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| CMS-PAS-B2G-16-021 | ||
| Search for massive resonances decaying into WW, WZ, ZZ, qW and qZ in the dijet final state at $\sqrt{s} = $ 13 TeV using 2016 data | ||
| CMS Collaboration | ||
| December 2016 | ||
| 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 12.9 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 1.1 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 2.7 and 2.6 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 3.9 TeV, respectively, are excluded. In the narrow-width bulk graviton model, cross section upper limits in the range 2-80 fb are set. | ||
| Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Final $ {m_\mathrm {jj}} $ distributions for the dijet analysis in the signal regions using 12.9 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 1-a:
Final $ {m_\mathrm {jj}} $ distribution for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data, for the HP, 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 1-b:
Final $ {m_\mathrm {jj}} $ distribution for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data, for the LP, 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 1-c:
Final $ {m_\mathrm {jj}} $ distribution for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data, for the HP, 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 1-d:
Final $ {m_\mathrm {jj}} $ distribution for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data, for the LP, 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 1-e:
Final $ {m_\mathrm {jj}} $ distribution for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data, for the HP, 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. |
png pdf |
Figure 1-f:
Final $ {m_\mathrm {jj}} $ distribution for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data, for the LP, 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. |
png pdf |
Figure 2:
Final $ {m_\mathrm {jj}} $ distributions for the dijet analysis in the signal regions using 12.9 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 2-a:
Final $ {m_\mathrm {jj}} $ distribution for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data, for the HP, 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 2-b:
Final $ {m_\mathrm {jj}} $ distribution for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data, for the LP, 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 2-c:
Final $ {m_\mathrm {jj}} $ distribution for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data, for the HP, 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 2-d:
Final $ {m_\mathrm {jj}} $ distribution for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data, for the LP, 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:
Dijet invariant mass distribution for different signal mass hypotheses used to extract the signal shape. |
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Figure 4:
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 model B. 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 4-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 model B. Signal cross section uncertainties are displayed as a red checked band. |
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Figure 4-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 model B. Signal cross section uncertainties are displayed as a red checked band. |
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Figure 4-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. |
png pdf |
Figure 4-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 5:
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. |
png pdf |
Figure 5-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 5-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:
W jet mass peak position and resolution, as extracted from a top enriched data sample and from simulation. These are used to derive corrections of the soft drop jet mass. |
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Table 3:
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 last three uncertainties result in migrations between event categories, but do not affect the overall signal efficiency. |
| 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 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 an excited quark resonances q*. For the HVT model B, we exclude W' and Z' resonances with masses below 2.7 and 2.6 TeV, respectively. In the narrow-width bulk graviton model, cross sections are excluded in the range 2-80 fb. Exclusion limits are set at a confidence level of 95% on the production of excited quark resonances q* decaying to qW and qZ for masses less than 5.0 and 3.9 TeV, respectively. This search sets the most stringent mass limits on a q* resonance in the qW and qZ decay mode and a Z' resonance in the WW decay mode. It also provides the most stringent cross section limits on narrow-width graviton resonances with masses above 1.1 TeV in the WW and ZZ decay mode. |
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