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| CMS-PAS-B2G-19-002 | ||
| Search for heavy resonances decaying to WW, WZ, or WH boson pairs in the lepton plus merged jet final state at $\sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| March 2021 | ||
| Abstract: A search for new heavy resonances decaying to pairs of bosons (WW, WZ, or WH) is presented. The analysis uses data from proton-proton collisions collected by the CMS detector from 2016 to 2018 at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 137 fb$^{-1}$. One of the bosons is required to be a W boson decaying to an electron or muon and a neutrino, while the other boson is required to be reconstructed as a single massive jet with substructure compatible with a quark pair from a W or Z boson decay, or a bottom quark pair from a Higgs boson decay. The search is performed in the resonance mass range between 1.0 and 4.5 TeV, and includes a specific search for resonances produced via vector boson fusion. The signal is extracted using a two-dimensional maximum likelihood fit to the jet mass and the diboson invariant mass distributions. No significant excess is observed above the estimated background. Model-independent upper limits on the production cross section of spin-0, spin-1, or spin-2 heavy resonances are derived as a function of the resonance mass, and are interpreted in the context of bulk radion, heavy vector triplet, and bulk graviton models. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to PRD. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
Feynman diagrams for three of the processes studied in this note: (left) ggF produced spin-2 resonance decaying to ${{\mathrm{W} \mathrm{W}} \,\to \,\ell \nu {\mathrm{q} \mathrm{\bar{q}}} ^{\prime}} $; (center) DY produced charged spin-1 resonance decaying to ${{\mathrm{W} \mathrm{H}} \,\to \,\ell \nu {\mathrm{b} {}\mathrm{\bar{b}}}} $; (right) VBF produced charged spin-1 resonance decaying to ${{\mathrm{W} \mathrm{Z}} \,\to \,\ell \nu {\mathrm{q} \mathrm{\bar{q}}}}$. |
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Figure 1-a:
Feynman diagrams for three of the processes studied in this note: (left) ggF produced spin-2 resonance decaying to ${{\mathrm{W} \mathrm{W}} \,\to \,\ell \nu {\mathrm{q} \mathrm{\bar{q}}} ^{\prime}} $; (center) DY produced charged spin-1 resonance decaying to ${{\mathrm{W} \mathrm{H}} \,\to \,\ell \nu {\mathrm{b} {}\mathrm{\bar{b}}}} $; (right) VBF produced charged spin-1 resonance decaying to ${{\mathrm{W} \mathrm{Z}} \,\to \,\ell \nu {\mathrm{q} \mathrm{\bar{q}}}}$. |
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Figure 1-b:
Feynman diagrams for three of the processes studied in this note: (left) ggF produced spin-2 resonance decaying to ${{\mathrm{W} \mathrm{W}} \,\to \,\ell \nu {\mathrm{q} \mathrm{\bar{q}}} ^{\prime}} $; (center) DY produced charged spin-1 resonance decaying to ${{\mathrm{W} \mathrm{H}} \,\to \,\ell \nu {\mathrm{b} {}\mathrm{\bar{b}}}} $; (right) VBF produced charged spin-1 resonance decaying to ${{\mathrm{W} \mathrm{Z}} \,\to \,\ell \nu {\mathrm{q} \mathrm{\bar{q}}}}$. |
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Figure 1-c:
Feynman diagrams for three of the processes studied in this note: (left) ggF produced spin-2 resonance decaying to ${{\mathrm{W} \mathrm{W}} \,\to \,\ell \nu {\mathrm{q} \mathrm{\bar{q}}} ^{\prime}} $; (center) DY produced charged spin-1 resonance decaying to ${{\mathrm{W} \mathrm{H}} \,\to \,\ell \nu {\mathrm{b} {}\mathrm{\bar{b}}}} $; (right) VBF produced charged spin-1 resonance decaying to ${{\mathrm{W} \mathrm{Z}} \,\to \,\ell \nu {\mathrm{q} \mathrm{\bar{q}}}}$. |
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Figure 2:
Distributions of the soft-drop jet mass ${m_\text {jet}}$ (top left), mass-decorrelated $N$-subjettiness ratio ${\tau _{21}^\text {DDT}}$ (top right), double-b tagger (bottom left), and difference in rapidity ${{| \Delta y |}}$ between the reconstructed bosons, for data and simulated events in the top-enriched control region. No event categorization is applied. The events with $ {\tau _{21}^\text {DDT}} > $ 0.80 are not shown in distributions other than ${\tau _{21}^\text {DDT}}$ itself. The vertical bars correspond to the statistical uncertainties of the data. |
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Figure 2-a:
Distributions of the soft-drop jet mass ${m_\text {jet}}$ (top left), mass-decorrelated $N$-subjettiness ratio ${\tau _{21}^\text {DDT}}$ (top right), double-b tagger (bottom left), and difference in rapidity ${{| \Delta y |}}$ between the reconstructed bosons, for data and simulated events in the top-enriched control region. No event categorization is applied. The events with $ {\tau _{21}^\text {DDT}} > $ 0.80 are not shown in distributions other than ${\tau _{21}^\text {DDT}}$ itself. The vertical bars correspond to the statistical uncertainties of the data. |
