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| 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 $\sqrt{s}=$ 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 $\sqrt{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 $\mu$, defined as the ratio of the observed double-Higgs boson production rate in the $\mathrm{HH \rightarrow ZZ^{*}b\bar{b} \rightarrow 4\ell b\bar{b}}$ 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 $-9 (-10.5) < k_{\lambda} < 14 (15.5)$ at 95% CL. | ||
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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These preliminary results are superseded in this paper, Submitted to JHEP. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
$m(4\ell)$ (left) and $m(\mathrm{b\bar{b}})$ (right) distributions. The $m(\mathrm{b\bar{b}})$ plot is done considering only events in the mass window: 115 GeV $ < m(4\ell) < $ 135 GeV. |
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Figure 1-a:
$m(4\ell)$ distribution. |
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Figure 1-b:
$m(\mathrm{b\bar{b}})$ distribution. The plot is done considering only events in the mass window: 115 GeV $ < m(4\ell) < $ 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 (4$\mu $, 4e, and 2e2$\mu $) 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 $\mathcal {B}(\mathrm {HH}\rightarrow 4\ell b\bar{b})$ obtained for different values of $k_\lambda $. 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 $\mathcal {B}(\mathrm {HH}\rightarrow 4\ell b\bar{b})$ obtained for different values of $k_\lambda $. The green and yellow bands represent, respectively, the one and two standard deviation extensions around the expected limit. |
| Tables | |
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Table 1:
Expected yields in the 4$\ell $ 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 $\mathrm{b}\bar{\mathrm{b}}$ final state is presented. This search uses a data sample collected in proton-proton collisions at $\sqrt{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 $\mu$, defined as the observed double-H boson rate in the $4\ell\mathrm{b}\bar{\mathrm{b}}$ 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 $-9 (-10.5) < k_{\lambda} < 14 (15.5)$ at 95% CL. |
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Compact Muon Solenoid LHC, CERN |
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