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Compact Muon Solenoid
LHC, CERN

CMS-HIG-14-018 ; CERN-PH-EP-2014-265
Constraints on the spin-parity and anomalous HVV couplings of the Higgs boson in proton collisions at 7 and 8 TeV
Phys. Rev. D 92 (2015) 012004
Abstract: The study of the spin-parity and tensor structure of the interactions of the recently discovered Higgs boson is performed using the H ZZ, Zγ, γγ 4, H WW νν, and H γγ decay modes. The full dataset recorded by the CMS experiment during the LHC Run 1 is used, corresponding to an integrated luminosity of up to 5.1 fb1 at a center-of-mass energy of 7 TeV and up to 19.7 fb1 at 8 TeV. A wide range of spin-two models is excluded at a 99% confidence level or higher, or at a 99.87% confidence level for the minimal gravity-like couplings, regardless of whether assumptions are made on the production mechanism. Any mixed-parity spin-one state is excluded in the ZZ and WW modes at a greater than 99.999% confidence level. Under the hypothesis that the resonance is a spin-zero boson, the tensor structure of the interactions of the Higgs boson with two vector bosons ZZ, Zγ, γγ, and WW is investigated and limits on eleven anomalous contributions are set. Tighter constraints on anomalous HVV interactions are obtained by combining the HZZ and HWW measurements. All observations are consistent with the expectations for the standard model Higgs boson with the quantum numbers JPC = 0++.
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Figures

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Figure 1:
Illustration of the production of a system X in a parton collision and its decay to two vector bosons gg or q¯qXZZ, WW, Zγ, and γγ either with or without sequential decay of each vector boson to a fermion-antifermion pair. The two production angles θ and Φ1 are shown in the X rest frame and the three decay angles θ1, θ2, and Φ are shown in the V rest frames. Here X stands either for a Higgs boson, an exotic particle, or, in general, the genuine or misidentified VV system, including background.

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Figure 2-a:
Distributions of the eight kinematic observables used in the HVV4 analysis: m4, m1, m2, cosθ, cosθ1, cosθ2, Φ, and Φ1. The observed data (points with error bars), the expectations for the SM background (shaded areas), the SM Higgs boson signal (open areas under the solid histogram), and the alternative spin-zero resonances (open areas under the dashed histograms) are shown, as indicated in the legend. The mass of the resonance is taken to be 125.6 GeV and the SM cross section is used. All distributions, with the exception of m4, are presented with the requirement 121.5 <m4< 130.5 GeV .

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Figure 2-b:
Distributions of the eight kinematic observables used in the HVV4 analysis: m4, m1, m2, cosθ, cosθ1, cosθ2, Φ, and Φ1. The observed data (points with error bars), the expectations for the SM background (shaded areas), the SM Higgs boson signal (open areas under the solid histogram), and the alternative spin-zero resonances (open areas under the dashed histograms) are shown, as indicated in the legend. The mass of the resonance is taken to be 125.6 GeV and the SM cross section is used. All distributions, with the exception of m4, are presented with the requirement 121.5 <m4< 130.5 GeV .

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Figure 2-c:
Distributions of the eight kinematic observables used in the HVV4 analysis: m4, m1, m2, cosθ, cosθ1, cosθ2, Φ, and Φ1. The observed data (points with error bars), the expectations for the SM background (shaded areas), the SM Higgs boson signal (open areas under the solid histogram), and the alternative spin-zero resonances (open areas under the dashed histograms) are shown, as indicated in the legend. The mass of the resonance is taken to be 125.6 GeV and the SM cross section is used. All distributions, with the exception of m4, are presented with the requirement 121.5 <m4< 130.5 GeV .

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Figure 2-d:
Distributions of the eight kinematic observables used in the HVV4 analysis: m4, m1, m2, cosθ, cosθ1, cosθ2, Φ, and Φ1. The observed data (points with error bars), the expectations for the SM background (shaded areas), the SM Higgs boson signal (open areas under the solid histogram), and the alternative spin-zero resonances (open areas under the dashed histograms) are shown, as indicated in the legend. The mass of the resonance is taken to be 125.6 GeV and the SM cross section is used. All distributions, with the exception of m4, are presented with the requirement 121.5 <m4< 130.5 GeV .

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Figure 2-e:
Distributions of the eight kinematic observables used in the HVV4 analysis: m4, m1, m2, cosθ, cosθ1, cosθ2, Φ, and Φ1. The observed data (points with error bars), the expectations for the SM background (shaded areas), the SM Higgs boson signal (open areas under the solid histogram), and the alternative spin-zero resonances (open areas under the dashed histograms) are shown, as indicated in the legend. The mass of the resonance is taken to be 125.6 GeV and the SM cross section is used. All distributions, with the exception of m4, are presented with the requirement 121.5 <m4< 130.5 GeV .

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Figure 2-f:
Distributions of the eight kinematic observables used in the HVV4 analysis: m4, m1, m2, cosθ, cosθ1, cosθ2, Φ, and Φ1. The observed data (points with error bars), the expectations for the SM background (shaded areas), the SM Higgs boson signal (open areas under the solid histogram), and the alternative spin-zero resonances (open areas under the dashed histograms) are shown, as indicated in the legend. The mass of the resonance is taken to be 125.6 GeV and the SM cross section is used. All distributions, with the exception of m4, are presented with the requirement 121.5 <m4< 130.5 GeV .

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Figure 2-g:
Distributions of the eight kinematic observables used in the HVV4 analysis: m4, m1, m2, cosθ, cosθ1, cosθ2, Φ, and Φ1. The observed data (points with error bars), the expectations for the SM background (shaded areas), the SM Higgs boson signal (open areas under the solid histogram), and the alternative spin-zero resonances (open areas under the dashed histograms) are shown, as indicated in the legend. The mass of the resonance is taken to be 125.6 GeV and the SM cross section is used. All distributions, with the exception of m4, are presented with the requirement 121.5 <m4< 130.5 GeV .

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Figure 2-h:
Distributions of the eight kinematic observables used in the HVV4 analysis: m4, m1, m2, cosθ, cosθ1, cosθ2, Φ, and Φ1. The observed data (points with error bars), the expectations for the SM background (shaded areas), the SM Higgs boson signal (open areas under the solid histogram), and the alternative spin-zero resonances (open areas under the dashed histograms) are shown, as indicated in the legend. The mass of the resonance is taken to be 125.6 GeV and the SM cross section is used. All distributions, with the exception of m4, are presented with the requirement 121.5 <m4< 130.5 GeV .

