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| CMS-PAS-B2G-17-001 | ||
| Search for massive resonances decaying into WW, WZ, ZZ, qW and qZ in the dijet final state at $\sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| March 2017 | ||
| Abstract: A search for new massive resonances decaying to pairs of W and Z bosons or to a W/Z boson and a quark in the dijet final state is presented. Results are based on data corresponding to an integrated luminosity of 35.9 fb$^{-1}$ recorded in proton-proton collisions at $\sqrt{s} = $ 13 TeV with the CMS detector at the CERN LHC in 2016. Resonances with masses of at least 1.2 TeV and decaying to WW, WZ, ZZ, qW, or qZ are probed. Cross section and resonance mass exclusion limits are set for various models that predict gravitons, heavy spin-1 bosons and excited quarks. In a heavy vector triplet model ("B"), W' and Z' resonances with masses below 3.6 and 2.7 TeV, respectively, are excluded at a confidence level of 95%. Similarly, excited quark resonances, q*, decaying to qW and qZ with masses less than 5.0 and 4.8 TeV, respectively, are excluded. In the narrow-width bulk graviton model, cross section upper limits in the range 37.1-0.6 fb are set. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, PRD 97 (2018) 072006. The superseded preliminary plots can be found here. |
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| Figures & Tables | Summary | Additional Figures | References | CMS Publications |
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| Figures | |
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Figure 1:
PUPPI softdrop jet mass distribution in MC and data (left) after preselections and a $\tau _{21}$ cut of 0.35 are applied as well as the PUPPI N-subjettiness $\tau _{21}$ distribution for data and simulated samples (right) after preselections and a softdrop mass cut of 65 $ \leq {m_{\text {jet}}}\leq $ 105 GeV are applied. The ${m_\mathrm {jj}}$ cut has been raised to 1080 GeV from the analysis threshold of 1050 GeV, since no requirement on the substructure is made for the softdrop mass plot and only $ {H_{\mathrm {T}}} $-based triggers and no jet substructure-based triggers can be used. |
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Figure 1-a:
PUPPI softdrop jet mass distribution in MC and data after preselections and a $\tau _{21}$ cut of 0.35 are applied. The ${m_\mathrm {jj}}$ cut has been raised to 1080 GeV from the analysis threshold of 1050 GeV, since no requirement on the substructure is made for the softdrop mass plot and only $ {H_{\mathrm {T}}} $-based triggers and no jet substructure-based triggers can be used. |
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Figure 1-b:
PUPPI N-subjettiness $\tau _{21}$ distribution for data and simulated samples after preselections and a softdrop mass cut of 65 $ \leq {m_{\text {jet}}}\leq $ 105 GeV are applied. The ${m_\mathrm {jj}}$ cut has been raised to 1080 GeV from the analysis threshold of 1050 GeV, since no requirement on the substructure is made for the softdrop mass plot and only $ {H_{\mathrm {T}}} $-based triggers and no jet substructure-based triggers can be used. |
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Figure 2:
Final ${m_\mathrm {jj}}$ distributions for the dijet analysis in the signal regions using 35.9 fb$^{-1}$ of 13 TeV data. On the left, the HP, and on the right, the LP categories are shown for the WW, WZ, and ZZ categories from top to bottom. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers. |
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Figure 2-a:
Final ${m_\mathrm {jj}}$ distributions for the dijet analysis in the signal regions using 35.9 fb$^{-1}$ of 13 TeV data. The HP category is shown for the WW category. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers. |
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Figure 2-b:
Final ${m_\mathrm {jj}}$ distributions for the dijet analysis in the signal regions using 35.9 fb$^{-1}$ of 13 TeV data. The LP category is shown for the WW category. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers. |
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Figure 2-c:
Final ${m_\mathrm {jj}}$ distributions for the dijet analysis in the signal regions using 35.9 fb$^{-1}$ of 13 TeV data. The HP category is shown for the WZ category. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers. |
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Figure 2-d:
Final ${m_\mathrm {jj}}$ distributions for the dijet analysis in the signal regions using 35.9 fb$^{-1}$ of 13 TeV data. The LP category is shown for the WZ category. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers. |
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Figure 2-e:
Final ${m_\mathrm {jj}}$ distributions for the dijet analysis in the signal regions using 35.9 fb$^{-1}$ of 13 TeV data. The HP category is shown for the ZZ category. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers. |
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Figure 2-f:
Final ${m_\mathrm {jj}}$ distributions for the dijet analysis in the signal regions using 35.9 fb$^{-1}$ of 13 TeV data. The LP category is shown for the ZZ category. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers. |
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Figure 3:
Final ${m_\mathrm {jj}}$ distributions for the dijet analysis in the signal regions using 35.9 fb$^{-1}$ of 13 TeV data. On the left, the HP, and on the right, the LP categories are shown for the qW and qZ categories from top to bottom. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers. |
png pdf |
Figure 3-a:
Final ${m_\mathrm {jj}}$ distributions for the dijet analysis in the signal regions using 35.9 fb$^{-1}$ of 13 TeV data. The HP category is shown for the qW category. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers. |
png pdf |
Figure 3-b:
Final ${m_\mathrm {jj}}$ distributions for the dijet analysis in the signal regions using 35.9 fb$^{-1}$ of 13 TeV data. The LP category is shown for the qW category. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers. |
png pdf |
Figure 3-c:
Final ${m_\mathrm {jj}}$ distributions for the dijet analysis in the signal regions using 35.9 fb$^{-1}$ of 13 TeV data. The HP category is shown for the qZ category. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers. |
png pdf |
Figure 3-d:
Final ${m_\mathrm {jj}}$ distributions for the dijet analysis in the signal regions using 35.9 fb$^{-1}$ of 13 TeV data. The LP category is shown for the qZ category. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers. |
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Figure 4:
Dijet invariant mass distribution for different signal mass hypotheses of the q* model decaying to qZ (left) and the bulk graviton model decaying to a pair of Z bosons (right) used to extract the signal shape. |
