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| CMS-PAS-SMP-18-008 | ||
| Search for anomalous couplings in semileptonic WW and WZ decays at $\sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| April 2019 | ||
| Abstract: In this search additional operators that would lead to anomalous WW$\gamma$ or WWZ couplings are constrained by studying events with one W boson decaying to $\mathrm{e}\nu$ or $\mu\nu$, and one W or Z boson decaying hadronically, reconstructed as a single massive large-radius jet. The search uses a data set of proton-proton collisions with a centre-of-mass energy of 13 TeV as recorded by the CMS experiment at the CERN LHC in the year 2016, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. Using the reconstructed diboson invariant mass, 95% confidence intervals are derived for the anomalous coupling parameters of $-1.58 < c_{\mathrm{W}\mathrm{W}\mathrm{W}}/\Lambda ^2 < 1.59 $ TeV$^{-2}$, $-2.00 < c_{\mathrm{W}}/\Lambda^2 < 2.65 $ TeV$^{-2}$, and $-8.78 < c_{\mathrm{B}}/\Lambda^2 < 8.54 $ TeV$^{-2}$, in agreement with standard model expectations. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, JHEP 12 (2019) 062. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
The LO Feynman diagram for the diboson process studied in this analysis. One W boson decays to a lepton and a neutrino, and whilst the other WZ boson decays to a quark-antiquark pair. |
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Figure 2:
Comparison between data and simulation for the ${m_{\text {PUPPI SD}}}$ (upper) and ${m_{\mathrm{W} {\text {V}}}}$ (lower) distributions in the ${\mathrm{t} {}\mathrm{\bar{t}}}$ control region. The electron channel is shown on the left, while the muon channel is shown on the right. The lower panel in each figure shows the relative difference between data and simulation. The light grey hashed region in the main panels and dark grey band in the lower ratio panels represent the combined statistical and systematic uncertainties, with details of the latter discussed in Section 7. |
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Figure 2-a:
Comparison between data and simulation for the ${m_{\text {PUPPI SD}}}$ distribution in the ${\mathrm{t} {}\mathrm{\bar{t}}}$ control region and in the electron channel. The lower panel shows the relative difference between data and simulation. The light grey hashed region in the main panel and dark grey band in the lower ratio panel represent the combined statistical and systematic uncertainties, with details of the latter discussed in Section 7. |
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Figure 2-b:
Comparison between data and simulation for the ${m_{\text {PUPPI SD}}}$ distribution in the ${\mathrm{t} {}\mathrm{\bar{t}}}$ control region and in the muon channel. The lower panel shows the relative difference between data and simulation. The light grey hashed region in the main panel and dark grey band in the lower ratio panel represent the combined statistical and systematic uncertainties, with details of the latter discussed in Section 7. |
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Figure 2-c:
Comparison between data and simulation for the ${m_{\mathrm{W} {\text {V}}}}$ distribution in the ${\mathrm{t} {}\mathrm{\bar{t}}}$ control region and in the electron channel. The lower panel shows the relative difference between data and simulation. The light grey hashed region in the main panel and dark grey band in the lower ratio panel represent the combined statistical and systematic uncertainties, with details of the latter discussed in Section 7. |
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Figure 2-d:
Comparison between data and simulation for the ${m_{\mathrm{W} {\text {V}}}}$ distribution in the ${\mathrm{t} {}\mathrm{\bar{t}}}$ control region and in the muon channel. The lower panel shows the relative difference between data and simulation. The light grey hashed region in the main panel and dark grey band in the lower ratio panel represent the combined statistical and systematic uncertainties, with details of the latter discussed in Section 7. |
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Figure 3:
Final result of the two-dimensional fit in the electron channel, showing the ${m_{\mathrm{W} {\text {V}}}}$ (upper) and ${m_{\text {PUPPI SD}}}$ (lower) distributions. The lower sideband, signal, and upper sideband regions are shown on the left, middle, and right, respectively. |
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Figure 3-a:
Final result of the two-dimensional fit in the electron channel, showing the ${m_{\mathrm{W} {\text {V}}}}$ distribution in the lower sideband region. |