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Figure 3-a:
Distributions of m (a, c) and mT (b, d) for events with 0 jets (a, b) and 1 jet (c, d) in the HWWνν analysis. The observed data (points with error bars), the expectations for the SM background (shaded areas), the SM Higgs boson signal (open areas under the solid histogram), and the alternative spin-zero resonance (open areas under the dashed histograms) are shown, as indicated in the legend. The mass of the resonance is taken to be 125.6 GeV and the SM cross section is used.

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Figure 3-b:
Distributions of m (a, c) and mT (b, d) for events with 0 jets (a, b) and 1 jet (c, d) in the HWWνν analysis. The observed data (points with error bars), the expectations for the SM background (shaded areas), the SM Higgs boson signal (open areas under the solid histogram), and the alternative spin-zero resonance (open areas under the dashed histograms) are shown, as indicated in the legend. The mass of the resonance is taken to be 125.6 GeV and the SM cross section is used.

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Figure 3-c:
Distributions of m (a, c) and mT (b, d) for events with 0 jets (a, b) and 1 jet (c, d) in the HWWνν analysis. The observed data (points with error bars), the expectations for the SM background (shaded areas), the SM Higgs boson signal (open areas under the solid histogram), and the alternative spin-zero resonance (open areas under the dashed histograms) are shown, as indicated in the legend. The mass of the resonance is taken to be 125.6 GeV and the SM cross section is used.

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Figure 3-d:
Distributions of m (a, c) and mT (b, d) for events with 0 jets (a, b) and 1 jet (c, d) in the HWWνν analysis. The observed data (points with error bars), the expectations for the SM background (shaded areas), the SM Higgs boson signal (open areas under the solid histogram), and the alternative spin-zero resonance (open areas under the dashed histograms) are shown, as indicated in the legend. The mass of the resonance is taken to be 125.6 GeV and the SM cross section is used.

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Figure 4-a:
Distributions of the kinematic discriminants for the observed data (points with error bars), the expectations for the SM background (shaded areas), the SM Higgs boson signal (open areas under the solid histogram), and the alternative spin-zero resonances (open areas under the dashed histograms) are shown, as indicated in the legend. The mass of the resonance is taken to be 125.6 GeV and the SM cross section is used. a, b, c: Dbkg, D0, DCP; d, e, f: D0h+, Dint, DΛ1. All distributions, with the exception of Dbkg, are shown with the requirement Dbkg> 0.5 to enhance signal purity.

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Figure 4-b:
Distributions of the kinematic discriminants for the observed data (points with error bars), the expectations for the SM background (shaded areas), the SM Higgs boson signal (open areas under the solid histogram), and the alternative spin-zero resonances (open areas under the dashed histograms) are shown, as indicated in the legend. The mass of the resonance is taken to be 125.6 GeV and the SM cross section is used. a, b, c: Dbkg, D0, DCP; d, e, f: D0h+, Dint, DΛ1. All distributions, with the exception of Dbkg, are shown with the requirement Dbkg> 0.5 to enhance signal purity.

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Figure 4-c:
Distributions of the kinematic discriminants for the observed data (points with error bars), the expectations for the SM background (shaded areas), the SM Higgs boson signal (open areas under the solid histogram), and the alternative spin-zero resonances (open areas under the dashed histograms) are shown, as indicated in the legend. The mass of the resonance is taken to be 125.6 GeV and the SM cross section is used. a, b, c: Dbkg, D0, DCP; d, e, f: D0h+, Dint, DΛ1. All distributions, with the exception of Dbkg, are shown with the requirement Dbkg> 0.5 to enhance signal purity.

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Figure 4-d:
Distributions of the kinematic discriminants for the observed data (points with error bars), the expectations for the SM background (shaded areas), the SM Higgs boson signal (open areas under the solid histogram), and the alternative spin-zero resonances (open areas under the dashed histograms) are shown, as indicated in the legend. The mass of the resonance is taken to be 125.6 GeV and the SM cross section is used. a, b, c: Dbkg, D0, DCP; d, e, f: D0h+, Dint, DΛ1. All distributions, with the exception of Dbkg, are shown with the requirement Dbkg> 0.5 to enhance signal purity.

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Figure 4-e:
Distributions of the kinematic discriminants for the observed data (points with error bars), the expectations for the SM background (shaded areas), the SM Higgs boson signal (open areas under the solid histogram), and the alternative spin-zero resonances (open areas under the dashed histograms) are shown, as indicated in the legend. The mass of the resonance is taken to be 125.6 GeV and the SM cross section is used. a, b, c: Dbkg, D0, DCP; d, e, f: D0h+, Dint, DΛ1. All distributions, with the exception of Dbkg, are shown with the requirement Dbkg> 0.5 to enhance signal purity.

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Figure 4-f:
Distributions of the kinematic discriminants for the observed data (points with error bars), the expectations for the SM background (shaded areas), the SM Higgs boson signal (open areas under the solid histogram), and the alternative spin-zero resonances (open areas under the dashed histograms) are shown, as indicated in the legend. The mass of the resonance is taken to be 125.6 GeV and the SM cross section is used. a, b, c: Dbkg, D0, DCP; d, e, f: D0h+, Dint, DΛ1. All distributions, with the exception of Dbkg, are shown with the requirement Dbkg> 0.5 to enhance signal purity.

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Figure 5-a:
(a) Distributions of the test statistic q=2ln(LJP/L0+) for the JP=1+ hypothesis of q¯qX(1+)ZZ tested against the SM Higgs boson hypothesis (0+). The expectation for the SM Higgs boson is represented by the yellow histogram on the right and the alternative JP hypothesis by the blue histogram on the left. The red arrow indicates the observed q value. (b) Observed value of 2ΔlnL as a function of f(JP) and the expectation in the SM for the q¯qX(1+)ZZ alternative JP model.

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Figure 5-b:
(a) Distributions of the test statistic q=2ln(LJP/L0+) for the JP=1+ hypothesis of q¯qX(1+)ZZ tested against the SM Higgs boson hypothesis (0+). The expectation for the SM Higgs boson is represented by the yellow histogram on the right and the alternative JP hypothesis by the blue histogram on the left. The red arrow indicates the observed q value. (b) Observed value of 2ΔlnL as a function of f(JP) and the expectation in the SM for the q¯qX(1+)ZZ alternative JP model.

