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| CMS-HIG-18-007 ; CERN-EP-2018-221 | ||
| Search for the associated production of the Higgs boson and a vector boson in proton-proton collisions at $\sqrt{s} = $ 13 TeV via Higgs boson decays to $\tau$ leptons | ||
| CMS Collaboration | ||
| 10 September 2018 | ||
| JHEP 06 (2019) 093 | ||
| Abstract: A search for the standard model Higgs boson, decaying to a pair of $\tau$ leptons and produced in association with a W or a Z boson is performed. A data sample of proton-proton collisions collected at $\sqrt{s} = $ 13 TeV by the CMS experiment at the CERN LHC is used, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. The signal strength is measured relative to the expectation for the standard model Higgs boson, yielding $\mu = $ 2.5$ ^{+1.4} _{-1.3}$. These results are combined with earlier CMS measurements targeting Higgs boson decays to a pair of $\tau$ leptons, performed with the same data set in the gluon fusion and vector boson fusion production modes. The combined signal strength is $\mu = $ 1.24$ ^{+0.29} _{-0.27}$ (1.00$ ^{+0.24} _{-0.23}$ expected), and the observed significance is 5.5 standard deviations (4.8 expected) for a Higgs boson mass of 125 GeV. | ||
| Links: e-print arXiv:1809.03590 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
The post-fit $ {m_{{\tau} {\tau}}} $ distributions used to extract the signal shown for (upper left) $\ell \ell {\mathrm {e}} {{\tau} _\mathrm {h}} $, (upper right) $\ell \ell {{\mu}} {{\tau} _\mathrm {h}} $, (lower left) $\ell \ell {{\tau} _\mathrm {h}} {{\tau} _\mathrm {h}} $, and (lower right) $\ell \ell {\mathrm {e}} {{\mu}}$. The uncertainties include both statistical and systematic components. The left half of each distribution is the low $ {L_{\text {T}}^{\text {Higgs}}} $ region, while the right half of each distribution is the high $ {L_{\text {T}}^{\text {Higgs}}} $ region. The WH and ZH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ signal processes are summed together and shown as VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ with a best fit $\mu = $ 2.5. VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ is shown both as a stacked filled histogram and an open overlaid histogram. The contribution from "Other'' includes events from triboson, $ {{\mathrm {t}\overline {\mathrm {t}}}} + {\mathrm {W}}$/$ {\mathrm {Z}} $, $ {{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}} $ production, and all production modes leading to $ {{\mathrm {H}} \to {\mathrm {W}} {\mathrm {W}}} $ and $ {{\mathrm {H}} \to {\mathrm {Z}} {\mathrm {Z}}} $ decays. In these distributions the ZH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ process contributes more than 99% of the total of VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $. |
png pdf |
Figure 1-a:
The post-fit $ {m_{{\tau} {\tau}}} $ distribution used to extract the signal shown for $\ell \ell {\mathrm {e}} {{\tau} _\mathrm {h}} $. The uncertainties include both statistical and systematic components. The left half of the distribution is the low $ {L_{\text {T}}^{\text {Higgs}}} $ region, while the right half is the high $ {L_{\text {T}}^{\text {Higgs}}} $ region. The WH and ZH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ signal processes are summed together and shown as VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ with a best fit $\mu = $ 2.5. VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ is shown both as a stacked filled histogram and an open overlaid histogram. The contribution from "Other'' includes events from triboson, $ {{\mathrm {t}\overline {\mathrm {t}}}} + {\mathrm {W}}$/$ {\mathrm {Z}} $, $ {{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}} $ production, and all production modes leading to $ {{\mathrm {H}} \to {\mathrm {W}} {\mathrm {W}}} $ and $ {{\mathrm {H}} \to {\mathrm {Z}} {\mathrm {Z}}} $ decays. The ZH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ process contributes more than 99% of the total of VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $. |
png pdf |
Figure 1-b:
