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CMS-HIG-17-034 ; CERN-EP-2019-029
Constraints on anomalous HVV couplings from the production of Higgs bosons decaying to ττ lepton pairs
Phys. Rev. D 100 (2019) 112002
Abstract: A study is presented of anomalous HVV interactions of the Higgs boson, including its CP properties. The study uses Higgs boson candidates produced mainly in vector boson fusion and gluon fusion that subsequently decay to a pair of ττ leptons. The data were recorded by the CMS experiment at the LHC in 2016 at a center-of-mass energy of 13 TeV and correspond to an integrated luminosity of 35.9 fb11. A matrix element technique is employed for the analysis of anomalous interactions. The results are combined with those from the H4H4 decay channel presented earlier, yielding the most stringent constraints on anomalous Higgs boson couplings to electroweak vector bosons expressed as effective cross-section fractions and phases: the CP-violating parameter fa3cos(ϕa3)=(0.00±0.27)×103fa3cos(ϕa3)=(0.00±0.27)×103 and the CP-conserving parameters fa2cos(ϕa2)=(0.08+1.040.21)×103fa2cos(ϕa2)=(0.08+1.040.21)×103, fΛ1cos(ϕΛ1)=(0.00+0.530.09)×103fΛ1cos(ϕΛ1)=(0.00+0.530.09)×103, and fZγΛ1cos(ϕZγΛ1)=(0.0+1.11.3)×103fZγΛ1cos(ϕZγΛ1)=(0.0+1.11.3)×103. The current data set does not allow for precise constraints on CP properties in the gluon fusion process. The results are consistent with standard model expectations.
Figures & Tables Summary Additional Figures References CMS Publications
Figures

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Figure 1:
Examples of leading-order Feynman diagrams for H boson production via the gluon fusion (left), vector boson fusion (middle), and associated production with a vector boson (right). The HWW and HZZ couplings may appear at tree level, as the SM predicts. Additionally, HWW, HZZ, HZγγ, Hγγγγ, and Hgg couplings may be generated by loops of SM or unknown particles, as indicated in the left diagram but not shown explicitly in the middle and right diagrams.

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Figure 1-a:
Example of leading-order Feynman diagram for H boson production via the gluon fusion. The HWW, HZZ, HZγγ, Hγγγγ, and Hgg couplings may be generated by loops of SM or unknown particles, as indicated in the diagram.

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Figure 1-b:
Example of leading-order Feynman diagram for H boson production via vector boson fusion. The HWW and HZZ couplings may appear at tree level, as the SM predicts.

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Figure 1-c:
Example of leading-order Feynman diagram for H boson production via associated production with a vector boson. The HWW and HZZ couplings may appear at tree level, as the SM predicts.

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Figure 2:
Illustrations of H boson production in qqgg(qq)H(qq)ττ(qq) or VBF qqVV(qq)H(qq)ττ(qq) (left) and in associated production qˉqVVHqˉqττ (right). The Hττ decay is shown without further illustrating the τ decay chain. Angles and invariant masses fully characterize the orientation of the production and two-body decay chain and are defined in suitable rest frames of the V and H bosons, except in the VBF case, where only the H boson rest frame is used [26,28].

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Figure 2-a:
Illustration of H boson production in qqgg(qq)H(qq)ττ(qq) or VBF qqVV(qq)H(qq)ττ(qq). The Hττ decay is shown without further illustrating the τ decay chain. Angles and invariant masses fully characterize the orientation of the production and two-body decay chain and are defined in suitable rest frames of the V and H bosons, except in the VBF case, where only the H boson rest frame is used.

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Figure 2-b:
Illustration of H boson production in associated production qˉqVVHqˉqττ.

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Figure 3:
The distributions of mvis and mττ in the 0-jet category of the eτh+μτh (left) and τhτh (right) decay channels. The BSM hypothesis corresponds to fa3= 1.