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Figure 6-a:
Distributions of the test statistic q=2ln(LJP/L0+) as a function of fb2 for the spin-one JP models tested against the SM Higgs boson hypothesis in the q¯qXZZ (a) and decay-only XZZ (b) analyses. The median expectation for the SM Higgs boson is represented by the red squares with the green (68% CL) and yellow (95% CL) solid color regions and for the alternative JP hypotheses by the blue triangles with the red (68% CL) and blue (95% CL) hatched regions. The observed values are indicated by the black dots.

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Figure 6-b:
Distributions of the test statistic q=2ln(LJP/L0+) as a function of fb2 for the spin-one JP models tested against the SM Higgs boson hypothesis in the q¯qXZZ (a) and decay-only XZZ (b) analyses. The median expectation for the SM Higgs boson is represented by the red squares with the green (68% CL) and yellow (95% CL) solid color regions and for the alternative JP hypotheses by the blue triangles with the red (68% CL) and blue (95% CL) hatched regions. The observed values are indicated by the black dots.

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Figure 7:
Summary of the f(JP) constraints as a function of fb2 from Table 6, where the decay-only measurements are performed using the efficiency of the q¯qXZZ selection. The expected 68% and 95% CL regions are shown as green and yellow bands. The observed constraints at 68% and 95% CL are shown as the points with error bars and the excluded hatched regions.

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Figure 8-a:
(a) Distributions of the test statistic q=2ln(LJP/L0+) for the JP=2+h2 hypothesis of ggX(2+h2)ZZ tested against the SM Higgs boson hypothesis (0+). The expectation for the SM Higgs boson is represented by the yellow histogram on the right and the alternative JP hypothesis by the blue histogram on the left. The red arrow indicates the observed q value. (b) Observed value of 2ΔlnL as a function of f(JP) and the expectation in the SM for the ggX(2+h2)ZZ alternative JP model.

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Figure 8-b:
(a) Distributions of the test statistic q=2ln(LJP/L0+) for the JP=2+h2 hypothesis of ggX(2+h2)ZZ tested against the SM Higgs boson hypothesis (0+). The expectation for the SM Higgs boson is represented by the yellow histogram on the right and the alternative JP hypothesis by the blue histogram on the left. The red arrow indicates the observed q value. (b) Observed value of 2ΔlnL as a function of f(JP) and the expectation in the SM for the ggX(2+h2)ZZ alternative JP model.

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Figure 9:
Distributions of the test statistic q=2ln(LJP/L0+) for the spin-two JP models tested against the SM Higgs boson hypothesis in the XZZ analyses. The expected median and the 68.3%, 95.4%, and 99.7% CL regions for the SM Higgs boson (orange, the left for each model) and for the alternative JP hypotheses (blue, right) are shown. The observed q values are indicated by the black dots.

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Figure 10:
Summary of the f(JP) constraints for the spin-two models from Table 7, where the decay-only measurements are performed using the efficiency of the ggXZZ selection. The expected 68% and 95% CL regions are shown as the green and yellow bands. The observed constraints at 68% and 95% CL are shown as the points with error bars and the excluded hatched regions.

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Figure 11-a:
(a) Distributions of the test statistic q=2ln(LJP/L0+) for the JP=1+ hypothesis of q¯qX(1+)WW against the SM Higgs boson hypothesis (0+). The expectation for the SM Higgs boson is represented by the yellow histogram on the right and the alternative JP hypothesis by the blue histogram on the left. The red arrow indicates the observed q value. (b) Observed value of 2ΔlnL as a function of f(JP) and the expectation in the SM for the q¯qX(1+)WW alternative JP model.

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Figure 11-b:
(a) Distributions of the test statistic q=2ln(LJP/L0+) for the JP=1+ hypothesis of q¯qX(1+)WW against the SM Higgs boson hypothesis (0+). The expectation for the SM Higgs boson is represented by the yellow histogram on the right and the alternative JP hypothesis by the blue histogram on the left. The red arrow indicates the observed q value. (b) Observed value of 2ΔlnL as a function of f(JP) and the expectation in the SM for the q¯qX(1+)WW alternative JP model.

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Figure 12-a:
(a) Distributions of the test statistic q=2ln(LJP/L0+) for the JP=2+h2 hypothesis of ggX(2+h2)WW against the SM Higgs boson hypothesis (0+). The expectation for the SM Higgs boson is represented by the yellow histogram on the right and the alternative JP hypothesis by the blue histogram on the left. The red arrow indicates the observed q value. (b) Observed value of 2ΔlnL as a function of f(JP) and the expectation in the SM for the ggX(2+h2)WW alternative JP model.

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Figure 12-b:
(a) Distributions of the test statistic q=2ln(LJP/L0+) for the JP=2+h2 hypothesis of ggX(2+h2)WW against the SM Higgs boson hypothesis (0+). The expectation for the SM Higgs boson is represented by the yellow histogram on the right and the alternative JP hypothesis by the blue histogram on the left. The red arrow indicates the observed q value. (b) Observed value of 2ΔlnL as a function of f(JP) and the expectation in the SM for the ggX(2+h2)WW alternative JP model.

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Figure 13-a:
(a) Distributions of the test statistic q=2ln(LJP/L0+) as a function of fWWb2 for the hypothesis of the spin-one JP models against the SM Higgs boson hypothesis in the q¯qXWW analysis. (b) Distribution of the test statistic q=2ln(LJP/L0+) as a function of f(q¯q) for the 2+h2 hypothesis against the SM Higgs boson hypothesis in the HWW analysis. The median expectation for the SM Higgs boson is represented by the red squares with the green (68% CL) and yellow (95% CL) solid color regions and for the alternative JP hypotheses by the blue triangles with the red (68% CL) and blue (95% CL) hatched regions. The observed values are indicated by the black dots.

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Figure 13-b:
(a) Distributions of the test statistic q=2ln(LJP/L0+) as a function of fWWb2 for the hypothesis of the spin-one JP models against the SM Higgs boson hypothesis in the q¯qXWW analysis. (b) Distribution of the test statistic q=2ln(LJP/L0+) as a function of f(q¯q) for the 2+h2 hypothesis against the SM Higgs boson hypothesis in the HWW analysis. The median expectation for the SM Higgs boson is represented by the red squares with the green (68% CL) and yellow (95% CL) solid color regions and for the alternative JP hypotheses by the blue triangles with the red (68% CL) and blue (95% CL) hatched regions. The observed values are indicated by the black dots.