The post-fit $ {m_{{\tau} {\tau}}} $ distribution used to extract the signal shown for $\ell \ell {{\mu}} {{\tau} _\mathrm {h}} $. The uncertainties include both statistical and systematic components. The left half of the distribution is the low $ {L_{\text {T}}^{\text {Higgs}}} $ region, while the right half is the high $ {L_{\text {T}}^{\text {Higgs}}} $ region. The WH and ZH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ signal processes are summed together and shown as VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ with a best fit $\mu = $ 2.5. VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ is shown both as a stacked filled histogram and an open overlaid histogram. The contribution from "Other'' includes events from triboson, $ {{\mathrm {t}\overline {\mathrm {t}}}} + {\mathrm {W}}$/$ {\mathrm {Z}} $, $ {{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}} $ production, and all production modes leading to $ {{\mathrm {H}} \to {\mathrm {W}} {\mathrm {W}}} $ and $ {{\mathrm {H}} \to {\mathrm {Z}} {\mathrm {Z}}} $ decays. The ZH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ process contributes more than 99% of the total of VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $. |
png pdf |
Figure 1-c:
The post-fit $ {m_{{\tau} {\tau}}} $ distribution used to extract the signal shown for $\ell \ell {{\tau} _\mathrm {h}} {{\tau} _\mathrm {h}} $. The uncertainties include both statistical and systematic components. The left half of the distribution is the low $ {L_{\text {T}}^{\text {Higgs}}} $ region, while the right half is the high $ {L_{\text {T}}^{\text {Higgs}}} $ region. The WH and ZH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ signal processes are summed together and shown as VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ with a best fit $\mu = $ 2.5. VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ is shown both as a stacked filled histogram and an open overlaid histogram. The contribution from "Other'' includes events from triboson, $ {{\mathrm {t}\overline {\mathrm {t}}}} + {\mathrm {W}}$/$ {\mathrm {Z}} $, $ {{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}} $ production, and all production modes leading to $ {{\mathrm {H}} \to {\mathrm {W}} {\mathrm {W}}} $ and $ {{\mathrm {H}} \to {\mathrm {Z}} {\mathrm {Z}}} $ decays. The ZH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ process contributes more than 99% of the total of VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $. |
png pdf |
Figure 1-d:
The post-fit $ {m_{{\tau} {\tau}}} $ distribution used to extract the signal shown for $\ell \ell {\mathrm {e}} {{\mu}}$. The uncertainties include both statistical and systematic components. The left half of the distribution is the low $ {L_{\text {T}}^{\text {Higgs}}} $ region, while the right half is the high $ {L_{\text {T}}^{\text {Higgs}}} $ region. The WH and ZH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ signal processes are summed together and shown as VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ with a best fit $\mu = $ 2.5. VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ is shown both as a stacked filled histogram and an open overlaid histogram. The contribution from "Other'' includes events from triboson, $ {{\mathrm {t}\overline {\mathrm {t}}}} + {\mathrm {W}}$/$ {\mathrm {Z}} $, $ {{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}} $ production, and all production modes leading to $ {{\mathrm {H}} \to {\mathrm {W}} {\mathrm {W}}} $ and $ {{\mathrm {H}} \to {\mathrm {Z}} {\mathrm {Z}}} $ decays. The ZH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ process contributes more than 99% of the total of VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $. |
png pdf |
Figure 2:
The post-fit $ {m_{{\tau} {\tau}}} $ distributions used to extract the signal, shown for all 8 ZH channels combined. The uncertainties include both statistical and systematic components. The left half of the distribution is the low $ {L_{\text {T}}^{\text {Higgs}}} $ region, while the right half corresponds to the high $ {L_{\text {T}}^{\text {Higgs}}} $ region. The definitions of the $ {L_{\text {T}}^{\text {Higgs}}} $ regions in this distribution are the same as those used in Fig. xxxxx and are final state dependent. The WH and ZH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ signal processes are summed together and shown as VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ with a best fit $\mu = $ 2.5. VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ is shown both as a stacked filled histogram and an open overlaid histogram. The contribution from "Other'' includes events from triboson, $ {{\mathrm {t}\overline {\mathrm {t}}}} + {\mathrm {W}}$/$ {\mathrm {Z}} $, $ {{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}} $ production, and all production modes leading to $ {{\mathrm {H}} \to {\mathrm {W}} {\mathrm {W}}} $ and $ {{\mathrm {H}} \to {\mathrm {Z}} {\mathrm {Z}}} $ decays. In this distribution the ZH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ process contributes more than 99% of the total of VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $. |