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Figure 2-b:
Distributions of the soft-drop jet mass ${m_\text {jet}}$ (top left), mass-decorrelated $N$-subjettiness ratio ${\tau _{21}^\text {DDT}}$ (top right), double-b tagger (bottom left), and difference in rapidity ${{| \Delta y |}}$ between the reconstructed bosons, for data and simulated events in the top-enriched control region. No event categorization is applied. The events with $ {\tau _{21}^\text {DDT}} > $ 0.80 are not shown in distributions other than ${\tau _{21}^\text {DDT}}$ itself. The vertical bars correspond to the statistical uncertainties of the data. |
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Figure 2-c:
Distributions of the soft-drop jet mass ${m_\text {jet}}$ (top left), mass-decorrelated $N$-subjettiness ratio ${\tau _{21}^\text {DDT}}$ (top right), double-b tagger (bottom left), and difference in rapidity ${{| \Delta y |}}$ between the reconstructed bosons, for data and simulated events in the top-enriched control region. No event categorization is applied. The events with $ {\tau _{21}^\text {DDT}} > $ 0.80 are not shown in distributions other than ${\tau _{21}^\text {DDT}}$ itself. The vertical bars correspond to the statistical uncertainties of the data. |
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Figure 2-d:
Distributions of the soft-drop jet mass ${m_\text {jet}}$ (top left), mass-decorrelated $N$-subjettiness ratio ${\tau _{21}^\text {DDT}}$ (top right), double-b tagger (bottom left), and difference in rapidity ${{| \Delta y |}}$ between the reconstructed bosons, for data and simulated events in the top-enriched control region. No event categorization is applied. The events with $ {\tau _{21}^\text {DDT}} > $ 0.80 are not shown in distributions other than ${\tau _{21}^\text {DDT}}$ itself. The vertical bars correspond to the statistical uncertainties of the data. |
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Figure 3:
Comparison between the fit result and data distributions of ${m_\text {jet}}$ in the six muon-LDy categories. The statistical uncertainties of the data are shown as vertical bars. The lower panels show the ratio of the data to the fit result. |
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Figure 3-a:
Comparison between the fit result and data distributions of ${m_\text {jet}}$ in the six muon-LDy categories. The statistical uncertainties of the data are shown as vertical bars. The lower panels show the ratio of the data to the fit result. |
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Figure 3-b:
Comparison between the fit result and data distributions of ${m_\text {jet}}$ in the six muon-LDy categories. The statistical uncertainties of the data are shown as vertical bars. The lower panels show the ratio of the data to the fit result. |
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Figure 3-c:
Comparison between the fit result and data distributions of ${m_\text {jet}}$ in the six muon-LDy categories. The statistical uncertainties of the data are shown as vertical bars. The lower panels show the ratio of the data to the fit result. |
png pdf |
Figure 3-d:
Comparison between the fit result and data distributions of ${m_\text {jet}}$ in the six muon-LDy categories. The statistical uncertainties of the data are shown as vertical bars. The lower panels show the ratio of the data to the fit result. |
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Figure 3-e:
Comparison between the fit result and data distributions of ${m_\text {jet}}$ in the six muon-LDy categories. The statistical uncertainties of the data are shown as vertical bars. The lower panels show the ratio of the data to the fit result. |
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Figure 3-f:
Comparison between the fit result and data distributions of ${m_\text {jet}}$ in the six muon-LDy categories. The statistical uncertainties of the data are shown as vertical bars. The lower panels show the ratio of the data to the fit result. |
png pdf |
Figure 4:
Comparison between the fit result and data distributions of ${m_{{\mathrm{W} \mathrm{V}}}}$ in the six muon-LDy categories. The statistical uncertainties of the data are shown as vertical bars. The lower panels show the ratio of the data to the fit result. |
png pdf |
Figure 4-a:
Comparison between the fit result and data distributions of ${m_{{\mathrm{W} \mathrm{V}}}}$ in the six muon-LDy categories. The statistical uncertainties of the data are shown as vertical bars. The lower panels show the ratio of the data to the fit result. |
png pdf |
Figure 4-b:
Comparison between the fit result and data distributions of ${m_{{\mathrm{W} \mathrm{V}}}}$ in the six muon-LDy categories. The statistical uncertainties of the data are shown as vertical bars. The lower panels show the ratio of the data to the fit result. |