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Figure 14:
Distribution of the test statistic q=2ln(LJP/L0+) for the spin-two JP models tested against the SM Higgs boson hypothesis in the XWW analyses. The expected median and the 68.3%, 95.4%, and 99.7% CL regions for the SM Higgs boson (orange, the left for each model) and for the alternative JP hypotheses (blue, right) are shown. The observed q values are indicated by the black dots.

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Figure 15:
Summary of the f(JP) constraints for the spin-one and spin-two models from Tables 8 and 9 in the XWW analyses. The expected 68% and 95% CL regions are shown as the green and yellow bands. The observed constraints at 68% and 95% CL are shown as the points with error bars and the excluded hatched regions.

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Figure 16-a:
Distributions of the test statistic q=2ln(LJP/L0+) in the combination of the XZZ and WW channels for the hypotheses of q¯qX(1+) (a) and ggX(2+h2) (b) tested against the SM Higgs boson hypothesis. The expectation for the SM Higgs boson is represented by the yellow histogram on the right of each plot and the alternative JP hypothesis by the blue histogram on the left. The red arrow indicates the observed q value.

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Figure 16-b:
Distributions of the test statistic q=2ln(LJP/L0+) in the combination of the XZZ and WW channels for the hypotheses of q¯qX(1+) (a) and ggX(2+h2) (b) tested against the SM Higgs boson hypothesis. The expectation for the SM Higgs boson is represented by the yellow histogram on the right of each plot and the alternative JP hypothesis by the blue histogram on the left. The red arrow indicates the observed q value.

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Figure 17-a:
(a) Distributions of the test statistic q=2ln(LJP/L0+) in the combination of the XZZ and WW channels for the hypothesis of ggX(2+m) tested against the SM Higgs boson hypothesis. The expectation for the SM Higgs boson is represented by the yellow histogram on the right and the alternative JP hypothesis by the blue histogram on the left. The red arrow indicates the observed q value. (b) Distribution of q as a function of f(q¯q) for the 2+m hypothesis against the SM Higgs boson hypothesis in the XZZ and WW channels. The median expectation for the SM Higgs boson is represented with the solid green (68% CL) and yellow (95% CL) regions. The alternative 2+m hypotheses are represented by the blue triangles with the red (68% CL) and blue (95% CL) hatched regions. The observed values are indicated by the black dots.

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Figure 17-b:
(a) Distributions of the test statistic q=2ln(LJP/L0+) in the combination of the XZZ and WW channels for the hypothesis of ggX(2+m) tested against the SM Higgs boson hypothesis. The expectation for the SM Higgs boson is represented by the yellow histogram on the right and the alternative JP hypothesis by the blue histogram on the left. The red arrow indicates the observed q value. (b) Distribution of q as a function of f(q¯q) for the 2+m hypothesis against the SM Higgs boson hypothesis in the XZZ and WW channels. The median expectation for the SM Higgs boson is represented with the solid green (68% CL) and yellow (95% CL) regions. The alternative 2+m hypotheses are represented by the blue triangles with the red (68% CL) and blue (95% CL) hatched regions. The observed values are indicated by the black dots.

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Figure 18:
Distributions of the test statistic q=2ln(LJP/L0+) for the spin-one and spin-two JP models tested against the SM Higgs boson hypothesis in the combined XZZ and WW analyses. The expected median and the 68.3%, 95.4%, and 99.7% CL regions for the SM Higgs boson (orange, the left for each model) and for the alternative JP hypotheses (blue, right) are shown. The observed q values are indicated by the black dots.

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Figure 19-a:
(a) Distributions of the test statistic q=2ln(LJP/L0+) in the combination of the XZZ,WW, and γγ channels for the hypothesis of ggX(2+m) tested against the SM Higgs boson hypothesis (0+). The expectation for the SM Higgs boson is represented by the yellow histogram on the right and the alternative JP hypothesis by the blue histogram on the left. The red arrow indicates the observed q value. (b) Distributions of the test statistic q=2ln(LJP/L0+) as a function of f(q¯q) for the hypotheses of the 2+m model tested against the SM Higgs boson hypothesis in the XZZ,WW, and γγ channels. The median expectation for the SM Higgs boson is represented with the solid green (68% CL) and yellow (95% CL) regions. The alternative 2+m hypotheses are represented by the blue triangles with the red (68% CL) and blue (95% CL) hatched regions. The observed values are indicated by the black dots.

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Figure 19-b:
(a) Distributions of the test statistic q=2ln(LJP/L0+) in the combination of the XZZ,WW, and γγ channels for the hypothesis of ggX(2+m) tested against the SM Higgs boson hypothesis (0+). The expectation for the SM Higgs boson is represented by the yellow histogram on the right and the alternative JP hypothesis by the blue histogram on the left. The red arrow indicates the observed q value. (b) Distributions of the test statistic q=2ln(LJP/L0+) as a function of f(q¯q) for the hypotheses of the 2+m model tested against the SM Higgs boson hypothesis in the XZZ,WW, and γγ channels. The median expectation for the SM Higgs boson is represented with the solid green (68% CL) and yellow (95% CL) regions. The alternative 2+m hypotheses are represented by the blue triangles with the red (68% CL) and blue (95% CL) hatched regions. The observed values are indicated by the black dots.

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Figure 20:
Summary of allowed confidence level intervals on anomalous coupling parameters in HVV interactions under the assumption that all the coupling ratios are real (ϕVVai=0 or π). The expected 68% and 95% CL regions are shown as the green and yellow bands. The observed constraints at 68% and 95% CL are shown as the points with errors and the excluded hatched regions. In the case of the fZγΛ1 measurement, there are two minima and two 68%CL intervals, while only one global minimum is indicated with a point. The combination of the HZZ and HWW measurements is presented, assuming the symmetry ai=aWWi, including Rai = 0.5.

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Figure 21-a:
Expected (dashed) and observed (solid) likelihood scans using the template method for the effective fractions fΛ1, fa2, fa3 (from top to bottom) describing HZZ interactions. Plots on the left show the results when the couplings studied are constrained to be real and all other couplings are fixed to the SM predictions. The cosϕai term allows a signed quantity where cosϕai=1 or +1. Plots on the right show the results where the phases of the anomalous couplings and additional HZZ couplings are left unconstrained, as indicated in the legend. The fa3 result with ϕa3 unconstrained (in the bottom-right plot) is from PRD 89 (2014) 092007.

