CMS-PAS-HIG-21-017 | ||
Measurement of the highly Lorentz-boosted Higgs boson cross section in the decay mode of a pair of τ leptons in proton-proton collisions at √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 τ 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 τ 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These preliminary results are superseded in this paper, Submitted to PLB. The superseded preliminary plots can be found here. |
Figures | |
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Figure 1:
Observed and expected NN distributions in the signal region, after combining all four pHT bins, in the μτh (top left), eτh (top right), eμ (bottom left), and τhτh (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 pT bins and data-taking years. |
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Figure 1-a:
Observed and expected NN distributions in the signal region, after combining all four pHT bins, in the μτh (top left), eτh (top right), eμ (bottom left), and τhτh (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 pT bins and data-taking years. |
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Figure 1-b:
Observed and expected NN distributions in the signal region, after combining all four pHT bins, in the μτh (top left), eτh (top right), eμ (bottom left), and τhτh (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 pT bins and data-taking years. |
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Figure 1-c:
Observed and expected NN distributions in the signal region, after combining all four pHT bins, in the μτh (top left), eτh (top right), eμ (bottom left), and τhτh (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 pT bins and data-taking years. |
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Figure 1-d:
Observed and expected NN distributions in the signal region, after combining all four pHT bins, in the μτh (top left), eτh (top right), eμ (bottom left), and τhτh (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 pT bins and data-taking years. |
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Figure 2:
Observed and expected differential fiducial cross sections in bins of pHT (left) and pj1T (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 B(H→ττ). |
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Figure 2-a:
Observed and expected differential fiducial cross sections in bins of pHT (left) and pj1T (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 B(H→ττ). |
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Figure 2-b:
Observed and expected differential fiducial cross sections in bins of pHT (left) and pj1T (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 B(H→ττ). |
Summary |
In summary, the first measurement of the cross section of highly Lorentz-boosted standard model Higgs boson decaying to a pair of τ 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 τ leptons. The highly Lorentz-boosted H→ττ signal with pHT≳ 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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