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| CMS-PAS-HIG-17-033 | ||
| Search for a heavy Higgs boson decaying to a pair of W bosons in proton-proton collisions at $\sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| March 2019 | ||
| Abstract: A search for a heavy Higgs boson decaying to a pair of W bosons in the mass range from 200 GeV to 3 TeV is presented. The analysis is based on proton-proton collisions recorded by the CMS experiment at the CERN LHC in 2016, corresponding to an integrated luminosity of 35.9 fb$^{-1}$ at $\sqrt{s}= $ 13 TeV. The decay of the W boson pair is reconstructed in the $\ell \nu \ell ' \nu '$ and $\ell \nu \mathrm{q\bar{q}}$ final states. Both gluon fusion and vector boson fusion production of the signal are considered, with a number of hypotheses for their relative contribution investigated. Interference effects between the signal and background are also taken into account. Dedicated event categorizations based on the kinematic properties of associated jets and matrix element techniques are employed to optimise the signal sensitivity. The observed data are consistent with the standard model expectation. Combined upper limits at the 95% confidence level on the product of the cross section and branching fraction exclude a heavy Higgs boson with Standard Model-like couplings and decays in the mass range evaluated. Exclusion limits are also set in the context of two Higgs doublet models. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, JHEP 03 (2020) 034. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
Generator level mass of a ggF produced 700 GeV signal (black line) normalized to the SM cross-section. The effects of the interference of the signal with the gg$\to $WW continuum and the SM Higgs are shown in blue and red respectively. The total interference effect is shown in green. |
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Figure 2:
The $m_T^I$ distributions in data and simulation for events in the different flavour (top and middle) and same flavour (bottom) categories of the 2$\ell $2$\nu $ analysis. The points represent the data and the stacked histograms the expected backgrounds. The open histograms show the sum of the expected ggF and VBF produced signals without considering interference effects and normalized to the SM cross-sections. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
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Figure 2-a:
The $m_T^I$ distributions in data and simulation for events in the different flavour (top and middle) and same flavour (bottom) categories of the 2$\ell $2$\nu $ analysis. The points represent the data and the stacked histograms the expected backgrounds. The open histograms show the sum of the expected ggF and VBF produced signals without considering interference effects and normalized to the SM cross-sections. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
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Figure 2-b:
The $m_T^I$ distributions in data and simulation for events in the different flavour (top and middle) and same flavour (bottom) categories of the 2$\ell $2$\nu $ analysis. The points represent the data and the stacked histograms the expected backgrounds. The open histograms show the sum of the expected ggF and VBF produced signals without considering interference effects and normalized to the SM cross-sections. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
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Figure 2-c:
The $m_T^I$ distributions in data and simulation for events in the different flavour (top and middle) and same flavour (bottom) categories of the 2$\ell $2$\nu $ analysis. The points represent the data and the stacked histograms the expected backgrounds. The open histograms show the sum of the expected ggF and VBF produced signals without considering interference effects and normalized to the SM cross-sections. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
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Figure 2-d:
The $m_T^I$ distributions in data and simulation for events in the different flavour (top and middle) and same flavour (bottom) categories of the 2$\ell $2$\nu $ analysis. The points represent the data and the stacked histograms the expected backgrounds. The open histograms show the sum of the expected ggF and VBF produced signals without considering interference effects and normalized to the SM cross-sections. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
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Figure 2-e:
The $m_T^I$ distributions in data and simulation for events in the different flavour (top and middle) and same flavour (bottom) categories of the 2$\ell $2$\nu $ analysis. The points represent the data and the stacked histograms the expected backgrounds. The open histograms show the sum of the expected ggF and VBF produced signals without considering interference effects and normalized to the SM cross-sections. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
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Figure 2-f:
The $m_T^I$ distributions in data and simulation for events in the different flavour (top and middle) and same flavour (bottom) categories of the 2$\ell $2$\nu $ analysis. The points represent the data and the stacked histograms the expected backgrounds. The open histograms show the sum of the expected ggF and VBF produced signals without considering interference effects and normalized to the SM cross-sections. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
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Figure 3:
The $m_{\mathrm{WW}}$ distributions in data and simulation for events in the boosted (left) and resolved (right) production categories of the $\ell \nu $2$q$ analysis. Electron and muon channels are combined. The points represent the data and the stacked histograms the expected backgrounds. The open histograms show the sum of the expected ggF and VBF produced signals without considering interference effects and normalized to the SM cross-sections. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
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Figure 3-a:
The $m_{\mathrm{WW}}$ distributions in data and simulation for events in the boosted (left) and resolved (right) production categories of the $\ell \nu $2$q$ analysis. Electron and muon channels are combined. The points represent the data and the stacked histograms the expected backgrounds. The open histograms show the sum of the expected ggF and VBF produced signals without considering interference effects and normalized to the SM cross-sections. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
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Figure 3-b:
The $m_{\mathrm{WW}}$ distributions in data and simulation for events in the boosted (left) and resolved (right) production categories of the $\ell \nu $2$q$ analysis. Electron and muon channels are combined. The points represent the data and the stacked histograms the expected backgrounds. The open histograms show the sum of the expected ggF and VBF produced signals without considering interference effects and normalized to the SM cross-sections. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
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Figure 3-c:
The $m_{\mathrm{WW}}$ distributions in data and simulation for events in the boosted (left) and resolved (right) production categories of the $\ell \nu $2$q$ analysis. Electron and muon channels are combined. The points represent the data and the stacked histograms the expected backgrounds. The open histograms show the sum of the expected ggF and VBF produced signals without considering interference effects and normalized to the SM cross-sections. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
png pdf |
Figure 3-d:
The $m_{\mathrm{WW}}$ distributions in data and simulation for events in the boosted (left) and resolved (right) production categories of the $\ell \nu $2$q$ analysis. Electron and muon channels are combined. The points represent the data and the stacked histograms the expected backgrounds. The open histograms show the sum of the expected ggF and VBF produced signals without considering interference effects and normalized to the SM cross-sections. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
png pdf |
Figure 3-e:
The $m_{\mathrm{WW}}$ distributions in data and simulation for events in the boosted (left) and resolved (right) production categories of the $\ell \nu $2$q$ analysis. Electron and muon channels are combined. The points represent the data and the stacked histograms the expected backgrounds. The open histograms show the sum of the expected ggF and VBF produced signals without considering interference effects and normalized to the SM cross-sections. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
png pdf |
Figure 3-f:
The $m_{\mathrm{WW}}$ distributions in data and simulation for events in the boosted (left) and resolved (right) production categories of the $\ell \nu $2$q$ analysis. Electron and muon channels are combined. The points represent the data and the stacked histograms the expected backgrounds. The open histograms show the sum of the expected ggF and VBF produced signals without considering interference effects and normalized to the SM cross-sections. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
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Figure 4:
The $m_T^I$ distributions in data and simulation for events in the top control regions of the 2$\ell $2$\nu $ different flavour categories (top and middle) and the DY control regions of the 2$\ell $2$\nu $ same flavour categories (bottom). The points represent the data and the stacked histograms the expected backgrounds. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
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Figure 4-a:
The $m_T^I$ distributions in data and simulation for events in the top control regions of the 2$\ell $2$\nu $ different flavour categories (top and middle) and the DY control regions of the 2$\ell $2$\nu $ same flavour categories (bottom). The points represent the data and the stacked histograms the expected backgrounds. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
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Figure 4-b:
The $m_T^I$ distributions in data and simulation for events in the top control regions of the 2$\ell $2$\nu $ different flavour categories (top and middle) and the DY control regions of the 2$\ell $2$\nu $ same flavour categories (bottom). The points represent the data and the stacked histograms the expected backgrounds. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
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Figure 4-c:
The $m_T^I$ distributions in data and simulation for events in the top control regions of the 2$\ell $2$\nu $ different flavour categories (top and middle) and the DY control regions of the 2$\ell $2$\nu $ same flavour categories (bottom). The points represent the data and the stacked histograms the expected backgrounds. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
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Figure 4-d:
The $m_T^I$ distributions in data and simulation for events in the top control regions of the 2$\ell $2$\nu $ different flavour categories (top and middle) and the DY control regions of the 2$\ell $2$\nu $ same flavour categories (bottom). The points represent the data and the stacked histograms the expected backgrounds. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