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Figure 21-b:
Expected (dashed) and observed (solid) likelihood scans using the template method for the effective fractions fΛ1, fa2, fa3 (from top to bottom) describing HZZ interactions. Plots on the left show the results when the couplings studied are constrained to be real and all other couplings are fixed to the SM predictions. The cosϕai term allows a signed quantity where cosϕai=1 or +1. Plots on the right show the results where the phases of the anomalous couplings and additional HZZ couplings are left unconstrained, as indicated in the legend. The fa3 result with ϕa3 unconstrained (in the bottom-right plot) is from PRD 89 (2014) 092007.

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Figure 21-c:
Expected (dashed) and observed (solid) likelihood scans using the template method for the effective fractions fΛ1, fa2, fa3 (from top to bottom) describing HZZ interactions. Plots on the left show the results when the couplings studied are constrained to be real and all other couplings are fixed to the SM predictions. The cosϕai term allows a signed quantity where cosϕai=1 or +1. Plots on the right show the results where the phases of the anomalous couplings and additional HZZ couplings are left unconstrained, as indicated in the legend. The fa3 result with ϕa3 unconstrained (in the bottom-right plot) is from PRD 89 (2014) 092007.

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Figure 21-d:
Expected (dashed) and observed (solid) likelihood scans using the template method for the effective fractions fΛ1, fa2, fa3 (from top to bottom) describing HZZ interactions. Plots on the left show the results when the couplings studied are constrained to be real and all other couplings are fixed to the SM predictions. The cosϕai term allows a signed quantity where cosϕai=1 or +1. Plots on the right show the results where the phases of the anomalous couplings and additional HZZ couplings are left unconstrained, as indicated in the legend. The fa3 result with ϕa3 unconstrained (in the bottom-right plot) is from PRD 89 (2014) 092007.

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Figure 21-e:
Expected (dashed) and observed (solid) likelihood scans using the template method for the effective fractions fΛ1, fa2, fa3 (from top to bottom) describing HZZ interactions. Plots on the left show the results when the couplings studied are constrained to be real and all other couplings are fixed to the SM predictions. The cosϕai term allows a signed quantity where cosϕai=1 or +1. Plots on the right show the results where the phases of the anomalous couplings and additional HZZ couplings are left unconstrained, as indicated in the legend. The fa3 result with ϕa3 unconstrained (in the bottom-right plot) is from PRD 89 (2014) 092007.

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Figure 21-f:
Expected (dashed) and observed (solid) likelihood scans using the template method for the effective fractions fΛ1, fa2, fa3 (from top to bottom) describing HZZ interactions. Plots on the left show the results when the couplings studied are constrained to be real and all other couplings are fixed to the SM predictions. The cosϕai term allows a signed quantity where cosϕai=1 or +1. Plots on the right show the results where the phases of the anomalous couplings and additional HZZ couplings are left unconstrained, as indicated in the legend. The fa3 result with ϕa3 unconstrained (in the bottom-right plot) is from PRD 89 (2014) 092007.

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Figure 22-a:
Observed likelihood scans using the template method for pairs of effective fractions fΛ1 vs. fa2, fΛ1 vs. fa3, and fa2 vs. fa3 (from top to bottom) describing HZZ interactions. Plots on the left show the results when the couplings studied are constrained to be real and all other couplings are fixed to the SM predictions. Plots on the right show the results when the phases of the anomalous couplings are left unconstrained. The SM expectations correspond to points (0,0) and the best fit values are shown with the crosses. The confidence level intervals are indicated by the corresponding 2ΔlnL contours.

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Figure 22-b:
Observed likelihood scans using the template method for pairs of effective fractions fΛ1 vs. fa2, fΛ1 vs. fa3, and fa2 vs. fa3 (from top to bottom) describing HZZ interactions. Plots on the left show the results when the couplings studied are constrained to be real and all other couplings are fixed to the SM predictions. Plots on the right show the results when the phases of the anomalous couplings are left unconstrained. The SM expectations correspond to points (0,0) and the best fit values are shown with the crosses. The confidence level intervals are indicated by the corresponding 2ΔlnL contours.

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Figure 22-c:
Observed likelihood scans using the template method for pairs of effective fractions fΛ1 vs. fa2, fΛ1 vs. fa3, and fa2 vs. fa3 (from top to bottom) describing HZZ interactions. Plots on the left show the results when the couplings studied are constrained to be real and all other couplings are fixed to the SM predictions. Plots on the right show the results when the phases of the anomalous couplings are left unconstrained. The SM expectations correspond to points (0,0) and the best fit values are shown with the crosses. The confidence level intervals are indicated by the corresponding 2ΔlnL contours.

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Figure 22-d:
Observed likelihood scans using the template method for pairs of effective fractions fΛ1 vs. fa2, fΛ1 vs. fa3, and fa2 vs. fa3 (from top to bottom) describing HZZ interactions. Plots on the left show the results when the couplings studied are constrained to be real and all other couplings are fixed to the SM predictions. Plots on the right show the results when the phases of the anomalous couplings are left unconstrained. The SM expectations correspond to points (0,0) and the best fit values are shown with the crosses. The confidence level intervals are indicated by the corresponding 2ΔlnL contours.

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Figure 22-e:
Observed likelihood scans using the template method for pairs of effective fractions fΛ1 vs. fa2, fΛ1 vs. fa3, and fa2 vs. fa3 (from top to bottom) describing HZZ interactions. Plots on the left show the results when the couplings studied are constrained to be real and all other couplings are fixed to the SM predictions. Plots on the right show the results when the phases of the anomalous couplings are left unconstrained. The SM expectations correspond to points (0,0) and the best fit values are shown with the crosses. The confidence level intervals are indicated by the corresponding 2ΔlnL contours.

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Figure 22-f:
Observed likelihood scans using the template method for pairs of effective fractions fΛ1 vs. fa2, fΛ1 vs. fa3, and fa2 vs. fa3 (from top to bottom) describing HZZ interactions. Plots on the left show the results when the couplings studied are constrained to be real and all other couplings are fixed to the SM predictions. Plots on the right show the results when the phases of the anomalous couplings are left unconstrained. The SM expectations correspond to points (0,0) and the best fit values are shown with the crosses. The confidence level intervals are indicated by the corresponding 2ΔlnL contours.

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Figure 23-a:
Expected (dashed) and observed (solid) likelihood scans for fa2 (a) and fa3 (b), and observed likelihood scan for the fa2 vs. fa3 fractions (c), obtained using the template method (3D, black) and the multidimensional distribution method (8D, red) in the study of anomalous HZZ interactions. The couplings are constrained to be real.