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Figure 3-b:
Final result of the two-dimensional fit in the electron channel, showing the ${m_{\mathrm{W} {\text {V}}}}$ distribution in the signal region. |
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Figure 3-c:
Final result of the two-dimensional fit in the electron channel, showing the ${m_{\mathrm{W} {\text {V}}}}$ distribution in the upper sideband region. |
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Figure 3-d:
Final result of the two-dimensional fit in the electron channel, showing the ${m_{\text {PUPPI SD}}}$ distribution. |
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Figure 4:
Final result of the two-dimensional fit in the muon channel, showing the ${m_{\mathrm{W} {\text {V}}}}$ (upper) and ${m_{\text {PUPPI SD}}}$ (lower) distributions. The lower sideband, signal, and upper sideband regions are shown on the left, middle, and right, respectively. |
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Figure 4-a:
Final result of the two-dimensional fit in the muon channel, showing the ${m_{\mathrm{W} {\text {V}}}}$ distribution in the lower sideband region. |
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Figure 4-b:
Final result of the two-dimensional fit in the muon channel, showing the ${m_{\mathrm{W} {\text {V}}}}$ distribution in the signal region. |
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Figure 4-c:
Final result of the two-dimensional fit in the muon channel, showing the ${m_{\mathrm{W} {\text {V}}}}$ distribution in the upper sideband region. |
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Figure 4-d:
Final result of the two-dimensional fit in the muon channel, showing the ${m_{\text {PUPPI SD}}}$ distribution. |
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Figure 5:
Two-dimensional limits on the aTGC parameters in the EFT parametrization, for the combinations $ {c_{\mathrm{W} \mathrm{W} \mathrm{W}}} /\Lambda ^2$-$ {c_{\mathrm{W}}} /\Lambda ^2$ (left), $ {c_{\mathrm{W} \mathrm{W} \mathrm{W}}} /\Lambda ^2$-$ {c_{\mathrm{B}}} /\Lambda ^2$ (center), and $ {c_{\mathrm{W}}} /\Lambda ^2$-$ {c_{\mathrm{B}}} /\Lambda ^2$ (right). Contours for the expected 95% CL are shown in dashed green, with the 68% CL and 99% CL contours shown in dashed blue and red, respectively. Contours for the observed 95% CL are shown in solid black. The black square markers represents the SM expectation, while the black crosses represents the observed best fit points. |
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Figure 5-a:
Two-dimensional limits for the combination $ {c_{\mathrm{W} \mathrm{W} \mathrm{W}}} /\Lambda ^2$-$ {c_{\mathrm{W}}} /\Lambda ^2$ of aTGC parameters in the EFT parametrization. Contours for the expected 95% CL are shown in dashed green, with the 68% CL and 99% CL contours shown in dashed blue and red, respectively. Contours for the observed 95% CL are shown in solid black. The black square markers represents the SM expectation, while the black crosses represents the observed best fit points. |
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Figure 5-b:
Two-dimensional limits for the combination $ {c_{\mathrm{W} \mathrm{W} \mathrm{W}}} /\Lambda ^2$-$ {c_{\mathrm{B}}} /\Lambda ^2$ of aTGC parameters in the EFT parametrization. Contours for the expected 95% CL are shown in dashed green, with the 68% CL and 99% CL contours shown in dashed blue and red, respectively. Contours for the observed 95% CL are shown in solid black. The black square markers represents the SM expectation, while the black crosses represents the observed best fit points. |
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Figure 5-c:
Two-dimensional limits for the combination $ {c_{\mathrm{W}}} /\Lambda ^2$-$ {c_{\mathrm{B}}} /\Lambda ^2$ of aTGC parameters in the EFT parametrization. Contours for the expected 95% CL are shown in dashed green, with the 68% CL and 99% CL contours shown in dashed blue and red, respectively. Contours for the observed 95% CL are shown in solid black. The black square markers represents the SM expectation, while the black crosses represents the observed best fit points. |
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Figure 6:
Two-dimensional limits on the aTGC parameters in the LEP parametrisation, for the combinations $ {\lambda _{\mathrm{Z}}} $-$ {\Delta g_{1}^{\mathrm{Z}}} $ (left), $ {\lambda _{\mathrm{Z}}} $-$ {\Delta \kappa _{\mathrm{Z}}} $ (center), and $ {\Delta g_{1}^{\mathrm{Z}}} $-$ {\Delta \kappa _{\mathrm{Z}}} $ (right). Contours for the expected 95% CL are shown in dashed green, with the 68% CL and 99% CL contours shown in dashed blue and red, respectively. Contours for the observed 95% CL are shown in solid black. The black square markers represents the SM expectation, while the black crosses represents the observed best fit points. |
