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| CMS-PAS-HIG-21-020 | ||
| Search for boosted Higgs bosons produced via vector boson fusion in the H $\rightarrow b\bar{b} $ decay mode using LHC proton-proton collision data at $ \sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| 2 August 2023 | ||
| Abstract: A search is conducted for Higgs bosons produced with high transverse momentum ($ p_{\mathrm{T}} > $ 450 GeV) via vector boson fusion at the LHC proton-proton collider operating at center of mass energy $ \sqrt{s}= $ 13 TeV. The result is based on the 138 fb$ ^{-1} $ data set collected by the CMS detector in 2016, 2017, and 2018. The decay of a high-$ p_{\mathrm{T}} $ Higgs boson to a boosted bottom quark-antiquark pair is isolated by selecting large-radius jets and exploiting jet substructure and heavy flavour taggers based on advanced machine learning techniques. Independent regions targeting vector boson fusion and gluon-gluon fusion are defined based on the topology of forward quark jets. The signal strengths for both processes are extracted simultaneously by performing a maximum likelihood fit to data in the large-radius jet mass distribution. The observed signal strengths are 2.1$ ^{+1.9}_{-1.7} $ and 5.0$ ^{+2.1}_{-1.8} $ for gluon-gluon fusion and vector boson fusion, respectively. | ||
| Links: CDS record (PDF) ; Physics Briefing ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Lowest order Feynman diagrams of the Higgs boson production modes with highest cross section in 13 TeV proton-proton collisions: gluon-gluon fusion (left) and vector boson fusion (right). |
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Figure 2:
Soft drop mass distribution in simulated QCD events after applying DEEPDOUBLEBVL-V2 selection at different working points. The distributions are obtained from Gaussian kernel density estimation and normalized to unit area. The effect of the tagger selection on the shape is quantified with the Jensen-Shannon divergence $ D_{JS} $ [61]. The lower panel shows the absolute difference from the inclusive distribution. |
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Figure 3:
MC prediction of the relative contribution of each production mode to the total Higgs signal yield in the ggF and VBF categories. The DDB passing and failing regions are shown separately. |
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Figure 4:
Data and fitted soft drop mass distribution in the VBF category, summed over all $ m_{\mathrm{jj}} $ bins and data-taking periods. The DDB failing (left) and passing (right) regions are shown. The ggF and VBF signals are scaled to the fitted event yields. |
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Figure 4-a:
Data and fitted soft drop mass distribution in the VBF category, summed over all $ m_{\mathrm{jj}} $ bins and data-taking periods. The DDB failing (left) and passing (right) regions are shown. The ggF and VBF signals are scaled to the fitted event yields. |
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Figure 4-b:
Data and fitted soft drop mass distribution in the VBF category, summed over all $ m_{\mathrm{jj}} $ bins and data-taking periods. The DDB failing (left) and passing (right) regions are shown. The ggF and VBF signals are scaled to the fitted event yields. |
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Figure 5:
Data and fitted soft drop mass distribution in the ggF category, summed over all $ p_{\mathrm{T}} $ bins and data-taking periods. The DDB failing (left) and passing (right) regions are shown. The ggF and VBF signals are scaled to the fitted event yields. The apparent discontinuity at high mass is due to the exclusion of bins with extreme values of $ \rho $. |
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Figure 5-a:
Data and fitted soft drop mass distribution in the ggF category, summed over all $ p_{\mathrm{T}} $ bins and data-taking periods. The DDB failing (left) and passing (right) regions are shown. The ggF and VBF signals are scaled to the fitted event yields. The apparent discontinuity at high mass is due to the exclusion of bins with extreme values of $ \rho $. |
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Figure 5-b:
Data and fitted soft drop mass distribution in the ggF category, summed over all $ p_{\mathrm{T}} $ bins and data-taking periods. The DDB failing (left) and passing (right) regions are shown. The ggF and VBF signals are scaled to the fitted event yields. The apparent discontinuity at high mass is due to the exclusion of bins with extreme values of $ \rho $. |
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Figure 6:
Two-dimensional likelihood contour of the ggF and VBF signal strengths. The color scale represents twice the negative log likelihood difference with respect to the best fit point. The observed 95% (dashed) and 68% (solid) contours are shown in white, and the best fit point as a white cross. The SM expectation is marked by a red star. |
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Figure 7:
Data and fitted soft drop mass distribution in each of the two $ m_{\mathrm{jj}} $ bins in the VBF category, summed over all data-taking periods. The DDB passing region is shown. The ggF and VBF signals are scaled to the fitted event yields. |