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Figure 23-b:
Expected (dashed) and observed (solid) likelihood scans for fa2 (a) and fa3 (b), and observed likelihood scan for the fa2 vs. fa3 fractions (c), obtained using the template method (3D, black) and the multidimensional distribution method (8D, red) in the study of anomalous HZZ interactions. The couplings are constrained to be real.

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Figure 23-c:
Expected (dashed) and observed (solid) likelihood scans for fa2 (a) and fa3 (b), and observed likelihood scan for the fa2 vs. fa3 fractions (c), obtained using the template method (3D, black) and the multidimensional distribution method (8D, red) in the study of anomalous HZZ interactions. The couplings are constrained to be real.

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Figure 24-a:
Expected (dashed) and observed (solid) likelihood scans using the template method for the effective fractions fZγΛ1 (a), fZγa2 (b), fZγa3 (c), fγγa2 (d), and fγγa3 (e). The couplings studied are constrained to be real and all other couplings are fixed to the SM predictions. The cosϕVVai term allows a signed quantity where cosϕVVai=1 or+1.

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Figure 24-b:
Expected (dashed) and observed (solid) likelihood scans using the template method for the effective fractions fZγΛ1 (a), fZγa2 (b), fZγa3 (c), fγγa2 (d), and fγγa3 (e). The couplings studied are constrained to be real and all other couplings are fixed to the SM predictions. The cosϕVVai term allows a signed quantity where cosϕVVai=1 or+1.

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Figure 24-c:
Expected (dashed) and observed (solid) likelihood scans using the template method for the effective fractions fZγΛ1 (a), fZγa2 (b), fZγa3 (c), fγγa2 (d), and fγγa3 (e). The couplings studied are constrained to be real and all other couplings are fixed to the SM predictions. The cosϕVVai term allows a signed quantity where cosϕVVai=1 or+1.

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Figure 24-d:
Expected (dashed) and observed (solid) likelihood scans using the template method for the effective fractions fZγΛ1 (a), fZγa2 (b), fZγa3 (c), fγγa2 (d), and fγγa3 (e). The couplings studied are constrained to be real and all other couplings are fixed to the SM predictions. The cosϕVVai term allows a signed quantity where cosϕVVai=1 or+1.

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Figure 24-e:
Expected (dashed) and observed (solid) likelihood scans using the template method for the effective fractions fZγΛ1 (a), fZγa2 (b), fZγa3 (c), fγγa2 (d), and fγγa3 (e). The couplings studied are constrained to be real and all other couplings are fixed to the SM predictions. The cosϕVVai term allows a signed quantity where cosϕVVai=1 or+1.

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Figure 25-a:
Expected (dashed) and observed (solid) likelihood scans for effective fractions fΛ1 (a, b), fa2 (c, d), fa3 (e, f). The couplings studied are constrained to be real and all other anomalous couplings are fixed to the SM predictions. The cosϕai term allows a signed quantity where cosϕai=1 or +1. Plots a, c, and e show the results of the HWWνν analysis expressed in terms of the HWW couplings. Plots b, d, and f show the combined HWW and HZZ result in terms of the HZZ couplings for Rai=0.5. Measurements are shown for each channel separately and two types of combination are present: using aWW1=a1 (red) and without such a constraint (magenta).

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Figure 25-b:
Expected (dashed) and observed (solid) likelihood scans for effective fractions fΛ1 (a, b), fa2 (c, d), fa3 (e, f). The couplings studied are constrained to be real and all other anomalous couplings are fixed to the SM predictions. The cosϕai term allows a signed quantity where cosϕai=1 or +1. Plots a, c, and e show the results of the HWWνν analysis expressed in terms of the HWW couplings. Plots b, d, and f show the combined HWW and HZZ result in terms of the HZZ couplings for Rai=0.5. Measurements are shown for each channel separately and two types of combination are present: using aWW1=a1 (red) and without such a constraint (magenta).

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Figure 25-c:
Expected (dashed) and observed (solid) likelihood scans for effective fractions fΛ1 (a, b), fa2 (c, d), fa3 (e, f). The couplings studied are constrained to be real and all other anomalous couplings are fixed to the SM predictions. The cosϕai term allows a signed quantity where cosϕai=1 or +1. Plots a, c, and e show the results of the HWWνν analysis expressed in terms of the HWW couplings. Plots b, d, and f show the combined HWW and HZZ result in terms of the HZZ couplings for Rai=0.5. Measurements are shown for each channel separately and two types of combination are present: using aWW1=a1 (red) and without such a constraint (magenta).

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Figure 25-d:
Expected (dashed) and observed (solid) likelihood scans for effective fractions fΛ1 (a, b), fa2 (c, d), fa3 (e, f). The couplings studied are constrained to be real and all other anomalous couplings are fixed to the SM predictions. The cosϕai term allows a signed quantity where cosϕai=1 or +1. Plots a, c, and e show the results of the HWWνν analysis expressed in terms of the HWW couplings. Plots b, d, and f show the combined HWW and HZZ result in terms of the HZZ couplings for Rai=0.5. Measurements are shown for each channel separately and two types of combination are present: using aWW1=a1 (red) and without such a constraint (magenta).

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Figure 25-e:
Expected (dashed) and observed (solid) likelihood scans for effective fractions fΛ1 (a, b), fa2 (c, d), fa3 (e, f). The couplings studied are constrained to be real and all other anomalous couplings are fixed to the SM predictions. The cosϕai term allows a signed quantity where cosϕai=1 or +1. Plots a, c, and e show the results of the HWWνν analysis expressed in terms of the HWW couplings. Plots b, d, and f show the combined HWW and HZZ result in terms of the HZZ couplings for Rai=0.5. Measurements are shown for each channel separately and two types of combination are present: using aWW1=a1 (red) and without such a constraint (magenta).

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Figure 25-f:
Expected (dashed) and observed (solid) likelihood scans for effective fractions fΛ1 (a, b), fa2 (c, d), fa3 (e, f). The couplings studied are constrained to be real and all other anomalous couplings are fixed to the SM predictions. The cosϕai term allows a signed quantity where cosϕai=1 or +1. Plots a, c, and e show the results of the HWWνν analysis expressed in terms of the HWW couplings. Plots b, d, and f show the combined HWW and HZZ result in terms of the HZZ couplings for Rai=0.5. Measurements are shown for each channel separately and two types of combination are present: using aWW1=a1 (red) and without such a constraint (magenta).

