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| CMS-SMP-18-008 ; CERN-EP-2019-137 | ||
| Search for anomalous triple gauge couplings in WW and WZ production in lepton + jet events in proton-proton collisions at $\sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| 19 July 2019 | ||
| JHEP 12 (2019) 062 | ||
| Abstract: A search is presented for three additional operators that would lead to anomalous WW$ \gamma $ or WWZ couplings with respect to those in the standard model. They are constrained by studying events with two vector bosons; a W boson decaying to e$ \nu $ or $ \mu \nu $, and a W or Z boson decaying hadronically, reconstructed as a single, massive, large-radius jet. The search uses a data set of proton-proton collisions at a centre-of-mass energy of 13 TeV, recorded by the CMS experiment at the CERN LHC in 2016, and corresponding to an integrated luminosity of 35.9 fb$^{-1}$. Using the reconstructed diboson invariant mass, 95% confidence intervals are obtained for the anomalous coupling parameters of $-1.58 < {c_{\mathrm{WWW}}}/\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 of zero for each parameter. These are the strictest bounds on these parameters to date. | ||
| Links: e-print arXiv:1907.08354 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
The LO Feynman diagram for the diboson process involving triple gauge couplings studied in this analysis. One W boson decays to a lepton and a neutrino, and the other W/Z boson decays to a quark-antiquark pair. |
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Figure 2:
Comparison between data and simulation for the ${m_{\text {SD}}}$ (upper) and ${m_{\mathrm{W} {\text {V}}}}$ (lower) distributions in the ${\mathrm{t} {}\mathrm{\bar{t}}}$ control region. Contributions from simulation are normalized to the total integrated luminosity of the data using their respective SM cross sections. 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 ${m_{\text {SD}}}$ distribution in the ${\mathrm{t} {}\mathrm{\bar{t}}}$ control region, in the electron channel.Contributions from simulation are normalized to the total integrated luminosity of the data using their respective SM cross sections. 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 ${m_{\text {SD}}}$ distribution in the ${\mathrm{t} {}\mathrm{\bar{t}}}$ control region, in the muon channel. Contributions from simulation are normalized to the total integrated luminosity of the data using their respective SM cross sections. 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, in the electron channel. Contributions from simulation are normalized to the total integrated luminosity of the data using their respective SM cross sections. 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, in the muon channel. Contributions from simulation are normalized to the total integrated luminosity of the data using their respective SM cross sections. 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 (left) and muon (right) channels, showing the ${m_{\text {SD}}}$ distribution. |
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Figure 3-a:
Final result of the two-dimensional fit in the electron channel, showing the ${m_{\text {SD}}}$ distribution. |
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Figure 3-b:
Final result of the two-dimensional fit in the muon channel, showing the ${m_{\text {SD}}}$ distribution. |
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Figure 4:
Final result of the two-dimensional fit in the electron (left) and muon (right) channels, showing the ${m_{\mathrm{W} {\text {V}}}}$ distributions. The lower sideband, signal, and upper sideband regions are shown on the top, middle, and bottom, respectively. An example of the excluded signal ($ {c_{\mathrm{W} \mathrm{W} \mathrm{W}}} /\Lambda ^2 = 1.59 $ TeV$^{-2}$) is represented by the dashed line. |
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Figure 4-a:
Final result of the two-dimensional fit in the electron channel, showing the ${m_{\mathrm{W} {\text {V}}}}$ distributions. The lower sideband region is shown. An example of the excluded signal ($ {c_{\mathrm{W} \mathrm{W} \mathrm{W}}} /\Lambda ^2 = 1.59 $ TeV$^{-2}$) is represented by the dashed line. |
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Figure 4-b:
Final result of the two-dimensional fit in the muon channel, showing the ${m_{\mathrm{W} {\text {V}}}}$ distributions. The lower sideband region is shown. An example of the excluded signal ($ {c_{\mathrm{W} \mathrm{W} \mathrm{W}}} /\Lambda ^2 = 1.59 $ TeV$^{-2}$) is represented by the dashed line. |
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Figure 4-c:
Final result of the two-dimensional fit in the electron channel, showing the ${m_{\mathrm{W} {\text {V}}}}$ distributions. The signal region is shown. An example of the excluded signal ($ {c_{\mathrm{W} \mathrm{W} \mathrm{W}}} /\Lambda ^2 = 1.59 $ TeV$^{-2}$) is represented by the dashed line. |
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Figure 4-d:
Final result of the two-dimensional fit in the muon channel, showing the ${m_{\mathrm{W} {\text {V}}}}$ distributions. The signal region is shown. An example of the excluded signal ($ {c_{\mathrm{W} \mathrm{W} \mathrm{W}}} /\Lambda ^2 = 1.59 $ TeV$^{-2}$) is represented by the dashed line. |
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Figure 4-e:
Final result of the two-dimensional fit in the electron channel, showing the ${m_{\mathrm{W} {\text {V}}}}$ distributions. The lupper sideband region is shown. An example of the excluded signal ($ {c_{\mathrm{W} \mathrm{W} \mathrm{W}}} /\Lambda ^2 = 1.59 $ TeV$^{-2}$) is represented by the dashed line. |
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Figure 4-f:
Final result of the two-dimensional fit in the muon channel, showing the ${m_{\mathrm{W} {\text {V}}}}$ distributions. The upper sideband region is shown. An example of the excluded signal ($ {c_{\mathrm{W} \mathrm{W} \mathrm{W}}} /\Lambda ^2 = 1.59 $ TeV$^{-2}$) is represented by the dashed line. |