png pdf |
Figure 3:
Post-fit mass distributions in the $ {\mathrm {e}} {{\mu}} {{\tau} _\mathrm {h}} $ (upper left), $ {{\mu}} {{\mu}} {{\tau} _\mathrm {h}} $ (upper right), $ {\mathrm {e}} {{\tau} _\mathrm {h}} {{\tau} _\mathrm {h}} $ (lower left), and $ {{\mu}} {{\tau} _\mathrm {h}} {{\tau} _\mathrm {h}} $ (lower right) final states. The uncertainties include both statistical and systematic components. The WH and ZH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ signal processes are summed together and shown as VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ with a best fit $\mu = $ 2.5. VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ is shown both as a stacked filled histogram and an open overlaid histogram. The contribution from "Other'' includes events from triboson, $ {{\mathrm {t}\overline {\mathrm {t}}}} + {\mathrm {W}}$/$ {\mathrm {Z}} $, $ {{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}} $ production, and all production modes leading to $ {{\mathrm {H}} \to {\mathrm {W}} {\mathrm {W}}} $ and $ {{\mathrm {H}} \to {\mathrm {Z}} {\mathrm {Z}}} $ decays. In these distribution the $ {\mathrm {W}} {\mathrm {H}} $, $ {{\mathrm {H}} \to {\tau} {\tau}} $ processes contributes 91-93% of the total of VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $. |
png pdf |
Figure 3-a:
Post-fit mass distribution in the $ {\mathrm {e}} {{\mu}} {{\tau} _\mathrm {h}} $. The uncertainties include both statistical and systematic components. The WH and ZH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ signal processes are summed together and shown as VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ with a best fit $\mu = $ 2.5. VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ is shown both as a stacked filled histogram and an open overlaid histogram. The contribution from "Other'' includes events from triboson, $ {{\mathrm {t}\overline {\mathrm {t}}}} + {\mathrm {W}}$/$ {\mathrm {Z}} $, $ {{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}} $ production, and all production modes leading to $ {{\mathrm {H}} \to {\mathrm {W}} {\mathrm {W}}} $ and $ {{\mathrm {H}} \to {\mathrm {Z}} {\mathrm {Z}}} $ decays. The $ {\mathrm {W}} {\mathrm {H}} $, $ {{\mathrm {H}} \to {\tau} {\tau}} $ processes contributes 91-93% of the total of VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $. |
png pdf |
Figure 3-b:
Post-fit mass distribution in the $ {{\mu}} {{\mu}} {{\tau} _\mathrm {h}} $. The uncertainties include both statistical and systematic components. The WH and ZH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ signal processes are summed together and shown as VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ with a best fit $\mu = $ 2.5. VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ is shown both as a stacked filled histogram and an open overlaid histogram. The contribution from "Other'' includes events from triboson, $ {{\mathrm {t}\overline {\mathrm {t}}}} + {\mathrm {W}}$/$ {\mathrm {Z}} $, $ {{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}} $ production, and all production modes leading to $ {{\mathrm {H}} \to {\mathrm {W}} {\mathrm {W}}} $ and $ {{\mathrm {H}} \to {\mathrm {Z}} {\mathrm {Z}}} $ decays. The $ {\mathrm {W}} {\mathrm {H}} $, $ {{\mathrm {H}} \to {\tau} {\tau}} $ processes contributes 91-93% of the total of VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $. |
png pdf |
Figure 3-c:
Post-fit mass distribution in the $ {\mathrm {e}} {{\tau} _\mathrm {h}} {{\tau} _\mathrm {h}} $. The uncertainties include both statistical and systematic components. The WH and ZH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ signal processes are summed together and shown as VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ with a best fit $\mu = $ 2.5. VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ is shown both as a stacked filled histogram and an open overlaid histogram. The contribution from "Other'' includes events from triboson, $ {{\mathrm {t}\overline {\mathrm {t}}}} + {\mathrm {W}}$/$ {\mathrm {Z}} $, $ {{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}} $ production, and all production modes leading to $ {{\mathrm {H}} \to {\mathrm {W}} {\mathrm {W}}} $ and $ {{\mathrm {H}} \to {\mathrm {Z}} {\mathrm {Z}}} $ decays. The $ {\mathrm {W}} {\mathrm {H}} $, $ {{\mathrm {H}} \to {\tau} {\tau}} $ processes contributes 91-93% of the total of VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $. |