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Figure 4-a:
Dijet invariant mass distribution for different signal mass hypotheses of the q* model decaying to qZ. |
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Figure 4-b:
The bulk graviton model decaying to a pair of Z bosons used to extract the signal shape. |
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Figure 5:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the production of a narrow-width resonance decaying to a pair of vector bosons for different signal hypotheses. Limits are set in the context of a spin-1 neutral Z' (left) and charged W' (right) resonances, and compared with the prediction of the HVT modelB. On the bottom, limits are set in the context of a bulk graviton decaying into WW (left) and ZZ (right) with $ {\tilde{k}}= $ 0.5 and compared with the model prediction. Signal cross section uncertainties are displayed as a red checked band. |
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Figure 5-a:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the production of a narrow-width resonance decaying to a pair of vector bosons in the context of a spin-1 neutral Z' resonance, and compared with the prediction of the HVT modelB. Signal cross section uncertainties are displayed as a red checked band. |
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Figure 5-b:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the production of a narrow-width resonance decaying to a pair of vector bosons in the context of a spin-1 charged W' resonance, and compared with the prediction of the HVT modelB. Signal cross section uncertainties are displayed as a red checked band. |
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Figure 5-c:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the production of a narrow-width resonance decaying to a pair of vector bosons in the context of a bulk graviton decaying into WW with $ {\tilde{k}}= $ 0.5 and compared with the model prediction. Signal cross section uncertainties are displayed as a red checked band. |
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Figure 5-d:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the production of a narrow-width resonance decaying to a pair of vector bosons in the context of a bulk graviton decaying into ZZ with $ {\tilde{k}}= $ 0.5 and compared with the model prediction. Signal cross section uncertainties are displayed as a red checked band. |
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Figure 6:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the production of an excited quark resonance decaying into qW (left) or qZ (right). Signal cross section uncertainties are displayed as a red checked band. |
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Figure 6-a:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the production of an excited quark resonance decaying into qW. Signal cross section uncertainties are displayed as a red checked band. |
png pdf |
Figure 6-b:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the production of an excited quark resonance decaying into qZ. Signal cross section uncertainties are displayed as a red checked band. |
| Tables | |
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Table 1:
Data-to-simulation scale factors for the efficiency of the ${\tau _{21}}$ selection used in this analysis, as extracted from a top-quark enriched data sample and from simulation. |
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Table 2:
Summary of the signal systematic uncertainties for the analysis and their impact on the event yield in the signal region and on the reconstructed ${m_{ {\mathrm {V}} {\mathrm {V}} }} $ shape (mean and width). The jet-mass and V-tagging uncertainties result in migrations between event categories. The effects of the PDF and scale uncertainties on the signal cross section are not included as nuisance parameters in the limit setting procedure, but are attached to the theory predictions. |
| Summary |
| We have presented a search for new resonances decaying to WW, ZZ, WZ, qW or qZ in which the bosons decay hadronically. W and Z bosons that decay to quarks are identified by requiring a jet with mass compatible with the W or Z boson mass, respectively. Additional information from jet substructure is used to reduce the background from QCD multijet processes. No evidence for a signal is found, and the result is interpreted as an upper limit on the production cross section as a function of the resonance mass in the context of the bulk graviton, and HVT model "B" W' and Z' models as well as in the context of excited quark resonances $\rm{q^*}$. For the HVT model B, we exclude W' and Z' resonances with masses below 3.6 TeV and 2.7 TeV, respectively. In the narrow-width bulk graviton model, cross sections are excluded in the range 37.1-0.6 fb. Exclusion limits are set at a confidence level of 95% on the production of excited quark resonances $\rm{q^*}$ decaying to qW and qZ for masses less than 5.0 TeV and TeV, respectively. This search sets the most stringent mass limits on a $\rm{q^*}$ resonance in the qW and qZ decay mode, as well as a W' or Z' resonance in the diboson decay mode. |
| Additional Figures | |
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Additional Figure 1:
Event display for a VV candidate in the ZZ high-purity category. |
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Additional Figure 2:
Event display for a VV candidate in the ZZ high-purity category. |
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Additional Figure 3:
Event display for a VV candidate in the ZZ high-purity category. |
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Additional Figure 4:
Event display for a jet from the high-purity Z category. |
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Additional Figure 5:
Event display for a VV candidate in the ZZ high-purity category. |
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Additional Figure 6:
Event display for a VV candidate in the WW high-purity category. |
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Additional Figure 7:
Event display for a VV candidate in the WW high-purity category. |
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Additional Figure 8:
Event display for a jet from the high-purity W category. |
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Additional Figure 9:
Event display for a qV candidate in the qW high-purity category. |
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Additional Figure 10:
Event display for a qV candidate in the qW high-purity category. |
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Additional Figure 11:
Event display for a qV candidate in the qW high-purity category. |
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