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| CMS-PAS-HIG-21-017 | ||
| Measurement of the highly Lorentz-boosted Higgs boson cross section in the decay mode of a pair of $ \tau $ leptons in proton-proton collisions at $ \sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| 21 August 2023 | ||
| Abstract: A measurement of the highly Lorentz-boosted Higgs boson cross section is presented, where the Higgs boson decays to a pair of $ \tau $ leptons and its transverse momentum is greater than 250 GeV. It is based on proton-proton collision data collected by the CMS experiment at the CERN LHC at a center-of-mass energy of 13 TeV. The data sample corresponds to an integrated luminosity of 138 fb$ ^{-1} $. The $ \tau $ leptons are required to be spatially close, and a dedicated algorithm is used to reconstruct and identify them. The product of the production cross section and branching fraction is measured to be 1.64 $ ^{+0.68}_{-0.54} $ times the standard model expectation, which corresponds to an observed (expected) significance of 3.5 (2.2) standard deviations. The fiducial differential cross section of the Higgs boson is also measured as a function of the Higgs boson and leading jet transverse momenta. | ||
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These preliminary results are superseded in this paper, Submitted to PLB. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
Observed and expected NN distributions in the signal region, after combining all four $ p_{\mathrm{T}}^{\mathrm{H}} $ bins, in the $ \mu\tau_\mathrm{h} $ (top left), $ \mathrm{e}\tau_\mathrm{h} $ (top right), $ \mathrm{e}\mu $ (bottom left), and $ \tau_\mathrm{h}\tau_\mathrm{h} $ (bottom right) channels. The combined signal and background distributions are the result of a binned maximum likelihood fit with the signal + background hypothesis, including all individual $ p_{\mathrm{T}} $ bins and data-taking years. |
png pdf |
Figure 1-a:
Observed and expected NN distributions in the signal region, after combining all four $ p_{\mathrm{T}}^{\mathrm{H}} $ bins, in the $ \mu\tau_\mathrm{h} $ (top left), $ \mathrm{e}\tau_\mathrm{h} $ (top right), $ \mathrm{e}\mu $ (bottom left), and $ \tau_\mathrm{h}\tau_\mathrm{h} $ (bottom right) channels. The combined signal and background distributions are the result of a binned maximum likelihood fit with the signal + background hypothesis, including all individual $ p_{\mathrm{T}} $ bins and data-taking years. |
png pdf |
Figure 1-b:
Observed and expected NN distributions in the signal region, after combining all four $ p_{\mathrm{T}}^{\mathrm{H}} $ bins, in the $ \mu\tau_\mathrm{h} $ (top left), $ \mathrm{e}\tau_\mathrm{h} $ (top right), $ \mathrm{e}\mu $ (bottom left), and $ \tau_\mathrm{h}\tau_\mathrm{h} $ (bottom right) channels. The combined signal and background distributions are the result of a binned maximum likelihood fit with the signal + background hypothesis, including all individual $ p_{\mathrm{T}} $ bins and data-taking years. |
png pdf |
Figure 1-c:
Observed and expected NN distributions in the signal region, after combining all four $ p_{\mathrm{T}}^{\mathrm{H}} $ bins, in the $ \mu\tau_\mathrm{h} $ (top left), $ \mathrm{e}\tau_\mathrm{h} $ (top right), $ \mathrm{e}\mu $ (bottom left), and $ \tau_\mathrm{h}\tau_\mathrm{h} $ (bottom right) channels. The combined signal and background distributions are the result of a binned maximum likelihood fit with the signal + background hypothesis, including all individual $ p_{\mathrm{T}} $ bins and data-taking years. |
png pdf |
Figure 1-d:
Observed and expected NN distributions in the signal region, after combining all four $ p_{\mathrm{T}}^{\mathrm{H}} $ bins, in the $ \mu\tau_\mathrm{h} $ (top left), $ \mathrm{e}\tau_\mathrm{h} $ (top right), $ \mathrm{e}\mu $ (bottom left), and $ \tau_\mathrm{h}\tau_\mathrm{h} $ (bottom right) channels. The combined signal and background distributions are the result of a binned maximum likelihood fit with the signal + background hypothesis, including all individual $ p_{\mathrm{T}} $ bins and data-taking years. |
png pdf |
Figure 2:
Observed and expected differential fiducial cross sections in bins of $ p_{\mathrm{T}}^{\mathrm{H}} $ (left) and $ p_{\mathrm{T}}^{\mathrm{j}_1} $ (right). The last bins include the overflow. The uncertainty bands in the theoretical predictions include uncertainties from the following sources: PDF, renormalization and factorization scales, underlying event and parton showering, and $ \mathcal{B}(\mathrm{H}\to\tau\tau) $. |
png pdf |
Figure 2-a:
Observed and expected differential fiducial cross sections in bins of $ p_{\mathrm{T}}^{\mathrm{H}} $ (left) and $ p_{\mathrm{T}}^{\mathrm{j}_1} $ (right). The last bins include the overflow. The uncertainty bands in the theoretical predictions include uncertainties from the following sources: PDF, renormalization and factorization scales, underlying event and parton showering, and $ \mathcal{B}(\mathrm{H}\to\tau\tau) $. |
png pdf |
Figure 2-b:
Observed and expected differential fiducial cross sections in bins of $ p_{\mathrm{T}}^{\mathrm{H}} $ (left) and $ p_{\mathrm{T}}^{\mathrm{j}_1} $ (right). The last bins include the overflow. The uncertainty bands in the theoretical predictions include uncertainties from the following sources: PDF, renormalization and factorization scales, underlying event and parton showering, and $ \mathcal{B}(\mathrm{H}\to\tau\tau) $. |
| Summary |
| In summary, the first measurement of the cross section of highly Lorentz-boosted standard model Higgs boson decaying to a pair of $ \tau $ leptons has been performed using 138 fb$ ^{-1} $ of proton-proton collision data collected by the CMS experiment at a center-of-mass energy of 13 TeV. A dedicated reconstruction algorithm has been used to resolve the overlap of constituents from the two close-by $ \tau $ leptons. The highly Lorentz-boosted $ \mathrm{H}\to\tau\tau $ signal with $ p_{\mathrm{T}}^{\mathrm{H}}\gtrsim $ 250 GeV is established with a significance of 3.5 standard deviations (2.2 expected). The best fit of the product of the observed $ \mathrm{H}\to\tau\tau $ signal production cross section and branching fraction is 1.64 $ ^{+0.68}_{-0.54} $ times the standard model expectation. The fiducial inclusive cross section has been measured to be 1.96 $ ^{+0.86}_{-0.69} $ fb which is consistent with the SM prediction of 1.20 $ \pm $ 0.20 fb. |
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Compact Muon Solenoid LHC, CERN |
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