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Figure 3-a:
The distribution of mvis and mττ in the 0-jet category of the eτh+μτh decay channel. The BSM hypothesis corresponds to fa3= 1.

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Figure 3-b:
The distribution of mvis and mττ in the 0-jet category of the τhτh decay channel. The BSM hypothesis corresponds to fa3= 1.

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Figure 4:
The distributions of transverse momentum of the H boson in the boosted category of the eτh+μτh+eμ (left) and τhτh (right) decay channels. The BSM hypothesis corresponds to fa3= 1.

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Figure 4-a:
The distribution of transverse momentum of the H boson in the boosted category of the eτh+μτh+eμ decay channel. The BSM hypothesis corresponds to fa3= 1.

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Figure 4-b:
The distribution of transverse momentum of the H boson in the boosted category of the τhτh decay channel. The BSM hypothesis corresponds to fa3= 1.

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Figure 5:
The distributions of D0, DCP, D0h+, DΛ1, and DZγΛ1 in the VBF category. All four decay channels, eμ, eτh, μτh, and τhτh, are summed. The BSM hypothesis depends on the variable shown: it corresponds to fa3= 1 for the D0 (upper left) distributions, the maximal mixing ("BSM mix") in VBF production for the DCP distribution (upper right), fa2= 1 for the D0h+ distribution (middle left), fΛ1= 1 for the DΛ1 distribution (middle right), and fZγΛ1= 1 for the DZγΛ1 distribution (lower).

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Figure 5-a:
The distribution of D0 in the VBF category. All four decay channels, eμ, eτh, μτh, and τhτh, are summed. The BSM hypothesis shown corresponds to fa3= 1.

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Figure 5-b:
The distribution of DCP in the VBF category. All four decay channels, eμ, eτh, μτh, and τhτh, are summed. The BSM hypothesis shown corresponds to the maximal mixing ("BSM mix") in VBF production.

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Figure 5-c:
The distribution of D0h+ in the VBF category. All four decay channels, eμ, eτh, μτh, and τhτh, are summed. The BSM hypothesis shown corresponds to fa2= 1.

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Figure 5-d:
The distribution of DΛ1 in the VBF category. All four decay channels, eμ, eτh, μτh, and τhτh, are summed. The BSM hypothesis shown corresponds to fΛ1= 1.

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Figure 5-e:
The distribution of DZγΛ1 in the VBF category. All four decay channels, eμ, eτh, μτh, and τhτh, are summed. The BSM hypothesis shown corresponds to fZγΛ1= 1.

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Figure 6:
Observed and expected distributions in the VBF category in bins of mττ, mJJ, and D0 in the fa3 analysis for the eμ+eτh+μτh (upper) and τhτh (middle and lower) decay channels.

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Figure 6-a:
Observed and expected distributions in the VBF category in bins of mττ, mJJ, and D0 in the fa3 analysis for the eμ+eτh+μτh decay channel.

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Figure 6-b:
Observed and expected distributions in the VBF category in bins of mττ, mJJ, and D0 in the fa3 analysis for the τhτh decay channel.

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Figure 6-c:
Observed and expected distributions in the VBF category in bins of mττ, mJJ, and D0 in the fa3 analysis for the τhτh decay channel.

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Figure 7:
Observed and expected distributions in the VBF category in bins of mττ, mJJ, and D0h+ in the fa2 analysis for the eμ+eτh+μτh (upper) and τhτh (middle and lower) decay channels.

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Figure 7-a:
Observed and expected distributions in the VBF category in bins of mττ, mJJ, and D0h+ in the fa2 analysis for the eμ+eτh+μτh decay channel.

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Figure 7-b:
Observed and expected distributions in the VBF category in bins of mττ, mJJ, and D0h+ in the fa2 analysis for the τhτh decay channel.

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Figure 7-c:
Observed and expected distributions in the VBF category in bins of mττ, mJJ, and D0h+ in the fa2 analysis for the τhτh decay channel.