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Figure 6-a:
Two-dimensional limits for the combination $ {\lambda _{\mathrm{Z}}} $-$ {\Delta g_{1}^{\mathrm{Z}}} $ of aTGC parameters in the LEP parametrisation. Contours for the expected 95% CL are shown in dashed green, with the 68% CL and 99% CL contours shown in dashed blue and red, respectively. Contours for the observed 95% CL are shown in solid black. The black square markers represents the SM expectation, while the black crosses represents the observed best fit points. |
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Figure 6-b:
Two-dimensional limits for the combination $ {\lambda _{\mathrm{Z}}} $-$ {\Delta \kappa _{\mathrm{Z}}} $ of aTGC parameters in the LEP parametrisation. Contours for the expected 95% CL are shown in dashed green, with the 68% CL and 99% CL contours shown in dashed blue and red, respectively. Contours for the observed 95% CL are shown in solid black. The black square markers represents the SM expectation, while the black crosses represents the observed best fit points. |
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Figure 6-c:
Two-dimensional limits for the combination $ {\Delta g_{1}^{\mathrm{Z}}} $-$ {\Delta \kappa _{\mathrm{Z}}} $ of aTGC parameters in the LEP parametrisation. Contours for the expected 95% CL are shown in dashed green, with the 68% CL and 99% CL contours shown in dashed blue and red, respectively. Contours for the observed 95% CL are shown in solid black. The black square markers represents the SM expectation, while the black crosses represents the observed best fit points. |
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Figure 7:
Comparison of the observed limits on the aTGC parameters from different measurements. The highlighted rows represent the limits obtained from this measurement. |
| Tables | |
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Table 1:
Results of the signal extraction fits. The uncertainties in the pre-fit yields are their respective pre-fit constraints, whilst the uncertainties in the post-fit yields are the corresponding total post-fit uncertainties. Since the normalization of the W+jets contribution is allowed to vary freely in the fit, it does not have any corresponding pre-fit uncertainties. |
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Table 2:
Estimated normalization uncertainties (%) for MC-derived SM background contributions. The labels JES, JER, LepEn, LepRes, and LepID represent jet energy scale, jet energy resolution, lepton energy scale, lepton energy resolution, and lepton ID, respectively. |
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Table 3:
Summary of background and signal yields in the WW and WZ categories for each lepton channel. Uncertainties for the ${\mathrm{t} {}\mathrm{\bar{t}}}$, single top quark, and diboson contributions are evaluated as described in Section 7, while the uncertainty in the W+jets contribution is derived from the statistical uncertainty of the ${m_{\text {PUPPI SD}}}$ fit and the fit with the alternative function. |
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Table 4:
Expected and observed limits at 95% CL on single anomalous couplings for both the EFT and LEP parametrizations. For each coupling, all other couplings are explicitly set to 0. Run I limits [21] are also quoted for comparison. |
| Summary |
| A measurement of limits on anomalous triple gauge coupling parameters in terms of dimension-six effective field theory operators has been presented using events where two vector bosons are produced, with one decaying leptonically and the other hadronically to a single large-radius massive jet. Results are based on data recorded in proton-proton collisions at $\sqrt{s} = $ 13 TeV with the CMS detector at the CERN LHC in 2016, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. Limits are presented both in terms of the ${c_{\mathrm{WWW}}}$, ${c_{\mathrm{W}}} $, and ${c_{\mathrm{B}}} $ parameters in the effective field theory parametrization, and the ${\lambda_{\mathrm{Z}}} $, $\Delta g_{1}^{\mathrm{Z}}$, and $\Delta \kappa_{\mathrm{Z}}$ parameters in the LEP parametrization. For each parametrization, limits are set on individual parameters, as well as on pairwise combinations of parameters. They are the strictest bounds from direct measurements so far. |
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Compact Muon Solenoid LHC, CERN |
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