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Figure 4-e:
The $m_T^I$ distributions in data and simulation for events in the top control regions of the 2$\ell $2$\nu $ different flavour categories (top and middle) and the DY control regions of the 2$\ell $2$\nu $ same flavour categories (bottom). The points represent the data and the stacked histograms the expected backgrounds. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
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Figure 4-f:
The $m_T^I$ distributions in data and simulation for events in the top control regions of the 2$\ell $2$\nu $ different flavour categories (top and middle) and the DY control regions of the 2$\ell $2$\nu $ same flavour categories (bottom). The points represent the data and the stacked histograms the expected backgrounds. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
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Figure 5:
The $m_{WW}$ distributions in data and simulation for events in the sideband control regions of the $\ell \nu $2$q$ boosted (left) and resolved (right) production categories. Electron and muon channels are combined. The points represent the data and the stacked histograms the expected backgrounds. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
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Figure 5-a:
The $m_{WW}$ distributions in data and simulation for events in the sideband control regions of the $\ell \nu $2$q$ boosted (left) and resolved (right) production categories. Electron and muon channels are combined. The points represent the data and the stacked histograms the expected backgrounds. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
png pdf |
Figure 5-b:
The $m_{WW}$ distributions in data and simulation for events in the sideband control regions of the $\ell \nu $2$q$ boosted (left) and resolved (right) production categories. Electron and muon channels are combined. The points represent the data and the stacked histograms the expected backgrounds. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
png pdf |
Figure 5-c:
The $m_{WW}$ distributions in data and simulation for events in the sideband control regions of the $\ell \nu $2$q$ boosted (left) and resolved (right) production categories. Electron and muon channels are combined. The points represent the data and the stacked histograms the expected backgrounds. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
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Figure 5-d:
The $m_{WW}$ distributions in data and simulation for events in the sideband control regions of the $\ell \nu $2$q$ boosted (left) and resolved (right) production categories. Electron and muon channels are combined. The points represent the data and the stacked histograms the expected backgrounds. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
png pdf |
Figure 5-e:
The $m_{WW}$ distributions in data and simulation for events in the sideband control regions of the $\ell \nu $2$q$ boosted (left) and resolved (right) production categories. Electron and muon channels are combined. The points represent the data and the stacked histograms the expected backgrounds. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
png pdf |
Figure 5-f:
The $m_{WW}$ distributions in data and simulation for events in the sideband control regions of the $\ell \nu $2$q$ boosted (left) and resolved (right) production categories. Electron and muon channels are combined. The points represent the data and the stacked histograms the expected backgrounds. The shaded area shows the combined statistical and systematic uncertainties on the background estimation. Lower panels show the ratio of data to the expected background. |
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Figure 6:
Expected and observed exclusion limits at 95% CL on the X cross section times branching fraction to WW for a number of $f_{\text{VBF}}$ hypotheses. For the SM $f_{\text{VBF}}$ (top left) and floating $f_{\text{VBF}}$ (top right) cases the red line represents the sum of the SM cross sections for ggF and VBF production, while for the $f_{\text{VBF}}=0$ (bottom left) and the $f_{\text{VBF}}=1$ (bottom right) cases it represents the ggF and VBF production cross sections respectively. The black dotted line corresponds to the central expected value while the yellow and green bands represent the $ \pm 1 \sigma $ and $ \pm 2 \sigma $ uncertainties respectively. |
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Figure 6-a:
Expected and observed exclusion limits at 95% CL on the X cross section times branching fraction to WW for a number of $f_{\text{VBF}}$ hypotheses. For the SM $f_{\text{VBF}}$ (top left) and floating $f_{\text{VBF}}$ (top right) cases the red line represents the sum of the SM cross sections for ggF and VBF production, while for the $f_{\text{VBF}}=0$ (bottom left) and the $f_{\text{VBF}}=1$ (bottom right) cases it represents the ggF and VBF production cross sections respectively. The black dotted line corresponds to the central expected value while the yellow and green bands represent the $ \pm 1 \sigma $ and $ \pm 2 \sigma $ uncertainties respectively. |
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Figure 6-b:
Expected and observed exclusion limits at 95% CL on the X cross section times branching fraction to WW for a number of $f_{\text{VBF}}$ hypotheses. For the SM $f_{\text{VBF}}$ (top left) and floating $f_{\text{VBF}}$ (top right) cases the red line represents the sum of the SM cross sections for ggF and VBF production, while for the $f_{\text{VBF}}=0$ (bottom left) and the $f_{\text{VBF}}=1$ (bottom right) cases it represents the ggF and VBF production cross sections respectively. The black dotted line corresponds to the central expected value while the yellow and green bands represent the $ \pm 1 \sigma $ and $ \pm 2 \sigma $ uncertainties respectively. |