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Figure 8:
Observed and expected distributions in the VBF category in bins of mττ, mJJ, and DΛ1 in the fΛ1 analysis for the eμ+eτh+μμ (upper) and τhτh (middle and lower) decay channels.

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Figure 8-a:
Observed and expected distributions in the VBF category in bins of mττ, mJJ, and DΛ1 in the fΛ1 analysis for the eμ+eτh+μμ decay channel.

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Figure 8-b:
Observed and expected distributions in the VBF category in bins of mττ, mJJ, and DΛ1 in the fΛ1 analysis for the τhτh decay channel.

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Figure 8-c:
Observed and expected distributions in the VBF category in bins of mττ, mJJ, and DΛ1 in the fΛ1 analysis for the τhτh decay channel.

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Figure 9:
Observed and expected distributions in the VBF category in bins of mττ, mJJ, and DZγΛ1 in the fZγΛ1 analysis for the eμ+eτh+τhτh (upper) and τhτh (middle and lower) decay channels.

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Figure 9-a:
Observed and expected distributions in the VBF category in bins of mττ, mJJ, and DZγΛ1 in the fZγΛ1 analysis for the eμ+eτh+τhτh decay channel.

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Figure 9-b:
Observed and expected distributions in the VBF category in bins of mττ, mJJ, and DZγΛ1 in the fZγΛ1 analysis for the τhτh decay channel.

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Figure 9-c:
Observed and expected distributions in the VBF category in bins of mττ, mJJ, and DZγΛ1 in the fZγΛ1 analysis for the τhτh decay channel.

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Figure 10:
Observed (solid) and expected (dashed) likelihood scans of fa3cos(ϕa3) (top left), fa2cos(ϕa2) (top right), fΛ1cos(ϕΛ1) (bottom left), and fZγΛ1cos(ϕZγΛ1) (bottom right).

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Figure 10-a:
Observed (solid) and expected (dashed) likelihood scans of fa3cos(ϕa3).

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Figure 10-b:
Observed (solid) and expected (dashed) likelihood scans of fa2cos(ϕa2).

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Figure 10-c:
Observed (solid) and expected (dashed) likelihood scans of fΛ1cos(ϕΛ1).

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Figure 10-d:
Observed (solid) and expected (dashed) likelihood scans of fZγΛ1cos(ϕZγΛ1).

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Figure 11:
Combination of results using the Hττ decay (presented in this paper) and the H4 decay [17]. The observed (solid) and expected (dashed) likelihood scans of fa3cos(ϕa3) (top left), fa2cos(ϕa2) (top right), fΛ1cos(ϕΛ1) (bottom left), and fZγΛ1cos(ϕZγΛ1) (bottom right) are shown. For better visibility of all features, the x- and y-axes are presented with variable scales. On the linear-scale x-axis, a zoom is applied in the range 0.03 to +0.03. The y-axis is shown in linear (logarithmic) scale for values of 2ΔlnL below (above) 11.

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Figure 11-a:
Combination of results using the Hττ decay (presented in this paper) and the H4 decay [17]. Shown is the observed (solid) and expected (dashed) likelihood scan of fa3cos(ϕa3). For better visibility of all features, the x- and y-axes are presented with variable scales. On the linear-scale x-axis, a zoom is applied in the range 0.03 to +0.03. The y-axis is shown in linear (logarithmic) scale for values of 2ΔlnL below (above) 11.

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Figure 11-b:
Combination of results using the Hττ decay (presented in this paper) and the H4 decay [17]. Shown is the observed (solid) and expected (dashed) likelihood scan of fa2cos(ϕa2). For better visibility of all features, the x- and y-axes are presented with variable scales. On the linear-scale x-axis, a zoom is applied in the range 0.03 to +0.03. The y-axis is shown in linear (logarithmic) scale for values of 2ΔlnL below (above) 11.

