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| CMS-PAS-HIG-24-019 | ||
| Measurement of the charge asymmetry in WH production in the $ \mathrm{H} \to \tau\tau $ decay channel | ||
| CMS Collaboration | ||
| 2025-07-14 | ||
| Abstract: We are presenting a measurement of the charge asymmetry in $ \mathrm{WH} $ production based on the full LHC Run-2 data set of proton-proton collisions at a center-of-mass energy of 13 TeV collected with the CMS experiment in the years 2016-2018. The data set corresponds to an integrated luminosity of 138 fb$^{-1} $. Events are selected requiring three charged leptons, targeting the $ \mathrm{H}\to\tau\tau $ decay channel, where the $ \tau\tau $ system decays into hadrons or a hadron and an electron or a muon and neutrinos and the associated W boson decays into an electron or muon. The results are presented in the form of cross sections for $ \mathrm{W^{+}H} $ and $ \mathrm{W^{-}H} $ production, a cross section for $ \mathrm{WH} $ production, and the charge asymmetry $ A $. The observed charge asymmetry is constrained to be in the range $ A > -$0.09 (95% CL) and in agreement with the expectation from the standard model. The WH cross section is measured to be $ \sigma(\mathrm{WH}) = $ 0.97 $ ^{+0.86}_{-0.82} $ pb which is as well consistent with the expected value in the standard model: $ \sigma(\mathrm{WH}) = $ 1.36 $ \pm $ 0.03 pb. | ||
| Links: CDS record (PDF) ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Processes for H boson production in association with a W boson. On the left the leading order process is shown. On the right a process is shown through which a dependence on $ Y_{\mathrm{c}} $ enters for $ \mathrm{q'=\mathrm{d}} $ and $ \mathrm{ q}=\mathrm{c} $. |
png pdf |
Figure 1-a:
Processes for H boson production in association with a W boson. On the left the leading order process is shown. On the right a process is shown through which a dependence on $ Y_{\mathrm{c}} $ enters for $ \mathrm{q'=\mathrm{d}} $ and $ \mathrm{ q}=\mathrm{c} $. |
png pdf |
Figure 1-b:
Processes for H boson production in association with a W boson. On the left the leading order process is shown. On the right a process is shown through which a dependence on $ Y_{\mathrm{c}} $ enters for $ \mathrm{q'=\mathrm{d}} $ and $ \mathrm{ q}=\mathrm{c} $. |
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Figure 2:
Illustration of the $ F_{\mathrm{F}} $-method as adapted to this analysis. |
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Figure 3:
Post-fit distributions of $ \hat{y}_{l}(\,\cdot\,) $ in the (upper row) WH signal, and (lower row) WZ and $ F_{\mathrm{F}} $ background categories, for all final states and data-taking years combined. For the statistical inference the NN output classes have been split by the charge of the lepton associated with the W boson candidate, with positive charge on the left and negative charge on the right. The points with error bars correspond to the yields in data, while the filled histograms correspond to the estimates of all relevant processes of the data model as described in Section 5 |
png pdf |
Figure 3-a:
Post-fit distributions of $ \hat{y}_{l}(\,\cdot\,) $ in the (upper row) WH signal, and (lower row) WZ and $ F_{\mathrm{F}} $ background categories, for all final states and data-taking years combined. For the statistical inference the NN output classes have been split by the charge of the lepton associated with the W boson candidate, with positive charge on the left and negative charge on the right. The points with error bars correspond to the yields in data, while the filled histograms correspond to the estimates of all relevant processes of the data model as described in Section 5 |
png pdf |
Figure 3-b:
Post-fit distributions of $ \hat{y}_{l}(\,\cdot\,) $ in the (upper row) WH signal, and (lower row) WZ and $ F_{\mathrm{F}} $ background categories, for all final states and data-taking years combined. For the statistical inference the NN output classes have been split by the charge of the lepton associated with the W boson candidate, with positive charge on the left and negative charge on the right. The points with error bars correspond to the yields in data, while the filled histograms correspond to the estimates of all relevant processes of the data model as described in Section 5 |
png pdf |
Figure 3-c:
Post-fit distributions of $ \hat{y}_{l}(\,\cdot\,) $ in the (upper row) WH signal, and (lower row) WZ and $ F_{\mathrm{F}} $ background categories, for all final states and data-taking years combined. For the statistical inference the NN output classes have been split by the charge of the lepton associated with the W boson candidate, with positive charge on the left and negative charge on the right. The points with error bars correspond to the yields in data, while the filled histograms correspond to the estimates of all relevant processes of the data model as described in Section 5 |
png pdf |
Figure 3-d:
Post-fit distributions of $ \hat{y}_{l}(\,\cdot\,) $ in the (upper row) WH signal, and (lower row) WZ and $ F_{\mathrm{F}} $ background categories, for all final states and data-taking years combined. For the statistical inference the NN output classes have been split by the charge of the lepton associated with the W boson candidate, with positive charge on the left and negative charge on the right. The points with error bars correspond to the yields in data, while the filled histograms correspond to the estimates of all relevant processes of the data model as described in Section 5 |
png pdf |
Figure 3-e:
Post-fit distributions of $ \hat{y}_{l}(\,\cdot\,) $ in the (upper row) WH signal, and (lower row) WZ and $ F_{\mathrm{F}} $ background categories, for all final states and data-taking years combined. For the statistical inference the NN output classes have been split by the charge of the lepton associated with the W boson candidate, with positive charge on the left and negative charge on the right. The points with error bars correspond to the yields in data, while the filled histograms correspond to the estimates of all relevant processes of the data model as described in Section 5 |
png pdf |
Figure 3-f:
Post-fit distributions of $ \hat{y}_{l}(\,\cdot\,) $ in the (upper row) WH signal, and (lower row) WZ and $ F_{\mathrm{F}} $ background categories, for all final states and data-taking years combined. For the statistical inference the NN output classes have been split by the charge of the lepton associated with the W boson candidate, with positive charge on the left and negative charge on the right. The points with error bars correspond to the yields in data, while the filled histograms correspond to the estimates of all relevant processes of the data model as described in Section 5 |
png pdf |
Figure 4:
Observed two-dimensional profile likelihood scans for $ A $ and $ \sigma(\mathrm{W}\mathrm{H}) $ on the left and $ \mu(\mathrm{W^+}\mathrm{H}) $ and $ \mu(\mathrm{W^-}\mathrm{H}) $ on the right. The likelihood values are overlayed with 68% (solid line) and 95% (dashed line) confidence level contours obtained from the crossings of the likelihood at $ -2\Delta \, \mathrm{lnL} = $ 2.3 and $ -2\Delta \, \mathrm{lnL} = $ 6, respectively. For the likelihood evaluation all nuisance parameters are profiled in each point in the plane. The black cross represents the best-fit value and the minimum of the likelihood, while the red diamond corresponds to the SM expectation. |
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Figure 4-a:
Observed two-dimensional profile likelihood scans for $ A $ and $ \sigma(\mathrm{W}\mathrm{H}) $ on the left and $ \mu(\mathrm{W^+}\mathrm{H}) $ and $ \mu(\mathrm{W^-}\mathrm{H}) $ on the right. The likelihood values are overlayed with 68% (solid line) and 95% (dashed line) confidence level contours obtained from the crossings of the likelihood at $ -2\Delta \, \mathrm{lnL} = $ 2.3 and $ -2\Delta \, \mathrm{lnL} = $ 6, respectively. For the likelihood evaluation all nuisance parameters are profiled in each point in the plane. The black cross represents the best-fit value and the minimum of the likelihood, while the red diamond corresponds to the SM expectation. |
png pdf |
Figure 4-b:
Observed two-dimensional profile likelihood scans for $ A $ and $ \sigma(\mathrm{W}\mathrm{H}) $ on the left and $ \mu(\mathrm{W^+}\mathrm{H}) $ and $ \mu(\mathrm{W^-}\mathrm{H}) $ on the right. The likelihood values are overlayed with 68% (solid line) and 95% (dashed line) confidence level contours obtained from the crossings of the likelihood at $ -2\Delta \, \mathrm{lnL} = $ 2.3 and $ -2\Delta \, \mathrm{lnL} = $ 6, respectively. For the likelihood evaluation all nuisance parameters are profiled in each point in the plane. The black cross represents the best-fit value and the minimum of the likelihood, while the red diamond corresponds to the SM expectation. |
| Tables | |
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Table 1:
Final state dependent selection requirements in addition to the object definitions given in Section 3. For $ p_{\mathrm{T}} $ the values correspond to the triggering lepton for the data-taking years 2016, 2017, and 2018, respectively, the values in parentheses correspond to the non-triggering lepton and do not depend on the data-taking year. In the $ \ell\ell\tau_\mathrm{h} $ final states the light leptons are required to be of same charges, the $ \tau_\mathrm{h} $ candidate of opposite charge to the light leptons. In the $ \ell\tau_\mathrm{h}\tau_\mathrm{h} $ final states the $ \tau_\mathrm{h} $ candidates are required to be of opposite charges. A more detailed discussion is given in the text. |
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Table 2:
Summary of the most important systematic uncertainties discussed in the text. The columns indicate the source of uncertainty, the variation, and how it is correlated. A checkmark is given also for partial correlations. More details are given in the text. |
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Table 3:
Measured and expected values for the cross sections and signal strengths of $ \mathrm{W^+}\mathrm{H} $, $ \mathrm{W^-}\mathrm{H} $ and WH production and $ A $ as defined in Eq. (1). The uncertainties include statistical and systematic uncertainties. For the cross sections and A also a column with expected values and only theory uncertainties are given [34]. As $ A $ and $ \sigma(\mathrm{W^-}\mathrm{H}) $ are measured outside their phyiscal boundaries, the measurements are interpreted via Feldman-Cousins confidence intervals as well. For $ A $ the upper uncertainty is not given, as it is found at the fit boundary. |
| Summary |
| We have presented a measurement of the charge asymmetry in WH production based on the full LHC Run-2 data set of proton-proton collisions at a center-of-mass energy of 13 TeV collected with the CMS Experiment in the years 2016--2018. The data set corresponds to an integrated luminosity of 138 fb$ ^{-1} $. Events are selected requiring two or three charged leptons, targeting $ \mathrm{H}\to\tau\tau $ decay channels, where the $ \tau\tau $ system decays into hadrons or a hadron and a light lepton and the associated W boson decays into a light lepton. The results are presented as separate production cross sections for $ \mathrm{W^+}\mathrm{H} $ and $ \mathrm{W^-}\mathrm{H} $, as well as a combined WH production cross section and the charge asymmetry $ A $. |
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