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| CMS-PAS-B2G-23-008 | ||
| Search for a heavy resonance decaying into ZH in events with an energetic jet and two electrons, two muons, or missing transverse momentum | ||
| CMS Collaboration | ||
| 26 March 2024 | ||
| Abstract: A search is presented for a heavy resonance decaying into a Z boson and a Higgs (H) boson. The analysis uses data from proton-proton collisions at a centre-of-mass energy of 13 TeV corresponding to 138 fb$ ^{-1} $ of integrated luminosity, recorded with the CMS experiment in the years 2016 to 2018. Resonance masses between 1.4 and 5 TeV are considered, resulting in large transverse momenta of the Z and H bosons. The search targets the Z boson decay into two electrons, two muons, or two neutrinos. The H boson is reconstructed with a single large-radius jet, recoiling against the Z boson. The search is designed for the hadronic H boson decay modes $ \mathrm{H} \to \mathrm{c}\bar{\mathrm{c}} $ and $ \mathrm{H} \to \mathrm{V}\mathrm{V}^{*} \to $ 4 quarks, where V denotes a W or Z boson. It achieves complementary sensitivity to previous searches targeting the $ \mathrm{H}\to \mathrm{b}\bar{\mathrm{b}} $ decays for high resonance masses. | ||
| Links: CDS record (PDF) ; Physics Briefing ; CADI line (restricted) ; | ||
| Figures | |
png pdf |
Figure 1:
Distributions in $ m_{\mathrm{Z}^{\prime}}^{\text{rec}} $ for the dimuon (upper left), dielectron (upper right), and in $ m_{\mathrm{Z}^{\prime}}^{\mathrm{T}} $ for the neutrino (lower) channels after the kinematic selections. The data are compared to simulation. The ratios to the total SM background are shown in the lower panels, where the statistical and total uncertainties are displayed as grey regions. The signal distributions are shown for an arbitrary cross section of 1 pb. |
png pdf |
Figure 1-a:
Distributions in $ m_{\mathrm{Z}^{\prime}}^{\text{rec}} $ for the dimuon (upper left), dielectron (upper right), and in $ m_{\mathrm{Z}^{\prime}}^{\mathrm{T}} $ for the neutrino (lower) channels after the kinematic selections. The data are compared to simulation. The ratios to the total SM background are shown in the lower panels, where the statistical and total uncertainties are displayed as grey regions. The signal distributions are shown for an arbitrary cross section of 1 pb. |
png pdf |
Figure 1-b:
Distributions in $ m_{\mathrm{Z}^{\prime}}^{\text{rec}} $ for the dimuon (upper left), dielectron (upper right), and in $ m_{\mathrm{Z}^{\prime}}^{\mathrm{T}} $ for the neutrino (lower) channels after the kinematic selections. The data are compared to simulation. The ratios to the total SM background are shown in the lower panels, where the statistical and total uncertainties are displayed as grey regions. The signal distributions are shown for an arbitrary cross section of 1 pb. |
png pdf |
Figure 1-c:
Distributions in $ m_{\mathrm{Z}^{\prime}}^{\text{rec}} $ for the dimuon (upper left), dielectron (upper right), and in $ m_{\mathrm{Z}^{\prime}}^{\mathrm{T}} $ for the neutrino (lower) channels after the kinematic selections. The data are compared to simulation. The ratios to the total SM background are shown in the lower panels, where the statistical and total uncertainties are displayed as grey regions. The signal distributions are shown for an arbitrary cross section of 1 pb. |
png pdf |
Figure 2:
The product of signal acceptance and efficiency for signal events as a function of $ m_{\mathrm{Z}^{\prime}} $ for the charged lepton and neutrino channels in the SR. The efficiency is calculated with respect to Z boson decays to neutrinos and to charged leptons for the neutrino and charged lepton channels, respectively. For comparison, the results from the $ \leq $1b category of the previous CMS search in the ZH channel [16] are shown as dashed lines. |
png pdf |
Figure 3:
Fits of the background functions to the $ m_{\mathrm{Z}^{\prime}} $ and $ m_{\mathrm{Z}^{\prime}}^{\mathrm{T}} $ distributions in data in the VRs (left) and simulation in the SRs (right) for the muon (upper), electron (middle), and neutrino (lower) channels. Each bin is divided by the bin width. The fit range excludes the kinematic turn-on, created by the selection criteria. |
png pdf |
Figure 3-a:
Fits of the background functions to the $ m_{\mathrm{Z}^{\prime}} $ and $ m_{\mathrm{Z}^{\prime}}^{\mathrm{T}} $ distributions in data in the VRs (left) and simulation in the SRs (right) for the muon (upper), electron (middle), and neutrino (lower) channels. Each bin is divided by the bin width. The fit range excludes the kinematic turn-on, created by the selection criteria. |
png pdf |
Figure 3-b:
Fits of the background functions to the $ m_{\mathrm{Z}^{\prime}} $ and $ m_{\mathrm{Z}^{\prime}}^{\mathrm{T}} $ distributions in data in the VRs (left) and simulation in the SRs (right) for the muon (upper), electron (middle), and neutrino (lower) channels. Each bin is divided by the bin width. The fit range excludes the kinematic turn-on, created by the selection criteria. |
png pdf |
Figure 3-c:
Fits of the background functions to the $ m_{\mathrm{Z}^{\prime}} $ and $ m_{\mathrm{Z}^{\prime}}^{\mathrm{T}} $ distributions in data in the VRs (left) and simulation in the SRs (right) for the muon (upper), electron (middle), and neutrino (lower) channels. Each bin is divided by the bin width. The fit range excludes the kinematic turn-on, created by the selection criteria. |
png pdf |
Figure 3-d:
Fits of the background functions to the $ m_{\mathrm{Z}^{\prime}} $ and $ m_{\mathrm{Z}^{\prime}}^{\mathrm{T}} $ distributions in data in the VRs (left) and simulation in the SRs (right) for the muon (upper), electron (middle), and neutrino (lower) channels. Each bin is divided by the bin width. The fit range excludes the kinematic turn-on, created by the selection criteria. |
png pdf |
Figure 3-e:
Fits of the background functions to the $ m_{\mathrm{Z}^{\prime}} $ and $ m_{\mathrm{Z}^{\prime}}^{\mathrm{T}} $ distributions in data in the VRs (left) and simulation in the SRs (right) for the muon (upper), electron (middle), and neutrino (lower) channels. Each bin is divided by the bin width. The fit range excludes the kinematic turn-on, created by the selection criteria. |
png pdf |
Figure 3-f:
Fits of the background functions to the $ m_{\mathrm{Z}^{\prime}} $ and $ m_{\mathrm{Z}^{\prime}}^{\mathrm{T}} $ distributions in data in the VRs (left) and simulation in the SRs (right) for the muon (upper), electron (middle), and neutrino (lower) channels. Each bin is divided by the bin width. The fit range excludes the kinematic turn-on, created by the selection criteria. |
png pdf |
Figure 4:
Distributions in $ m_{\mathrm{Z}^{\prime}}^{\text{rec}} $ and $ m_{\mathrm{Z}^{\prime}}^{\mathrm{T}} $ for data in the SRs, together with fits of the background functions under the background-only hypothesis for the muon (upper left), electron (upper right), and neutrino (lower) channels. The number of observed events in each bin is divided by the bin width. The signal predictions are shown for different $ \mathrm{Z}^{\prime} $ masses. |
png pdf |
Figure 4-a:
Distributions in $ m_{\mathrm{Z}^{\prime}}^{\text{rec}} $ and $ m_{\mathrm{Z}^{\prime}}^{\mathrm{T}} $ for data in the SRs, together with fits of the background functions under the background-only hypothesis for the muon (upper left), electron (upper right), and neutrino (lower) channels. The number of observed events in each bin is divided by the bin width. The signal predictions are shown for different $ \mathrm{Z}^{\prime} $ masses. |
png pdf |
Figure 4-b:
Distributions in $ m_{\mathrm{Z}^{\prime}}^{\text{rec}} $ and $ m_{\mathrm{Z}^{\prime}}^{\mathrm{T}} $ for data in the SRs, together with fits of the background functions under the background-only hypothesis for the muon (upper left), electron (upper right), and neutrino (lower) channels. The number of observed events in each bin is divided by the bin width. The signal predictions are shown for different $ \mathrm{Z}^{\prime} $ masses. |
