CMS-PAS-HIG-20-004 | ||
Search for nonresonant Higgs boson pair production in the 4 leptons plus 2 b jets final state in proton-proton collisions at √s= 13 TeV | ||
CMS Collaboration | ||
July 2020 | ||
Abstract: A search for nonresonant pair-production of Higgs bosons (HH) with one Higgs boson decaying into four leptons and the other into a pair of b quarks is presented. The analyzed data correspond to an integrated luminosity of 137 fb−1 of proton-proton collisions at √s= 13 TeV collected with the CMS detector during the years 2016 to 2018. An upper limit of 30 at 95% confidence level (CL) is set on the signal strength modifier μ, defined as the ratio of the observed double-Higgs boson production rate in the HH→ZZ∗bˉb→4ℓbˉb decay channel to the standard model (SM) expectation. Possible modifications of the SM Higgs trilinear coupling are investigated and constrained to be within the observed (expected) range −9(−10.5)<kλ<14(15.5) at 95% CL. | ||
Links:
CDS record (PDF) ;
inSPIRE record ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to JHEP. The superseded preliminary plots can be found here. |
Figures | |
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Figure 1:
m(4ℓ) (left) and m(bˉb) (right) distributions. The m(bˉb) plot is done considering only events in the mass window: 115 GeV <m(4ℓ)< 135 GeV. |
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Figure 1-a:
m(4ℓ) distribution. |
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Figure 1-b:
m(bˉb) distribution. The plot is done considering only events in the mass window: 115 GeV <m(4ℓ)< 135 GeV. |
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Figure 2:
Inclusive BDT distributions for signal, estimated background components, and data for the three different leptonic final state (4μ, 4e, and 2e2μ) and data taking years. |
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Figure 3:
Left: upper limit on the signal strength at 95% CL for each year and for the combination. Right: Expected and observed 95% CL upper limits on the SM-like HH production cross section times B(HH→4ℓbˉb) obtained for different values of kλ. The green and yellow bands represent, respectively, the one and two standard deviation extensions around the expected limit. |
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Figure 3-a:
Upper limit on the signal strength at 95% CL for each year and for the combination. The green and yellow bands represent, respectively, the one and two standard deviation extensions around the expected limit. |
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Figure 3-b:
Expected and observed 95% CL upper limits on the SM-like HH production cross section times B(HH→4ℓbˉb) obtained for different values of kλ. The green and yellow bands represent, respectively, the one and two standard deviation extensions around the expected limit. |
Tables | |
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Table 1:
Expected yields in the 4ℓ signal region plus at least two jets after selection. Others contains contributions from TTW, WWZ, WZZ and ZZZ, processes. |
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Table 2:
Summary of experimental systematic uncertainties. The effect of b tagging SF, JEC and JES is propagate to the shape of the BDT distribution, thus those uncertainties are treated as shape uncertainties. |
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Table 3:
Summary of theory systematic uncertainties. |
Summary |
A search for nonresonant H boson pair production in the 4-lepton bˉb final state is presented. This search uses a data sample collected in proton-proton collisions at √s= 13 TeV by the CMS detector during the years 2016 to 2018 that corresponds to an integrated luminosity of 137 fb−1. The results are found to be compatible with the SM expectations, and an upper limit of 30 at the 95% CL is set on the signal strength modifier μ, defined as the observed double-H boson rate in the 4ℓbˉb channel divided by the Standard Model (SM) expectation. Possible modifications of the SM Higgs trilinear coupling are investigated and constrained to be within the observed (expected) range −9(−10.5)<kλ<14(15.5) at 95% CL. |
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Compact Muon Solenoid LHC, CERN |
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