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Figure 26-a:
Observed conditional likelihood scans of fΛ1 (a, b), fa2 (c, d), fa3 (e, f) for a given Rai value from the combined analysis of the HWW and HZZ channels using the template method. The results are shown with custodial symmetry a1=aWW1 (a, c, e) and without such an assumption (b, d, f). Each cross indicates the minimum value of 2ΔlnL and the contours indicate the one-parameter confidence intervals of fai for a given value of Rai.

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Figure 26-b:
Observed conditional likelihood scans of fΛ1 (a, b), fa2 (c, d), fa3 (e, f) for a given Rai value from the combined analysis of the HWW and HZZ channels using the template method. The results are shown with custodial symmetry a1=aWW1 (a, c, e) and without such an assumption (b, d, f). Each cross indicates the minimum value of 2ΔlnL and the contours indicate the one-parameter confidence intervals of fai for a given value of Rai.

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Figure 26-c:
Observed conditional likelihood scans of fΛ1 (a, b), fa2 (c, d), fa3 (e, f) for a given Rai value from the combined analysis of the HWW and HZZ channels using the template method. The results are shown with custodial symmetry a1=aWW1 (a, c, e) and without such an assumption (b, d, f). Each cross indicates the minimum value of 2ΔlnL and the contours indicate the one-parameter confidence intervals of fai for a given value of Rai.

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Figure 26-d:
Observed conditional likelihood scans of fΛ1 (a, b), fa2 (c, d), fa3 (e, f) for a given Rai value from the combined analysis of the HWW and HZZ channels using the template method. The results are shown with custodial symmetry a1=aWW1 (a, c, e) and without such an assumption (b, d, f). Each cross indicates the minimum value of 2ΔlnL and the contours indicate the one-parameter confidence intervals of fai for a given value of Rai.

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Figure 26-e:
Observed conditional likelihood scans of fΛ1 (a, b), fa2 (c, d), fa3 (e, f) for a given Rai value from the combined analysis of the HWW and HZZ channels using the template method. The results are shown with custodial symmetry a1=aWW1 (a, c, e) and without such an assumption (b, d, f). Each cross indicates the minimum value of 2ΔlnL and the contours indicate the one-parameter confidence intervals of fai for a given value of Rai.

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Figure 26-f:
Observed conditional likelihood scans of fΛ1 (a, b), fa2 (c, d), fa3 (e, f) for a given Rai value from the combined analysis of the HWW and HZZ channels using the template method. The results are shown with custodial symmetry a1=aWW1 (a, c, e) and without such an assumption (b, d, f). Each cross indicates the minimum value of 2ΔlnL and the contours indicate the one-parameter confidence intervals of fai for a given value of Rai.
Tables

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Table 1:
List of anomalous HVV couplings considered in the measurements assuming a spin-zero Higgs boson. The definition of the effective fractions is discussed in the text and the translation constant is given in each case. The effective cross sections correspond to the processes HVV2e2μ and HWWνν and the Higgs boson mass mH=125.6GeV using the JHUGen calculation. The cross-section ratios for the HZγ and Hγγ couplings include the requirement q2V4GeV.

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Table 2:
List of spin-two models with the production and decay couplings of an exotic X particle. The subscripts m (minimal couplings), h (couplings with higher-dimension operators), and b (bulk) distinguish different scenarios.

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Table 3:
Number of background (Bkg.) and signal events expected in the SM, and number of observed candidates, for the HVV4 analysis after the final selection in the mass region 105.6 <m4< 140.6 GeV. The signal and ZZ background are estimated from MC simulation, while the Z+X background is estimated from data. Only systematic uncertainties are quoted.

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Table 4:
Number of background and signal events expected in the SM, and number of observed candidates, for the HWW analysis after final selection. The signal and background are estimated from MC simulation and from data control regions, as discussed in the text. Only systematic uncertainties are quoted.

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Table 5:
Number of background and signal events expected in the SM, and number of observed candidates, for the Hγγ analysis after final selection. The four categories are defined as follows: low |η| indicates that both photons are in the barrel with |η|<1.5 and high |η| otherwise, high R9 indicates that both photons have R9>0.94 and low R9 otherwise. The mγγ range (GeV) centered at mH=125 GeV corresponds to the full width at half maximum for the signal distribution in each category. Only systematic uncertainties are quoted, which include uncertainty from the background mγγ parameterization in the background estimates.

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Table 6:
List of observables x used in the analysis of the HVV couplings. The JP notation for spin-two refers to the ten scenarios defined in Table {table-scenarios}. The Hγγ channel is illustrated with two main observables, where cosθ represents categories constructed from the angular and other observables, and more details are given in Section 3.5 and Ref.[15].

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Table 7:
List of spin-one models tested in the XZZ analysis. The expected separation is quoted for two scenarios, for the signal production cross section obtained from the fit to data for each hypothesis and using the SM expectation (μ=1). The observed separation shows the consistency of the observation with the SM Higgs boson model or the alternative JP model, from which the CLs value is derived. The f(JP) constraints are quoted, where the decay-only measurements are valid for any production (Prod.) mechanism and are performed using the efficiency of the q¯qXZZ selection.

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Table 8:
List of spin-two models tested in the XZZ analysis. The expected separation is quoted for two scenarios, for the signal production cross section obtained from the fit to data for each hypothesis, and using the SM expectation (μ=1). The observed separation shows the consistency of the observation with the SM Higgs boson or an alternative JP model, from which the CLs value is derived. The f(JP) constraints are quoted, where the decay-only measurements are valid for any production (Prod.) mechanism and are performed using the efficiency of the ggXZZ selection. Results from Ref.[12]are explicitly noted.

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Table 9:
List of spin-one models tested in the XWW analysis. The expected separation is quoted for two scenarios, for the signal production cross section obtained from the fit to data for each hypothesis, and using the SM expectation (μ=1). The observed separation shows the consistency of the observation with the SM Higgs boson model or the alternative JP model, from which a CLs value is derived. The constraints on the non-interfering JP fraction are quoted in the last two columns.

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Table 10:
List of spin-two models tested in the XWW analysis. The expected separation is quoted for two scenarios, for the signal production cross section obtained from the fit to data for each hypothesis, and using the SM expectation (μ=1). The observed separation shows the consistency of the observation with the SM Higgs boson or an alternative JP model, from which the CLs value is derived. The constraints on the non-interfering JP fraction are quoted in the last two columns. Results from Ref.[14] are explicitly noted.