png pdf |
Figure 6-c:
Expected and observed exclusion limits at 95% CL on the X cross section times branching fraction to WW for a number of $f_{\text{VBF}}$ hypotheses. For the SM $f_{\text{VBF}}$ (top left) and floating $f_{\text{VBF}}$ (top right) cases the red line represents the sum of the SM cross sections for ggF and VBF production, while for the $f_{\text{VBF}}=0$ (bottom left) and the $f_{\text{VBF}}=1$ (bottom right) cases it represents the ggF and VBF production cross sections respectively. The black dotted line corresponds to the central expected value while the yellow and green bands represent the $ \pm 1 \sigma $ and $ \pm 2 \sigma $ uncertainties respectively. |
png pdf |
Figure 6-d:
Expected and observed exclusion limits at 95% CL on the X cross section times branching fraction to WW for a number of $f_{\text{VBF}}$ hypotheses. For the SM $f_{\text{VBF}}$ (top left) and floating $f_{\text{VBF}}$ (top right) cases the red line represents the sum of the SM cross sections for ggF and VBF production, while for the $f_{\text{VBF}}=0$ (bottom left) and the $f_{\text{VBF}}=1$ (bottom right) cases it represents the ggF and VBF production cross sections respectively. The black dotted line corresponds to the central expected value while the yellow and green bands represent the $ \pm 1 \sigma $ and $ \pm 2 \sigma $ uncertainties respectively. |
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Figure 7:
Expected and observed 95% CL upper limits on $\tan\beta $ as a function of $m_{\mathrm{H}}$ for a type-1 (left) and type-2 (right) 2HDM. It is assumed that $m_{\mathrm{H}}=m_{\mathrm{A}}$ and $\cos(\beta -\alpha)=0.1$. The expected limit is shown as a dashed black line. The dark and bright gray bands indicate the $ \pm 1 \sigma $ and $ \pm 2 \sigma $ uncertainties on the expected limit. The observed exclusion contour is indicated by the colored blue area. |
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Figure 7-a:
Expected and observed 95% CL upper limits on $\tan\beta $ as a function of $m_{\mathrm{H}}$ for a type-1 (left) and type-2 (right) 2HDM. It is assumed that $m_{\mathrm{H}}=m_{\mathrm{A}}$ and $\cos(\beta -\alpha)=0.1$. The expected limit is shown as a dashed black line. The dark and bright gray bands indicate the $ \pm 1 \sigma $ and $ \pm 2 \sigma $ uncertainties on the expected limit. The observed exclusion contour is indicated by the colored blue area. |
png pdf |
Figure 7-b:
Expected and observed 95% CL upper limits on $\tan\beta $ as a function of $m_{\mathrm{H}}$ for a type-1 (left) and type-2 (right) 2HDM. It is assumed that $m_{\mathrm{H}}=m_{\mathrm{A}}$ and $\cos(\beta -\alpha)=0.1$. The expected limit is shown as a dashed black line. The dark and bright gray bands indicate the $ \pm 1 \sigma $ and $ \pm 2 \sigma $ uncertainties on the expected limit. The observed exclusion contour is indicated by the colored blue area. |
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Figure 8:
Expected and observed 95% CL upper limits on $\tan\beta $ as a function of $m_{\mathrm{A}}$ for the $m_h^{mod+}$ (left) and hMSSM (right) scenarios. The expected limit is shown as a dashed black line. The dark and bright gray bands indicate the $ \pm 1 \sigma $ and $ \pm 2 \sigma $ uncertainties on the expected limit. The observed exclusion contour is indicated by the colored blue area. |
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Figure 8-a:
Expected and observed 95% CL upper limits on $\tan\beta $ as a function of $m_{\mathrm{A}}$ for the $m_h^{mod+}$ (left) and hMSSM (right) scenarios. The expected limit is shown as a dashed black line. The dark and bright gray bands indicate the $ \pm 1 \sigma $ and $ \pm 2 \sigma $ uncertainties on the expected limit. The observed exclusion contour is indicated by the colored blue area. |
png pdf |
Figure 8-b:
Expected and observed 95% CL upper limits on $\tan\beta $ as a function of $m_{\mathrm{A}}$ for the $m_h^{mod+}$ (left) and hMSSM (right) scenarios. The expected limit is shown as a dashed black line. The dark and bright gray bands indicate the $ \pm 1 \sigma $ and $ \pm 2 \sigma $ uncertainties on the expected limit. The observed exclusion contour is indicated by the colored blue area. |
| Tables | |
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Table 1:
Summary of systematic uncertainties, quoted in percent, affecting the normalization of background and signal samples. The numbers shown as ranges represent the uncertainties for different processes and categories. A dash (--) represents uncertainties either estimated to be negligible($ < $0.1%), or not applicable in the specific analysis category. |
| Summary |
| A search for a heavy Higgs boson decaying to a pair of W bosons in the mass range from 200 GeV to 3 TeV has been presented. The data analysed were collected by the CMS experiment at the CERN LHC in 2016, corresponding to an integrated luminosity of 35.9 fb$^{-1}$ at $\sqrt{s}=$ 13 TeV. Two final states of the W boson pair decay, $\ell \nu \ell ' \nu '$ and $\ell \nu \mathrm{q\bar{q}}$, and two signal production mechanisms, gluon fusion and vector boson fusion, are considered. Combined upper limits at the 95% confidence level on the product of the cross section and branching fraction have excluded a heavy Higgs boson with Standard Model-like couplings and decays in the mass range evaluated. Exclusion limits have also been set in the context of two Higgs doublet models. For the $m_h^{mod+}$ and hMSSM scenarios the regions at low values of $m_{\mathrm{A}}$ and $\tan\beta$ have been excluded. |
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