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| CMS-PAS-B2G-16-020 | ||
| Search for new resonances decaying to $\mathrm{WW}/\mathrm{WZ} \to \ell\nu \mathrm{qq}$ | ||
| CMS Collaboration | ||
| August 2016 | ||
| Abstract: A search for massive narrow resonances decaying to pairs of W and Z bosons in the $\ell\nu\mathrm{qq}$ final state is presented, based on 12.9 fb$^{-1}$ of pp collision data collected in 2016 by the CMS experiment at the CERN LHC with a center-of-mass energy of 13 TeV. Spin-1 and spin-2 resonances corresponding to masses in the range 600-4500 GeV and decaying to WW/WZ are probed using the $\ell\nu\mathrm{qq}$ final state. Cross section and resonance mass exclusion limits are set for models that predict gravitons and heavy spin-1 bosons. | ||
| Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1-a:
Pruned jet mass and $N$-subjettiness ratio $\tau _{21}$ distributions in the ${m_{\text {jet}}}$ signal region and sideband. The signal distributions are scaled to an arbitrary cross section for better visualisation. The W+jets background from simulation is rescaled such that the total number of background events matches the number of events in data. The grey band represents the statistical uncertainty. a,b: muon channel; c,d: electron channel. |
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Figure 1-b:
Pruned jet mass and $N$-subjettiness ratio $\tau _{21}$ distributions in the ${m_{\text {jet}}}$ signal region and sideband. The signal distributions are scaled to an arbitrary cross section for better visualisation. The W+jets background from simulation is rescaled such that the total number of background events matches the number of events in data. The grey band represents the statistical uncertainty. a,b: muon channel; c,d: electron channel. |
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Figure 1-c:
Pruned jet mass and $N$-subjettiness ratio $\tau _{21}$ distributions in the ${m_{\text {jet}}}$ signal region and sideband. The signal distributions are scaled to an arbitrary cross section for better visualisation. The W+jets background from simulation is rescaled such that the total number of background events matches the number of events in data. The grey band represents the statistical uncertainty. a,b: muon channel; c,d: electron channel. |
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Figure 1-d:
Pruned jet mass and $N$-subjettiness ratio $\tau _{21}$ distributions in the ${m_{\text {jet}}}$ signal region and sideband. The signal distributions are scaled to an arbitrary cross section for better visualisation. The W+jets background from simulation is rescaled such that the total number of background events matches the number of events in data. The grey band represents the statistical uncertainty. a,b: muon channel; c,d: electron channel. |
png pdf |
Figure 2-a:
Distributions of the pruned jet mass ${m_{\text {jet}}}$ in the muon (a,c) and electron (b,d) channels, for low mass (a,b) and high mass (c,d) region. The uncertainty band represents the statistical uncertainty on the background prediction. All selections are applied except the final ${m_{\text {jet}}}$ signal window requirement. Data are shown as black markers. The contribution of the W+jets background is extrapolated from the sideband to the signal region 65-95 GeV, which is represented with a grey shaded area and marked with a label. The grey shaded area between 95-135 GeV is not used in the analysis in order to avoid bias in future searches for WH, ZH and HH resonances. |
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Figure 2-b:
Distributions of the pruned jet mass ${m_{\text {jet}}}$ in the muon (a,c) and electron (b,d) channels, for low mass (a,b) and high mass (c,d) region. The uncertainty band represents the statistical uncertainty on the background prediction. All selections are applied except the final ${m_{\text {jet}}}$ signal window requirement. Data are shown as black markers. The contribution of the W+jets background is extrapolated from the sideband to the signal region 65-95 GeV, which is represented with a grey shaded area and marked with a label. The grey shaded area between 95-135 GeV is not used in the analysis in order to avoid bias in future searches for WH, ZH and HH resonances. |
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Figure 2-c:
Distributions of the pruned jet mass ${m_{\text {jet}}}$ in the muon (a,c) and electron (b,d) channels, for low mass (a,b) and high mass (c,d) region. The uncertainty band represents the statistical uncertainty on the background prediction. All selections are applied except the final ${m_{\text {jet}}}$ signal window requirement. Data are shown as black markers. The contribution of the W+jets background is extrapolated from the sideband to the signal region 65-95 GeV, which is represented with a grey shaded area and marked with a label. The grey shaded area between 95-135 GeV is not used in the analysis in order to avoid bias in future searches for WH, ZH and HH resonances. |
png pdf |
Figure 2-d:
Distributions of the pruned jet mass ${m_{\text {jet}}}$ in the muon (a,c) and electron (b,d) channels, for low mass (a,b) and high mass (c,d) region. The uncertainty band represents the statistical uncertainty on the background prediction. All selections are applied except the final ${m_{\text {jet}}}$ signal window requirement. Data are shown as black markers. The contribution of the W+jets background is extrapolated from the sideband to the signal region 65-95 GeV, which is represented with a grey shaded area and marked with a label. The grey shaded area between 95-135 GeV is not used in the analysis in order to avoid bias in future searches for WH, ZH and HH resonances. |
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Figure 3-a:
Final observed $ {m_{ {\mathrm {W}} {\mathrm {W}} }} $ distributions for the WW analyses in the signal region. (a,c) and (b,d) plots show muon and electron channels. (a,b) and (c,d) plots show low and high mass. The solid curve represents the background estimation provided by the data-driven method as discussed in Sec. 6.1. The hatched band includes both statistical and systematic (of normalization and of shape) uncertainties. The data are shown as black markers. The bottom panels show the corresponding pull distributions, quantifying the agreement between the background-only hypothesis and the data. The pull distribution is defined as the difference between the data and the background prediction, divided by the error on data. The error bars on the points represent the statistical uncertainty of the data, while the uncertainty band (statistics+systematics) on the background prediction is shown with a yellow band. |
png pdf |
Figure 3-b:
Final observed $ {m_{ {\mathrm {W}} {\mathrm {W}} }} $ distributions for the WW analyses in the signal region. (a,c) and (b,d) plots show muon and electron channels. (a,b) and (c,d) plots show low and high mass. The solid curve represents the background estimation provided by the data-driven method as discussed in Sec. 6.1. The hatched band includes both statistical and systematic (of normalization and of shape) uncertainties. The data are shown as black markers. The bottom panels show the corresponding pull distributions, quantifying the agreement between the background-only hypothesis and the data. The pull distribution is defined as the difference between the data and the background prediction, divided by the error on data. The error bars on the points represent the statistical uncertainty of the data, while the uncertainty band (statistics+systematics) on the background prediction is shown with a yellow band. |
png pdf |
Figure 3-c:
Final observed $ {m_{ {\mathrm {W}} {\mathrm {W}} }} $ distributions for the WW analyses in the signal region. (a,c) and (b,d) plots show muon and electron channels. (a,b) and (c,d) plots show low and high mass. The solid curve represents the background estimation provided by the data-driven method as discussed in Sec. 6.1. The hatched band includes both statistical and systematic (of normalization and of shape) uncertainties. The data are shown as black markers. The bottom panels show the corresponding pull distributions, quantifying the agreement between the background-only hypothesis and the data. The pull distribution is defined as the difference between the data and the background prediction, divided by the error on data. The error bars on the points represent the statistical uncertainty of the data, while the uncertainty band (statistics+systematics) on the background prediction is shown with a yellow band. |
png pdf |
Figure 3-d:
Final observed $ {m_{ {\mathrm {W}} {\mathrm {W}} }} $ distributions for the WW analyses in the signal region. (a,c) and (b,d) plots show muon and electron channels. (a,b) and (c,d) plots show low and high mass. The solid curve represents the background estimation provided by the data-driven method as discussed in Sec. 6.1. The hatched band includes both statistical and systematic (of normalization and of shape) uncertainties. The data are shown as black markers. The bottom panels show the corresponding pull distributions, quantifying the agreement between the background-only hypothesis and the data. The pull distribution is defined as the difference between the data and the background prediction, divided by the error on data. The error bars on the points represent the statistical uncertainty of the data, while the uncertainty band (statistics+systematics) on the background prediction is shown with a yellow band. |
png pdf |
Figure 4-a:
Final observed $ {m_{ {\mathrm {W}} {\mathrm {Z}} }} $ distributions for the WZ analyses in the signal region. (a,c) and (b,d) plots show muon and electron channels. (a,b) and (c,d) plots show low and high mass. The solid curve represents the background estimation provided by the data-driven method as discussed in Sec. 6.1. The hatched band includes both statistical and systematic (of normalization and of shape) uncertainties. The data are shown as black markers. The bottom panels show the corresponding pull distributions, quantifying the agreement between the background-only hypothesis and the data. The pull distribution is defined as the difference between the data and the background prediction, divided by the error on data. The error bars on the points represent the statistical uncertainty of the data, while the uncertainty band (statistics+systematics) on the background prediction is shown with a yellow band. |
png pdf |
Figure 4-b:
Final observed $ {m_{ {\mathrm {W}} {\mathrm {Z}} }} $ distributions for the WZ analyses in the signal region. (a,c) and (b,d) plots show muon and electron channels. (a,b) and (c,d) plots show low and high mass. The solid curve represents the background estimation provided by the data-driven method as discussed in Sec. 6.1. The hatched band includes both statistical and systematic (of normalization and of shape) uncertainties. The data are shown as black markers. The bottom panels show the corresponding pull distributions, quantifying the agreement between the background-only hypothesis and the data. The pull distribution is defined as the difference between the data and the background prediction, divided by the error on data. The error bars on the points represent the statistical uncertainty of the data, while the uncertainty band (statistics+systematics) on the background prediction is shown with a yellow band. |
png pdf |
Figure 4-c:
Final observed $ {m_{ {\mathrm {W}} {\mathrm {Z}} }} $ distributions for the WZ analyses in the signal region. (a,c) and (b,d) plots show muon and electron channels. (a,b) and (c,d) plots show low and high mass. The solid curve represents the background estimation provided by the data-driven method as discussed in Sec. 6.1. The hatched band includes both statistical and systematic (of normalization and of shape) uncertainties. The data are shown as black markers. The bottom panels show the corresponding pull distributions, quantifying the agreement between the background-only hypothesis and the data. The pull distribution is defined as the difference between the data and the background prediction, divided by the error on data. The error bars on the points represent the statistical uncertainty of the data, while the uncertainty band (statistics+systematics) on the background prediction is shown with a yellow band. |
png pdf |
Figure 4-d:
Final observed $ {m_{ {\mathrm {W}} {\mathrm {Z}} }} $ distributions for the WZ analyses in the signal region. (a,c) and (b,d) plots show muon and electron channels. (a,b) and (c,d) plots show low and high mass. The solid curve represents the background estimation provided by the data-driven method as discussed in Sec. 6.1. The hatched band includes both statistical and systematic (of normalization and of shape) uncertainties. The data are shown as black markers. The bottom panels show the corresponding pull distributions, quantifying the agreement between the background-only hypothesis and the data. The pull distribution is defined as the difference between the data and the background prediction, divided by the error on data. The error bars on the points represent the statistical uncertainty of the data, while the uncertainty band (statistics+systematics) on the background prediction is shown with a yellow band. |
png pdf |
Figure 5:
$m_{\mathrm {WW}}$ distribution for different signal mass points. The area of each shape is proportional to the total signal efficiency of the corresponding mass point. |
png pdf |
Figure 6-a:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the product of the graviton production cross section and the branching fraction of $ { {\mathrm {G}} _{\mathrm {bulk}}}\to {\mathrm {W}} {\mathrm {W}}$ in the muon (a) and electron (b) channel. The theoretical cross section multiplied by the relevant branching ratio is shown as a red solid line. The dashed vertical line delineates the transition between the low and high mass searches. |
png pdf |
Figure 6-b:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the product of the graviton production cross section and the branching fraction of $ { {\mathrm {G}} _{\mathrm {bulk}}}\to {\mathrm {W}} {\mathrm {W}}$ in the muon (a) and electron (b) channel. The theoretical cross section multiplied by the relevant branching ratio is shown as a red solid line. The dashed vertical line delineates the transition between the low and high mass searches. |
png pdf |
Figure 7:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the product of the graviton production cross section and the branching fraction of $ { {\mathrm {G}} _{\mathrm {bulk}}}\to {\mathrm {W}} {\mathrm {W}}$ for the statistical combination of electron and muon channels. The theoretical cross section multiplied by the relevant branching ratio is shown as a red solid line. The dashed vertical line delineates the transition between the low and high mass searches. |
png pdf |
Figure 8-a:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the product of the W' production cross section and the branching fraction of $\mathrm{ W' } \to {\mathrm {W}} {\mathrm {Z}} $ in the muon (a) and electron (b) channel. The theoretical cross section multiplied by the relevant branching ratio is shown as a red solid line. The dashed vertical line delineates the transition between the low and high mass searches. |
png pdf |
Figure 8-b:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the product of the W' production cross section and the branching fraction of $\mathrm{ W' } \to {\mathrm {W}} {\mathrm {Z}} $ in the muon (a) and electron (b) channel. The theoretical cross section multiplied by the relevant branching ratio is shown as a red solid line. The dashed vertical line delineates the transition between the low and high mass searches. |
png pdf |
Figure 9:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the product of the W' production cross section and the branching fraction of $\mathrm{ W' } \to {\mathrm {W}} {\mathrm {Z}} $ for the statistical combination of electron and muon channels. The theoretical cross section multiplied by the relevant branching ratio is shown as a red solid line. The dashed vertical line delineates the transition between the low and high mass searches. |
| Tables | |
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Table 1:
Summary of the systematic uncertainties and their impact on the signal yield and reconstructed ${m_{ {\mathrm {W}} {\mathrm {V}} }} $ shape (mean and width) for both muon and electron channels. Ranges are denoted in square brackets. |
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Table 2:
Systematic uncertainties affecting the background normalization. Ranges are denoted in square brackets. |
| Summary |
| We have presented a search for new resonances decaying to WW and WZ in which one of the bosons decays hadronically. The final state considered is $\ell \nu {\mathrm{ q q' }} $ with $\ell=\mu$ or e. The results include the case in which $\mathrm{ W } \to \tau\nu$ where $\tau$ decays leptonically. W or Z bosons that decay to quarks are identified by requiring a jet with mass compatible with the W or Z boson mass. Additional information from jet substructure is used to reduce the background from W+jets and multijet processes. No evidence for a signal is found, and upper limits at 95% CL are set for resonance masses between 600 and 4500 GeV on the bulk graviton $\rightarrow \mathrm{ WW } $ and HVT $ \mathrm{ W' } \rightarrow \mathrm{ W }\mathrm{ Z } $ production cross section, in the range of 400 to 4 fb and 1000 to 3 fb, respectively. These cross section limits are the most stringent to date in these final states. |
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