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Table 11:
List of spin-one and spin-two models tested in the combination of the XZZ and XWW channels. The combined expected separation is quoted for two scenarios, for the signal production cross section obtained from the fit to data for each hypothesis and using the SM expectation (μ=1). For comparison, the former expectations are also quoted for the individual channels as in Tables 7-10. The observed separation shows the consistency of the observation with the SM Higgs boson model or an alternative JP model, from which the CLs value is derived.

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Table 12:
Results of the study of the 2+m model for the combination of the XZZ, WW, and γγ decay channels. The expected separation is quoted for the three channels separately and for the combination with the signal strength for each hypothesis determined from the fit to data independently in each channel. Also shown in parentheses is the expectation with the SM signal cross section (μ=1). The observed separation shows the consistency of the observation with the SM 0+ model or JP model and corresponds to the scenario where the signal strength is floated in the fit to data.

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Table 13:
Summary of allowed 68%CL (central values with uncertainties) and 95%CL (ranges in square brackets) intervals on anomalous coupling parameters in HVV interactions under the assumption that all the coupling ratios are real (ϕVVai=0 or π). The ranges are truncated at the physical boundaries of fVVai=1. The last column indicates the observed (expected) confidence level of a pure anomalous coupling corresponding to fVVai=1 when compared to the SM expectation fVVai=0. The expected results are quoted for the SM signal production cross section (μ=1). The results are obtained with the template method.

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Table 14:
Summary of the allowed 95\%CL intervals on the anomalous couplings in HZZ interactions using results in Table 13. The coupling ratios are assumed to be real (including cos(ϕΛ1)=0 or π).

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Table 15:
Summary of the allowed 68%CL (central values with uncertainties) and 95%CL (ranges in square brackets) intervals on anomalous coupling parameters in the HZZ interactions under the condition of a given phase of the coupling (0 or π) or when the phase or other parameters are unconstrained (any value allowed). Results are presented with the template method and expectations are quoted in parentheses following the observed values. The results for fa3 with ϕa3 unconstrained are from Ref.[12].

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Table 16:
Summary of the allowed 95\%CL intervals on the anomalous coupling parameters in HZZ interactions under the assumption that all the coupling ratios are real (ϕai=0 or π) using the multidimensional distribution method. These results cross-check those presented in Table 13.

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Table 17:
Summary of the allowed 95\%CL intervals on the anomalous couplings in HZγ and Hγγ interactions using results obtained with the template method in Table 13. The coupling ratios are assumed to be real (cos(ϕVVai)=0 or π).

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Table 18:
Summary of the allowed 95\%CL intervals on the anomalous couplings in HWW interactions using results obtained with the template method in Table 13. The coupling ratios are assumed to be real (including cos(ϕWWΛ1)=0 or π).

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Table 19:
Summary of allowed 68%CL (central values with uncertainties) and 95%CL (ranges in square brackets) intervals on anomalous coupling parameters in HVV interactions in combination of HZZ and HWW measurements assuming the symmetry ai=aWWi, including Rai=0.5, and real coupling ratios (ϕVVai=0 or π). The last column indicates the observed (expected) confidence level of a pure anomalous coupling corresponding to fVVai=1 when compared to the SM expectation fVVai=0. The results are obtained with the template method.

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Table 20:
Summary of the allowed 95\%CL intervals on the anomalous couplings in HVV interactions in combination of HZZ and HWW measurements in Table 19 assuming the symmetry ai=aWWi, including Rai=0.5, and real coupling ratios (ϕVVai=0 or π).
Summary
In this paper, a comprehensive study of the spin-parity properties of the recently discovered H boson and of the tensor structure of its interactions with electroweak gauge bosons is presented using the HZZ,Zγ,γγ4, HWWνν, and Hγγ decay modes. The results are based on the 2011 and 2012 data from pp collisions recorded with the CMS detector at the LHC, and correspond to an integrated luminosity of up to 5.1 fb1 at a center-of-mass energy of 7 TeV and up to 19.7 fb1 at 8 TeV.

The phenomenological formulation for the interactions of a spin-zero, -one, or -two boson with the SM particles is based on a scattering amplitude or, equivalently, an effective field theory Lagrangian, with operators up to dimension five. The dedicated simulation and matrix element likelihood approach for the analysis of the kinematics of H boson production and decay in different topologies are based on this formulation. A maximum likelihood fit of the signal and background distributions provides constraints on the anomalous couplings of the H boson.

The study focuses on testing for the presence of anomalous effects in HZZ and HWW interactions under spin-zero, -one, and -two hypotheses. The combination of the HZZ and HWW measurements leads to tighter constraints on the H boson spin-parity and anomalous HVV interactions. The combination with the Hγγ measurements also allows tighter constraints in the spin-two case. The HZγ and Hγγ interactions are probed for the first time using the 4 final state.

The exotic-spin study covers the analysis of mixed-parity spin-one states and ten spin-two hypotheses under the assumption of production either via gluon fusion or quark-antiquark annihilation, or without such an assumption. The spin-one hypotheses are excluded at a greater than 99.999% CL in the ZZ and WW modes, while in the γγ mode they are excluded by the Landau-Yang theorem. The spin-two boson with gravity-like minimal couplings is excluded at a 99.87% CL, and the other spin-two hypotheses tested are excluded at a 99% CL or higher.

Given the exclusion of the spin-one and spin-two scenarios, constraints are set on the contribution of eleven anomalous couplings to the HZZ, HZγ, Hγγ, and HWW interactions of a spin-zero H boson, as summarized in Table 13. Among these is the measurement of the fa3 parameter, which is defined as the fractional pseudoscalar cross section in the HZZ channel. The constraint is fa3<0.43(0.40) at a 95% CL for the positive (negative) phase of the pseudoscalar coupling with respect to the dominant SM-like coupling and fa3=1 exclusion of a pure pseudoscalar hypothesis at a 99.98% CL.

All observations are consistent with the expectations for a scalar SM-like Higgs boson. It is not presently established that the interactions of the observed state conserve C-parity or CP-parity. However, under the assumption that both quantities are conserved, our measurements require the quantum numbers of the new state to be JPC=0++. The positive P-parity follows from the fVVa3 measurements in the HZZ,Zγ,γγ4, and HWWνν decays and the positive C-parity follows from observation of the Hγγ decay. Further measurements probing the tensor structure of the HVV and Hfˉf interactions can test the assumption of CP invariance.
Compact Muon Solenoid
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