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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$ (centre), 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 and 99% CL contours shown in dotted blue and dot-dashed red, respectively. Contours for the observed 95% CL are shown in solid black. The black square markers represent the SM expectation, while the black crosses show the observed best-fit points. |
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Figure 5-a:
Two-dimensional limits on the aTGC parameters in the EFT parametrization, for the combination $ {c_{\mathrm{W} \mathrm{W} \mathrm{W}}} /\Lambda ^2$-$ {c_{\mathrm{W}}} /\Lambda ^2$. Contours for the expected 95% CL are shown in dashed green, with the 68 and 99% CL contours shown in dotted blue and dot-dashed red, respectively. Contours for the observed 95% CL are shown in solid black. The black square markers represent the SM expectation, while the black crosses show the observed best-fit points. |
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Figure 5-b:
Two-dimensional limits on the aTGC parameters in the EFT parametrization, for the combination $ {c_{\mathrm{W} \mathrm{W} \mathrm{W}}} /\Lambda ^2$-$ {c_{\mathrm{B}}} /\Lambda ^2$. Contours for the expected 95% CL are shown in dashed green, with the 68 and 99% CL contours shown in dotted blue and dot-dashed red, respectively. Contours for the observed 95% CL are shown in solid black. The black square markers represent the SM expectation, while the black crosses show the observed best-fit points. |
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Figure 5-c:
Two-dimensional limits on the aTGC parameters in the EFT parametrization, for the combination $ {c_{\mathrm{W}}} /\Lambda ^2$-$ {c_{\mathrm{B}}} /\Lambda ^2$. Contours for the expected 95% CL are shown in dashed green, with the 68 and 99% CL contours shown in dotted blue and dot-dashed red, respectively. Contours for the observed 95% CL are shown in solid black. The black square markers represent the SM expectation, while the black crosses show the observed best-fit points. |
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Figure 6:
Two-dimensional limits on the aTGC parameters in the LEP parametrization, for the combinations $ {\lambda _{\mathrm{Z}}} $-$ {\Delta g_{1}^{\mathrm{Z}}} $ (left), $ {\lambda _{\mathrm{Z}}} $-$ {\Delta \kappa _{\mathrm{Z}}} $ (centre), 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 and 99% CL contours shown in dotted blue and dot-dashed red, respectively. Contours for the observed 95% CL are shown in solid black. The black square markers represent the SM expectation, while the black crosses show the observed best-fit points. |
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Figure 6-a:
Two-dimensional limits on the aTGC parameters in the LEP parametrization, for the combinations $ {\lambda _{\mathrm{Z}}} $-$ {\Delta g_{1}^{\mathrm{Z}}} $. Contours for the expected 95% CL are shown in dashed green, with the 68 and 99% CL contours shown in dotted blue and dot-dashed red, respectively. Contours for the observed 95% CL are shown in solid black. The black square markers represent the SM expectation, while the black crosses show the observed best-fit points. |
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Figure 6-b:
Two-dimensional limits on the aTGC parameters in the LEP parametrization, for the combinations $ {\lambda _{\mathrm{Z}}} $-$ {\Delta \kappa _{\mathrm{Z}}} $. Contours for the expected 95% CL are shown in dashed green, with the 68 and 99% CL contours shown in dotted blue and dot-dashed red, respectively. Contours for the observed 95% CL are shown in solid black. The black square markers represent the SM expectation, while the black crosses show the observed best-fit points. |
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Figure 6-c:
Two-dimensional limits on the aTGC parameters in the LEP parametrization, for the combinations $ {\Delta g_{1}^{\mathrm{Z}}} $-$ {\Delta \kappa _{\mathrm{Z}}} $. Contours for the expected 95% CL are shown in dashed green, with the 68 and 99% CL contours shown in dotted blue and dot-dashed red, respectively. Contours for the observed 95% CL are shown in solid black. The black square markers represent the SM expectation, while the black crosses show the observed best-fit points. |
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Figure 7:
Comparison of the observed limits on aTGC parameters in the LEP parametrization 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 SM background contributions derived from simulation. |
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Table 3:
Summary of background, signal, and data yields in the WW and WZ categories for each lepton channel. Uncertainties in the background contributions are described in Section 7. The diboson signal predictions with anomalous couplings include both standard model and anomalous contributions, as well as the relevant interference terms. |
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Table 4:
Expected and observed limits at 95% CL on single anomalous couplings, along with observed best-fit values, for both the EFT and LEP parametrizations. For each coupling, all other couplings are explicitly set to zero. Observed limits from collision data taken at a centre-of-mass energy of 8 TeV [26] 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. It uses events where two vector bosons are produced, with one decaying leptonically and the other hadronically to a single, massive, large-radius 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 (scaled by an overall new physics energy scale $\Lambda$) in the effective field theory parametrization, and the ${\lambda_{\mathrm{Z}}} $, $\Delta g_{\mathrm{Z}}$, and $\Delta \kappa_{\mathrm{Z}}$ parameters in the LEP parametrization. For each parametrization, limits are set at 95% confidence level on individual parameters, as well as on pairwise combinations of parameters. Limits on individual parameters in the effective field theory parametrization are determined to be $-1.58 < {c_{\mathrm{WWW}}}/\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 of zero for each parameter. These are the strictest bounds on these parameters to date. |
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