png pdf |
Figure 4-c:
Comparison between the fit result and data distributions of ${m_{{\mathrm{W} \mathrm{V}}}}$ in the six muon-LDy categories. The statistical uncertainties of the data are shown as vertical bars. The lower panels show the ratio of the data to the fit result. |
png pdf |
Figure 4-d:
Comparison between the fit result and data distributions of ${m_{{\mathrm{W} \mathrm{V}}}}$ in the six muon-LDy categories. The statistical uncertainties of the data are shown as vertical bars. The lower panels show the ratio of the data to the fit result. |
png pdf |
Figure 4-e:
Comparison between the fit result and data distributions of ${m_{{\mathrm{W} \mathrm{V}}}}$ in the six muon-LDy categories. The statistical uncertainties of the data are shown as vertical bars. The lower panels show the ratio of the data to the fit result. |
png pdf |
Figure 4-f:
Comparison between the fit result and data distributions of ${m_{{\mathrm{W} \mathrm{V}}}}$ in the six muon-LDy categories. The statistical uncertainties of the data are shown as vertical bars. The lower panels show the ratio of the data to the fit result. |
png pdf |
Figure 5:
Exclusion limits on the product of the production cross section and the branching fraction for a new spin-2 resonance produced via gluon-gluon fusion (left) or vector boson fusion (right) and decaying to WW, as a function of the resonance mass hypothesis, compared with the predicted cross sections for a spin-2 bulk graviton with $ {\tilde{k}} = $ 0.5. Signal cross section uncertainties are shown as red cross-hatched bands. |
png pdf |
Figure 5-a:
Exclusion limits on the product of the production cross section and the branching fraction for a new spin-2 resonance produced via gluon-gluon fusion (left) or vector boson fusion (right) and decaying to WW, as a function of the resonance mass hypothesis, compared with the predicted cross sections for a spin-2 bulk graviton with $ {\tilde{k}} = $ 0.5. Signal cross section uncertainties are shown as red cross-hatched bands. |
png pdf |
Figure 5-b:
Exclusion limits on the product of the production cross section and the branching fraction for a new spin-2 resonance produced via gluon-gluon fusion (left) or vector boson fusion (right) and decaying to WW, as a function of the resonance mass hypothesis, compared with the predicted cross sections for a spin-2 bulk graviton with $ {\tilde{k}} = $ 0.5. Signal cross section uncertainties are shown as red cross-hatched bands. |
png pdf |
Figure 6:
Exclusion limits on the product of the production cross section and the branching fraction for a new spin-0 resonance produced via gluon-gluon fusion (left) or vector boson fusion (right) and decaying to WW, as a function of the resonance mass hypothesis, compared with the predicted cross sections for a spin-0 bulk radion with $\Lambda _{R} = $ 3 TeV and $kl=$ 35. Signal cross section uncertainties are shown as red cross-hatched bands. |
png pdf |
Figure 6-a:
Exclusion limits on the product of the production cross section and the branching fraction for a new spin-0 resonance produced via gluon-gluon fusion (left) or vector boson fusion (right) and decaying to WW, as a function of the resonance mass hypothesis, compared with the predicted cross sections for a spin-0 bulk radion with $\Lambda _{R} = $ 3 TeV and $kl=$ 35. Signal cross section uncertainties are shown as red cross-hatched bands. |
png pdf |
Figure 6-b:
Exclusion limits on the product of the production cross section and the branching fraction for a new spin-0 resonance produced via gluon-gluon fusion (left) or vector boson fusion (right) and decaying to WW, as a function of the resonance mass hypothesis, compared with the predicted cross sections for a spin-0 bulk radion with $\Lambda _{R} = $ 3 TeV and $kl=$ 35. Signal cross section uncertainties are shown as red cross-hatched bands. |
png pdf |
Figure 7:
Exclusion limits on the product of the production cross section and the branching fraction for a new neutral spin-1 resonance produced via Drell-Yan (top left) or vector boson fusion (top right) and decaying to WW, for a new charged spin-1 resonance produced via Drell-Yan (center left) or vector boson fusion (center right) and decaying to WZ, and for a new charged spin-1 resonance produced via Drell-Yan and decaying to WH (bottom), as a function of the resonance mass hypothesis, compared with the predicted cross sections for a W' or Z' from HVT model B (for DY) or HVT model C with $ {c_\text {H}} =$ 3 (for VBF). Signal cross section uncertainties are shown as red cross-hatched bands. |
png pdf |
Figure 7-a:
Exclusion limits on the product of the production cross section and the branching fraction for a new neutral spin-1 resonance produced via Drell-Yan (top left) or vector boson fusion (top right) and decaying to WW, for a new charged spin-1 resonance produced via Drell-Yan (center left) or vector boson fusion (center right) and decaying to WZ, and for a new charged spin-1 resonance produced via Drell-Yan and decaying to WH (bottom), as a function of the resonance mass hypothesis, compared with the predicted cross sections for a W' or Z' from HVT model B (for DY) or HVT model C with $ {c_\text {H}} =$ 3 (for VBF). Signal cross section uncertainties are shown as red cross-hatched bands. |
png pdf |
Figure 7-b:
Exclusion limits on the product of the production cross section and the branching fraction for a new neutral spin-1 resonance produced via Drell-Yan (top left) or vector boson fusion (top right) and decaying to WW, for a new charged spin-1 resonance produced via Drell-Yan (center left) or vector boson fusion (center right) and decaying to WZ, and for a new charged spin-1 resonance produced via Drell-Yan and decaying to WH (bottom), as a function of the resonance mass hypothesis, compared with the predicted cross sections for a W' or Z' from HVT model B (for DY) or HVT model C with $ {c_\text {H}} =$ 3 (for VBF). Signal cross section uncertainties are shown as red cross-hatched bands. |
png pdf |
Figure 7-c:
Exclusion limits on the product of the production cross section and the branching fraction for a new neutral spin-1 resonance produced via Drell-Yan (top left) or vector boson fusion (top right) and decaying to WW, for a new charged spin-1 resonance produced via Drell-Yan (center left) or vector boson fusion (center right) and decaying to WZ, and for a new charged spin-1 resonance produced via Drell-Yan and decaying to WH (bottom), as a function of the resonance mass hypothesis, compared with the predicted cross sections for a W' or Z' from HVT model B (for DY) or HVT model C with $ {c_\text {H}} =$ 3 (for VBF). Signal cross section uncertainties are shown as red cross-hatched bands. |
png pdf |
Figure 7-d:
Exclusion limits on the product of the production cross section and the branching fraction for a new neutral spin-1 resonance produced via Drell-Yan (top left) or vector boson fusion (top right) and decaying to WW, for a new charged spin-1 resonance produced via Drell-Yan (center left) or vector boson fusion (center right) and decaying to WZ, and for a new charged spin-1 resonance produced via Drell-Yan and decaying to WH (bottom), as a function of the resonance mass hypothesis, compared with the predicted cross sections for a W' or Z' from HVT model B (for DY) or HVT model C with $ {c_\text {H}} =$ 3 (for VBF). Signal cross section uncertainties are shown as red cross-hatched bands. |
png pdf |
Figure 7-e:
Exclusion limits on the product of the production cross section and the branching fraction for a new neutral spin-1 resonance produced via Drell-Yan (top left) or vector boson fusion (top right) and decaying to WW, for a new charged spin-1 resonance produced via Drell-Yan (center left) or vector boson fusion (center right) and decaying to WZ, and for a new charged spin-1 resonance produced via Drell-Yan and decaying to WH (bottom), as a function of the resonance mass hypothesis, compared with the predicted cross sections for a W' or Z' from HVT model B (for DY) or HVT model C with $ {c_\text {H}} =$ 3 (for VBF). Signal cross section uncertainties are shown as red cross-hatched bands. |
| Tables | |
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Table 1:
Summary of the systematic uncertainties considered in the 2D fit, the quantities they affect, and their magnitude, when applicable. When ranges are given, the magnitude of the uncertainty depends on the signal model or mass. |
| Summary |
| A search for new heavy resonances with mass larger than 1 TeV and decaying to WW, WZ, or WH boson pairs that decay semi-leptonically is performed using pp collision events containing one high-${p_{\mathrm{T}}}$ muon or electron, large missing transverse momentum, and a massive large-radius jet. The signal extraction strategy is structured around a two-dimensional maximum-likelihood fit to the distributions of the diboson reconstructed mass and the soft-drop jet mass. The sensitivity to different final states and production mechanisms is enhanced by the use of event categories that exploit the mass-decorrelated $N$-subjettiness ratio, the double-b tagger, the presence of a pair of forward jets compatible with vector boson fusion production, and the difference in rapidity between the reconstructed bosons. No significant excess is found, and the results are interpreted in terms of upper limits on the production cross section of new resonances. The excluded cross section values are compared to expectations from theoretical calculations. |
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