaded bands represent the one (green) and two (yellow) standard deviation uncertainty bands for the expected limits. The theoretical prediction for SSM at NNLO-QCD level is shown (blue line) with a narrow gray band corresponding to the PDF and $ \alpha_{s} $ uncertainties. |
png pdf |
Figure 3-a:
Observed (solid line) and expected (dashed line) upper limits at 95% CL on the product $ \sigma_{\mathrm{W^{'}}} \mathcal{B}(\mathrm{W^{'}} \rightarrow\ell\nu) $ for an SSM $ \mathrm{W^{'}} $ model as a function of $ \mathrm{W^{'}} $ boson mass, derived for the electron (top left) and muon (top right) decay channels, and the combination of both channels (bottom) using 2022 and 2023 collected data. The shaded bands represent the one (green) and two (yellow) standard deviation uncertainty bands for the expected limits. The theoretical prediction for SSM at NNLO-QCD level is shown (blue line) with a narrow gray band corresponding to the PDF and $ \alpha_{s} $ uncertainties. |
png pdf |
Figure 3-b:
Observed (solid line) and expected (dashed line) upper limits at 95% CL on the product $ \sigma_{\mathrm{W^{'}}} \mathcal{B}(\mathrm{W^{'}} \rightarrow\ell\nu) $ for an SSM $ \mathrm{W^{'}} $ model as a function of $ \mathrm{W^{'}} $ boson mass, derived for the electron (top left) and muon (top right) decay channels, and the combination of both channels (bottom) using 2022 and 2023 collected data. The shaded bands represent the one (green) and two (yellow) standard deviation uncertainty bands for the expected limits. The theoretical prediction for SSM at NNLO-QCD level is shown (blue line) with a narrow gray band corresponding to the PDF and $ \alpha_{s} $ uncertainties. |
png pdf |
Figure 3-c:
Observed (solid line) and expected (dashed line) upper limits at 95% CL on the product $ \sigma_{\mathrm{W^{'}}} \mathcal{B}(\mathrm{W^{'}} \rightarrow\ell\nu) $ for an SSM $ \mathrm{W^{'}} $ model as a function of $ \mathrm{W^{'}} $ boson mass, derived for the electron (top left) and muon (top right) decay channels, and the combination of both channels (bottom) using 2022 and 2023 collected data. The shaded bands represent the one (green) and two (yellow) standard deviation uncertainty bands for the expected limits. The theoretical prediction for SSM at NNLO-QCD level is shown (blue line) with a narrow gray band corresponding to the PDF and $ \alpha_{s} $ uncertainties. |
png pdf |
Figure 4:
The 95% CL observed (solid line) and expected (dashed line) model-independent cross section limits as a function of the $ M_\mathrm{T}^\mathrm{min} $ threshold for the electron decay channel (top left) and the muon decay channel (top right). The limits correspond to an integrated luminosity of 62 fb$ ^{-1} $. The one (green) and two (yellow) standard deviation uncertainty bands for the expected limits are shown. The lower plot shows the limits for the combination of both decay channels. |
png pdf |
Figure 4-a:
The 95% CL observed (solid line) and expected (dashed line) model-independent cross section limits as a function of the $ M_\mathrm{T}^\mathrm{min} $ threshold for the electron decay channel (top left) and the muon decay channel (top right). The limits correspond to an integrated luminosity of 62 fb$ ^{-1} $. The one (green) and two (yellow) standard deviation uncertainty bands for the expected limits are shown. The lower plot shows the limits for the combination of both decay channels. |
png pdf |
Figure 4-b:
The 95% CL observed (solid line) and expected (dashed line) model-independent cross section limits as a function of the $ M_\mathrm{T}^\mathrm{min} $ threshold for the electron decay channel (top left) and the muon decay channel (top right). The limits correspond to an integrated luminosity of 62 fb$ ^{-1} $. The one (green) and two (yellow) standard deviation uncertainty bands for the expected limits are shown. The lower plot shows the limits for the combination of both decay channels. |
png pdf |
Figure 4-c:
The 95% CL observed (solid line) and expected (dashed line) model-independent cross section limits as a function of the $ M_\mathrm{T}^\mathrm{min} $ threshold for the electron decay channel (top left) and the muon decay channel (top right). The limits correspond to an integrated luminosity of 62 fb$ ^{-1} $. The one (green) and two (yellow) standard deviation uncertainty bands for the expected limits are shown. The lower plot shows the limits for the combination of both decay channels. |
png pdf |
Figure 5:
Observed (solid line) and expected (dashed line) upper limits at 95% CL on the coupling strength ratio, $ g_{\mathrm{W^{'}}}/g_{\mathrm{W}} $ as a function of the mass of the $ \mathrm{W^{'}} $ boson. They are shown for the electron (left) and muon (right) channels. The one and two standard deviation uncertainty bands for the expected limits are shown. The area above the limit curve is excluded. The dotted line represents the case of the SSM $ \mathrm{W^{'}} $ coupling, $ g_{\mathrm{W^{'}}} $, being equal to $ g_{\mathrm{W}} $, the SM coupling. |
png pdf |
Figure 5-a:
Observed (solid line) and expected (dashed line) upper limits at 95% CL on the coupling strength ratio, $ g_{\mathrm{W^{'}}}/g_{\mathrm{W}} $ as a function of the mass of the $ \mathrm{W^{'}} $ boson. They are shown for the electron (left) and muon (right) channels. The one and two standard deviation uncertainty bands for the expected limits are shown. The area above the limit curve is excluded. The dotted line represents the case of the SSM $ \mathrm{W^{'}} $ coupling, $ g_{\mathrm{W^{'}}} $, being equal to $ g_{\mathrm{W}} $, the SM coupling. |
png pdf |
Figure 5-b:
Observed (solid line) and expected (dashed line) upper limits at 95% CL on the coupling strength ratio, $ g_{\mathrm{W^{'}}}/g_{\mathrm{W}} $ as a function of the mass of the $ \mathrm{W^{'}} $ boson. They are shown for the electron (left) and muon (right) channels. The one and two standard deviation uncertainty bands for the expected limits are shown. The area above the limit curve is excluded. The dotted line represents the case of the SSM $ \mathrm{W^{'}} $ coupling, $ g_{\mathrm{W^{'}}} $, being equal to $ g_{\mathrm{W}} $, the SM coupling. |
| Tables | |
png pdf |
Table 1:
The 95% CL observed (expected) limits for the product $ \sigma_{\mathrm{W^{'}}} \mathcal{B}(\mathrm{W^{'}} \rightarrow\ell\nu) $ for the production and decay of a SSM $ \mathrm{W^{'}} $ boson, derived from the data collected each year, for the electron and muon channels and their combination. The corresponding Run2 limits as published in [none-none-none] are shown for comparison. |
| Summary |
| A search for new physics based on the high-$ m_\mathrm{T} $ region of single lepton (electron or muon) and missing transverse momentum final states, has been performed using the proton proton collision data collected during 2022 and 2023 at $ \sqrt{s}= $ 13.6 TeV, corresponding to an integrated luminosity of 62 fb$ ^{-1} $. No evidence for new physics is observed. These observations are interpreted as limits on the parameters of $ \mathrm{W^{'}} $ bosons as predicted by the sequential standard model (SSM). The exclusion limits at 95% CL on the $ \mathrm{W^{'}} $ mass are found to be 5.7 and 5.6 TeV for the electron and muon channels, respectively. The 95% CL exclusion limit from the combination of both channels is 5.9 TeV. Variations in the coupling strength of the SSM $ \mathrm{W^{'}} $ bosons are also studied. Models for which the ratio of the coupling strength of the $ \mathrm{W^{'}} $ boson to the SM W boson is at the level of 2 $ \times10^{-2} $ are excluded for $ \mathrm{W^{'}} $ masses up to 0.5 TeV. For higher masses the constraint on the coupling weakens, approaching $ g_{\mathrm{W^{'}}}/g_{\mathrm{W}} = $ 1 at the value of the $ \mathrm{W^{'}} $ mass corresponding to the exclusion limit obtained in the SSM analysis. Model-independent limits are also provided that can be used to constrain parameters of several models through reinterpretations. |
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