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Figure 7-a:
Data and fitted soft drop mass distribution in each of the two $ m_{\mathrm{jj}} $ bins in the VBF category, summed over all data-taking periods. The DDB passing region is shown. The ggF and VBF signals are scaled to the fitted event yields. |
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Figure 7-b:
Data and fitted soft drop mass distribution in each of the two $ m_{\mathrm{jj}} $ bins in the VBF category, summed over all data-taking periods. The DDB passing region is shown. The ggF and VBF signals are scaled to the fitted event yields. |
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Figure 8:
Data and fitted soft drop mass distribution in each of the $ {p_{\mathrm{T}}} $ bins in the ggF category, summed over all data-taking periods. The DDB passing region is shown. The ggF and VBF signals are scaled to the fitted event yields. |
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Figure 8-a:
Data and fitted soft drop mass distribution in each of the $ {p_{\mathrm{T}}} $ bins in the ggF category, summed over all data-taking periods. The DDB passing region is shown. The ggF and VBF signals are scaled to the fitted event yields. |
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Figure 8-b:
Data and fitted soft drop mass distribution in each of the $ {p_{\mathrm{T}}} $ bins in the ggF category, summed over all data-taking periods. The DDB passing region is shown. The ggF and VBF signals are scaled to the fitted event yields. |
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Figure 8-c:
Data and fitted soft drop mass distribution in each of the $ {p_{\mathrm{T}}} $ bins in the ggF category, summed over all data-taking periods. The DDB passing region is shown. The ggF and VBF signals are scaled to the fitted event yields. |
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Figure 8-d:
Data and fitted soft drop mass distribution in each of the $ {p_{\mathrm{T}}} $ bins in the ggF category, summed over all data-taking periods. The DDB passing region is shown. The ggF and VBF signals are scaled to the fitted event yields. |
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Figure 8-e:
Data and fitted soft drop mass distribution in each of the $ {p_{\mathrm{T}}} $ bins in the ggF category, summed over all data-taking periods. The DDB passing region is shown. The ggF and VBF signals are scaled to the fitted event yields. |
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Figure 8-f:
Data and fitted soft drop mass distribution in each of the $ {p_{\mathrm{T}}} $ bins in the ggF category, summed over all data-taking periods. The DDB passing region is shown. The ggF and VBF signals are scaled to the fitted event yields. |
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Figure 9:
Top: the ggF signal strength is shown in black fitted per $ p_{\mathrm{T}} $ bin, with the ratio of ggF/VBF fixed to the SM expectation. The combined ggF signal strength and uncertainty is shown in blue. The SM expectation is shown as a dashed line. Bottom: the VBF signal strength is shown in black fitted per $ m_{\mathrm{jj}} $ bin, with the ratio of ggF/VBF fixed to the SM expectation. The combined VBF signal strength and uncertainty is shown in blue. The SM expectation is shown as a dashed line. |
| Tables | |
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Table 1:
Summary of data-to-simulation corrections for the jet mass scale, jet mass resolution, and jet substructure selection for different data taking periods. |
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Table 2:
Fitted signal strength for H $\to\mathrm{b}\overline{\mathrm{b}} $ in the ggF and VBF channels for each year of data taking and for the full data set. Data from 2016 is split into an early and late period due to mid-year changes in the detector configuration. |
| Summary |
| A search has been conducted for boosted Higgs bosons produced in the gluon-gluon fusion (ggF) and vector boson fusion (VBF) production modes. This search goes beyond the inclusive H $\to\mathrm{b}\overline{\mathrm{b}} $ measurements performed thus far to provide the first exploration of Higgs bosons produced with high transverse momentum ($ p_{\mathrm{T}} > $ 450 GeV) in the VBF channel. The signal strengths of the VBF and ggF processes are extracted simultaneously, and two-dimensional contours are determined. The observed signal strengths for the VBF and ggF processes are 5.0$ ^{+2.1}_{-1.8} $ and 2.1$ ^{+1.9}_{-1.7} $, corresponding respectively to observed (expected) significances of 3.0$ \sigma $ (0.9$ \sigma $) and 1.2$ \sigma $ (0.9$ \sigma $). The results are also presented as differential distributions in $ p_{\mathrm{T}} $ for ggF and in the invariant mass of the forward quark jets for VBF. Because measurements of the Higgs boson at high $ p_{\mathrm{T}} $ are particularly sensitive to physics beyond the standard model, these results provide an important step forward in the exploration of the Higgs boson and its interactions. |
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