png pdf |
Figure 4-c:
Distributions in $ m_{\mathrm{Z}^{\prime}}^{\text{rec}} $ and $ m_{\mathrm{Z}^{\prime}}^{\mathrm{T}} $ for data in the SRs, together with fits of the background functions under the background-only hypothesis for the muon (upper left), electron (upper right), and neutrino (lower) channels. The number of observed events in each bin is divided by the bin width. The signal predictions are shown for different $ \mathrm{Z}^{\prime} $ masses. |
png pdf |
Figure 5:
Expected and observed upper limits at 95% CL on the product of the production cross section $ \sigma\left(\mathrm{p}\mathrm{p} \to \mathrm{Z}^{\prime}\right) $ and the branching fraction $ \mathcal{B}\left(\mathrm{Z}^{\prime} \to \mathrm{Z}\mathrm{H}\right) $ as a function of the $ \mathrm{Z}^{\prime} $ mass. Expected limits obtained from the three different final states are compared to the combined result (left). The expected and observed limits from the combination of all final states are compared to predictions from the HVT and limits from a previous analysis [16] (right). |
png pdf |
Figure 5-a:
Expected and observed upper limits at 95% CL on the product of the production cross section $ \sigma\left(\mathrm{p}\mathrm{p} \to \mathrm{Z}^{\prime}\right) $ and the branching fraction $ \mathcal{B}\left(\mathrm{Z}^{\prime} \to \mathrm{Z}\mathrm{H}\right) $ as a function of the $ \mathrm{Z}^{\prime} $ mass. Expected limits obtained from the three different final states are compared to the combined result (left). The expected and observed limits from the combination of all final states are compared to predictions from the HVT and limits from a previous analysis [16] (right). |
png pdf |
Figure 5-b:
Expected and observed upper limits at 95% CL on the product of the production cross section $ \sigma\left(\mathrm{p}\mathrm{p} \to \mathrm{Z}^{\prime}\right) $ and the branching fraction $ \mathcal{B}\left(\mathrm{Z}^{\prime} \to \mathrm{Z}\mathrm{H}\right) $ as a function of the $ \mathrm{Z}^{\prime} $ mass. Expected limits obtained from the three different final states are compared to the combined result (left). The expected and observed limits from the combination of all final states are compared to predictions from the HVT and limits from a previous analysis [16] (right). |
png pdf |
Figure 6:
Observed upper limits at 95% CL on $ g_{\mathrm{F}} $ for different $ \mathrm{Z}^{\prime} $ masses as a function of the product of $ g_{\mathrm{H}} $ with the sign of $ g_{\mathrm{F}} $. The two benckmark scenarios of the HVT model are shown by the black markers. |
| Tables | |
png pdf |
Table 1:
Sources of systematic uncertainties considered in this analysis, and their effect on the signal normalisation. The uncertainty ranges correspond to different signal masses. |
| Summary |
| A search has been presented for the resonant production of a spin-1 particle with mass in the range of 1.4-5 TeV and the decay into a Z and a Higgs (H) boson. The analysis is performed using data recorded with the CMS detector at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. The final states explored include the Z boson decays into a pair of electrons, muons or neutrinos, and the hadronic decays of the H boson reconstructed as a single large-radius jet. A novel approach analysing the flavour content and substructure of the H boson jet was deployed to improve the sensitivity for high resonance masses. This analysis shows for the first time the benefit of including H boson decays into $ \mathrm{c} \overline{\mathrm{c}} $ and $ \mathrm{V}\mathrm{V}^{*}\to\text{4 quarks} $, where V denotes a W or Z boson, besides the commonly used $ \mathrm{H}\to\mathrm{b}\overline{\mathrm{b}} $ decays in searches for new physics. Exclusion limits at 95% confidence level are set on both the mass of a heavy resonance and the couplings to fermions and bosons in the HVT model. Resonances with masses below 3 TeV are excluded. |
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