png pdf |
Figure 3-d:
Post-fit mass distribution in the $ {{\mu}} {{\tau} _\mathrm {h}} {{\tau} _\mathrm {h}} $. The uncertainties include both statistical and systematic components. The WH and ZH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ signal processes are summed together and shown as VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ with a best fit $\mu = $ 2.5. VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ is shown both as a stacked filled histogram and an open overlaid histogram. The contribution from "Other'' includes events from triboson, $ {{\mathrm {t}\overline {\mathrm {t}}}} + {\mathrm {W}}$/$ {\mathrm {Z}} $, $ {{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}} $ production, and all production modes leading to $ {{\mathrm {H}} \to {\mathrm {W}} {\mathrm {W}}} $ and $ {{\mathrm {H}} \to {\mathrm {Z}} {\mathrm {Z}}} $ decays. The $ {\mathrm {W}} {\mathrm {H}} $, $ {{\mathrm {H}} \to {\tau} {\tau}} $ processes contributes 91-93% of the total of VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $. |
png pdf |
Figure 4:
Post-fit mass distributions of the four $ {\mathrm {W}} {\mathrm {H}} $ final states combined together. The uncertainties include both statistical and systematic components. The $ {\mathrm {W}} {\mathrm {H}} $ and ZH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ signal processes are summed together and shown as VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ with a best fit $\mu = $ 2.5. VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $ is shown both as a stacked filled histogram and an open overlaid histogram. The contribution from "Other'' includes events from triboson, $ {{\mathrm {t}\overline {\mathrm {t}}}} + {\mathrm {W}}$/$ {\mathrm {Z}} $, $ {{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}} $ production, and all production modes leading to $ {{\mathrm {H}} \to {\mathrm {W}} {\mathrm {W}}} $ and $ {{\mathrm {H}} \to {\mathrm {Z}} {\mathrm {Z}}} $ decays. In this distribution the $ {\mathrm {W}} {\mathrm {H}} $, $ {{\mathrm {H}} \to {\tau} {\tau}} $ process contributes 92% of the total of VH, $ {{\mathrm {H}} \to {\tau} {\tau}} $. |
png pdf |
Figure 5:
Distribution of the decimal logarithm of the ratio between the expected signal and the sum of the expected signal and background. The signal, corresponding to the best fit value $\mu =2.5$, and expected background in each bin of the mass distributions used to extract the results, in all final states are combined. The background contributions are separated based on the analysis channel, $ {\mathrm {W}} {\mathrm {H}} $ or ZH. The inset shows the corresponding difference between the data and expected background distributions divided by the background expectation, as well as the signal expectation divided by the background expectation. |
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Figure 6:
Best fit signal strength per Higgs boson production process, for $ {m_{{\mathrm {H}}}} = 125$ GeV, using a combination of the $ {\mathrm {W}} {\mathrm {H}} $ and ZH targeted analysis detailed in this paper with the CMS analysis performed in the same data set for the same decay mode but targeting the gluon fusion and vector boson fusion production mechanisms [19]. The constraints from the combined global fit are used to extract each of the individual best fit signal strengths. The combined best fit signal strength is $\mu = 1.24 ^{+0.29} _{-0.27}$. |
png pdf |
Figure 7:
Scans of the negative log-likelihood difference as a function of $\kappa _V$ and $\kappa _f$, for $ {m_{{\mathrm {H}}}} = $ 125 GeV. Contours corresponding to confidence levels ({\text {CL}}) of 68 and 95% are shown. All nuisance parameters are profiled for each point. The scan labeled as "Combined'' is a combination of the $ {\mathrm {W}} {\mathrm {H}} $ and ZH targeted analysis detailed in this paper with the CMS analysis performed in the same data set for the same decay mode but targeting the gluon fusion and vector boson fusion production mechanisms [19]. The results for the gluon fusion and vector boson fusion analysis are represented by the dashed lines and are labeled as "$ {\mathrm {g}} {\mathrm {g}} {\mathrm {H}} +\textrm {VBF}$''. For these scans, the included $ {{\mathrm {H}} \to {\mathrm {W}} {\mathrm {W}}} $ and $ {{\mathrm {H}} \to {\mathrm {Z}} {\mathrm {Z}}} $ processes are treated as signal. |
| Tables | |
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Table 1:
Kinematic selection requirements for WH and ZH events. The trigger requirement is defined by a combination of trigger candidates with $ {p_{\mathrm {T}}} $ over a given threshold (in GeV), indicated inside parentheses. The $ | \eta |$ thresholds come from trigger and object reconstruction constraints. ZH events are selected with either a lower $ {p_{\mathrm {T}}} $ threshold double lepton trigger or a higher $ {p_{\mathrm {T}}} $ threshold single lepton trigger. |
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Table 2:
Sources of systematic uncertainty. The sign $\dagger $ marks the uncertainties that are both shape- and rate-based. Uncertainties that affect only the normalizations have no marker. For the shape and normalization uncertainties, the magnitude column lists the range of the associated change in normalization, which varies by process and final state. The last column specifies the processes affected by each source of uncertainty. |
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Table 3:
Background and signal expectations for the ZH channels, together with the numbers of observed events, for the post-fit signal region distributions. The ZH final states are each grouped according to the Higgs boson decay products. The $\ell \ell $ notation covers both $ {\mathrm {Z}} \to {{\mu}} {{\mu}}$ and $ {\mathrm {Z}} \to {\mathrm {e}} {\mathrm {e}}$ events. The signal yields are the numbers of expected signal events for a Higgs boson with a mass $ {m_{{\mathrm {H}}}} = $ 125 GeV. The background uncertainty accounts for all sources of background uncertainty, systematic as well as statistical, after the global fit. The contribution from "Other'' includes events from triboson, $ {{\mathrm {t}\overline {\mathrm {t}}}} + {\mathrm {W}}$/$ {\mathrm {Z}} $, $ {{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}} $ production, and all production modes leading to $ {{\mathrm {H}} \to {\mathrm {W}} {\mathrm {W}}} $ and $ {{\mathrm {H}} \to {\mathrm {Z}} {\mathrm {Z}}} $ decays. |
png pdf |
Table 4:
Background and signal expectations for the WH channels, together with the numbers of observed events, for the post-fit signal region distributions. The signal yields are the numbers of expected signal events for a Higgs boson with a mass $ {m_{{\mathrm {H}}}} = $ 125 GeV. The background uncertainty accounts for all sources of background uncertainty, systematic as well as statistical, after the global fit. The contributions from triboson, $ {{\mathrm {t}\overline {\mathrm {t}}}} + {\mathrm {W}}$/$ {\mathrm {Z}} $, $ {{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}} $ production, and all production modes leading to $ {{\mathrm {H}} \to {\mathrm {W}} {\mathrm {W}}} $ and $ {{\mathrm {H}} \to {\mathrm {Z}} {\mathrm {Z}}} $ decays are included in the category labeled "Other''. |
| Summary |
|
A search is presented for the standard model (SM) Higgs boson in WH and ZH associated production processes, based on data collected in proton-proton collisions by the CMS detector in 2016 at a center-of-mass energy of 13 TeV. Event categories are defined by three-lepton final states targeting WH production, and four-lepton final states targeting ZH production. The best fit signal strength is $\mu = $ 2.5$ ^{+1.4} _{-1.3}$ (1.0$ ^{+1.1} _{-1.0}$ expected) for a significance of 2.3 standard deviations (1.0 expected). The results of this analysis are combined with those of the CMS analysis targeting gluon fusion and vector boson fusion production, also performed at a center-of-mass energy of 13 TeV, and constraints on the ${\mathrm{H}\to\tau\tau} $ decay rate are set. The best fit signal strength is $\mu = $ 1.24$ ^{+0.29} _{-0.27}$ (1.00$ ^{+0.24} _{-0.23}$ expected), and the observed significance is 5.5 standard deviations (4.8 expected) for a Higgs boson mass of 125 GeV. This combination further constrains the coupling of the Higgs boson to vector bosons, resulting in measured couplings that are consistent with SM predictions within one standard deviation, providing increased confidence that the Higgs boson couples to $\tau$ leptons through a Yukawa coupling as predicted in the SM. The combination allows for extraction of the signal strengths for the four leading Higgs boson production processes using exclusively ${\mathrm{H}\to\tau\tau} $ targeted final states, the results of which are largely consistent with the SM. The measurements of the Higgs boson production mechanisms using ${\mathrm{H}\to\tau\tau} $ decays are the best results to date for the WH and ZH associated production mechanisms using the ${\mathrm{H}\to\tau\tau} $ process. |
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