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Figure 11-c:
Combination of results using the Hττ decay (presented in this paper) and the H4 decay [17]. Shown is the observed (solid) and expected (dashed) likelihood scan of fΛ1cos(ϕΛ1). For better visibility of all features, the x- and y-axes are presented with variable scales. On the linear-scale x-axis, a zoom is applied in the range 0.03 to +0.03. The y-axis is shown in linear (logarithmic) scale for values of 2ΔlnL below (above) 11.

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Figure 11-d:
Combination of results using the Hττ decay (presented in this paper) and the H4 decay [17]. Shown is the observed (solid) and expected (dashed) likelihood scan of fZγΛ1cos(ϕZγΛ1). For better visibility of all features, the x- and y-axes are presented with variable scales. On the linear-scale x-axis, a zoom is applied in the range 0.03 to +0.03. The y-axis is shown in linear (logarithmic) scale for values of 2ΔlnL below (above) 11.
Tables

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Table 1:
Kinematic selection criteria for the four decay channels. For the trigger threshold requirements, the numbers indicate the trigger thresholds in GeV. The lepton selection criteria include the transverse momentum threshold, pseudorapidity range, as well as isolation criteria.

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Table 2:
Allowed 68% CL (central values with uncertainties) and 95% CL (in square brackets) intervals on anomalous coupling parameters using the Hττ decay. The observed 95% CL constraints on fa3cos(ϕa3) and fa2cos(ϕa2) allow the full physics range [1,1].

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Table 3:
Allowed 68% CL (central values with uncertainties) and 95% CL (in square brackets) intervals on anomalous coupling parameters using a combination of the Hττ and H4 [17] decay channels.

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Table 4:
Summary of the allowed 95% CL intervals for the anomalous HVV couplings using the results in Table 3. The coupling ratios are assumed to be real and include the factor cos(ϕΛ1) or cos(ϕZγΛ1)=±1.
Summary
A study is presented of anomalous HVV interactions of the H boson with vector bosons V, including CP violation, using its associated production with two hadronic jets in vector boson fusion, in the VH process, and in gluon fusion, and subsequently decaying to a pair of τ leptons. Constraints on the CP-violating parameter fa3 and on the CP-conserving parameters fa2, fΛ1, and fZγΛ1, defined in Eqs. (2) and (3), are set using matrix element techniques. The observed and expected limits on the parameters are summarized in Table 2. The 68% confidence level constraints are generally tighter than those from previous measurements using either production or decay information. Further constraints are obtained in the combination of the Hττ and H4 decay [17] channels and are summarized in Table 3. This combination places the most stringent constraints on anomalous H boson couplings: fa3cos(ϕa3)=(0.00±0.27)×103, fa2cos(ϕa2)=(0.08+1.040.21)×103, fΛ1cos(ϕΛ1)=(0.00+0.530.09)×103, and fZγΛ1cos(ϕZγΛ1)=(0.0+1.11.3)×103. A simultaneous measurement of fa3 and fggHa3 parameters is performed, where the latter parameter, defined in Eqs. (2) and (4), is sensitive to CP violation effects in the gluon fusion process. The current data set does not allow for precise constraints on CP properties in the gluon fusion process. The results are consistent with expectations for the standard model H boson .
Additional Figures

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Additional Figure 1:
Summary of confidence level intervals of anomalous coupling parameters in HVV interactions under the assumption that all the coupling ratios are real (ϕVVai= 0 or π). The HZZ+HWW coupling limits assume that aZZi=aWWi. The expected 68% and 95% CL regions are shown as green and yellow bands. The observed intervals for 68% CL are shown as points with error bars, and the hatched areas indicate the excluded regions at 95% CL. The limits on fZγ,γγa2,3 are from Ref. [13], and the limits on fΛQ are from Ref. [14].
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Compact Muon Solenoid
LHC, CERN