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| CMS-PAS-HIG-21-012 | ||
| Inclusive search for a boosted Higgs boson and an observation of the Z boson decaying to charm quark pair in proton-proton collisions at $\sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| May 2022 | ||
| Abstract: A search for the standard model Higgs (H) boson produced with transverse momentum greater than 450 GeV and decaying to charm quark-antiquark pairs ($\mathrm{c\bar{c}}$) is performed using proton-proton collision data collected by the CMS experiment at the LHC at $\sqrt{s}=$ 13 TeV. The data sample corresponds to an integrated luminosity of 138 fb$^{-1}$. The search is inclusive in H production mode. Highly Lorentz-boosted H decaying to $\mathrm{c\bar{c}}$ are reconstructed as single large-radius jets, and are identified using a dedicated charm tagging technique based on a deep neural network. The method is validated with the $\mathrm{Z}\to \mathrm{c\bar{c}}$ decay process, which is observed for the first time in the Z+jets production mode at a hadron collider with a significance of well over 5 standard deviations and a signal strength of 0.91$_{-0.15}^{+0.18}$ (exp.) $\pm$ 0.7 (th.) $\pm$ 0.05 (stat.) relative to the standard model prediction. A 95% confidence level observed (expected) upper limit is set on the $\mathrm{H}\to \mathrm{c\bar{c}}$ signal strength of 45 (38) times the standard model prediction. | ||
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CDS record (PDF) ;
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These preliminary results are superseded in this paper, Submitted to PRL. The superseded preliminary plots can be found here. |
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| Figures | |
png pdf |
Figure 1:
DDCvL and DDCvB performance for ${\mathrm{H} \to \mathrm{c} \mathrm{\bar{c}}}$ identification versus QCD and ${\mathrm{H} \to \mathrm{b} \mathrm{\bar{b}}}$ processes respectively. No selection apart from the displayed $m_{SD}$ and ${p_{\mathrm {T}}}$ cuts is applied. AUC is the area under curve metric. |
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Figure 2:
The observed and fitted ${m_{\mathrm {SD}}}$ distributions for the passing (left) and failing (right) regions, combining all ${p_{\mathrm {T}}}$ categories, and three data taking years. The fit is performed under the signal-plus-background hypothesis with a single inclusive $\mathrm{H} (\mathrm{c} {}\mathrm{\bar{c}})$ signal strength parameter. The QCD yields and shapes and the ${\mathrm{t} {}\mathrm{\bar{t}}}$ yields are estimated from data. The dashed line represents the $\mathrm{H} \rightarrow \mathrm{c} {}\mathrm{\bar{c}} $ expectation, amplified by a factor of 200. The step-like features at 166 and 180 GeV occur due to excluded ${m_{\mathrm {SD}}}$ bins, outside of the $\rho $ acceptance region. The lower panel shows the residual difference between the model and data, scaled by the statistical uncertainty in the data, effectively showing an approximate significance. |
png pdf |
Figure 2-a:
The observed and fitted ${m_{\mathrm {SD}}}$ distributions for the passing region, combining all ${p_{\mathrm {T}}}$ categories, and three data taking years. The fit is performed under the signal-plus-background hypothesis with a single inclusive $\mathrm{H} (\mathrm{c} {}\mathrm{\bar{c}})$ signal strength parameter. The QCD yields and shapes and the ${\mathrm{t} {}\mathrm{\bar{t}}}$ yields are estimated from data. The dashed line represents the $\mathrm{H} \rightarrow \mathrm{c} {}\mathrm{\bar{c}} $ expectation, amplified by a factor of 200. The step-like features at 166 and 180 GeV occur due to excluded ${m_{\mathrm {SD}}}$ bins, outside of the $\rho $ acceptance region. The lower panel shows the residual difference between the model and data, scaled by the statistical uncertainty in the data, effectively showing an approximate significance. |
png pdf |
Figure 2-b:
The observed and fitted ${m_{\mathrm {SD}}}$ distributions for the failing region, combining all ${p_{\mathrm {T}}}$ categories, and three data taking years. The fit is performed under the signal-plus-background hypothesis with a single inclusive $\mathrm{H} (\mathrm{c} {}\mathrm{\bar{c}})$ signal strength parameter. The QCD yields and shapes and the ${\mathrm{t} {}\mathrm{\bar{t}}}$ yields are estimated from data. The dashed line represents the $\mathrm{H} \rightarrow \mathrm{c} {}\mathrm{\bar{c}} $ expectation, amplified by a factor of 200. The step-like features at 166 and 180 GeV occur due to excluded ${m_{\mathrm {SD}}}$ bins, outside of the $\rho $ acceptance region. The lower panel shows the residual difference between the model and data, scaled by the statistical uncertainty in the data, effectively showing an approximate significance. |
| Tables | |
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Table 1:
Summary of applied data-to-simulation scale factors for the jet mass scale, jet mass resolution, $ {N_{2}^{1\mathrm {,DDT}}} $ selection, and DDX selections for different data taking periods. Jet mass scale is given as an additive correction in units of GeV. |
png pdf |
Table 2:
Sources of uncertainty in the measurement of the signal strength $\mu _{\mathrm{H}}= $ 8.6${_{-19.4}^{+19.9}} $, and their observed impact ($\Delta \mu _{\mathrm{H}}$) in the fit to the full data set. The impact of each uncertainty is evaluated by computing the uncertainty excluding that source and subtracting it in quadrature from the total uncertainty. Correlations among the components may prevent the sum in quadrature of each source from matching the total uncertainty. |
| Summary |
| In conclusion, a search for standard model Z and H bosons produced with transverse momentum greater than 450 GeV and decaying to charm quark-antiquark pairs has been performed with an integrated luminosity of 138 fb$^{-1}$ at $\sqrt{s} = $ 13 TeV. The $\mathrm{Z}\to\mathrm{c\bar{c}}$ process is observed for the first time in the Z+jets production mode and boosted topology at a hadronic collider. An observed (expected) upper limit on the inclusive Higgs boson cross section times $\mathrm{c\bar{c}}$ decay branching ratio of 45 (38) times the standard model expectation is set at the 95% confidence level. |
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