CMS-PAS-HIG-19-011

CMS-PAS-HIG-19-011
Measurement of the ttH and tH production rates in the H $\to\mathrm{b\overline{b}}$ decay channel with 138 fb $^{-1}$ of proton-proton collision data at $\sqrt{s}=$ 13 TeV
CMS Collaboration
22 August 2023

Abstract: An analysis of the production of a Higgs boson (H) in association with a top quark-antiquark pair (ttH) or a single top quark (tH) in the channel where the Higgs boson decays into a bottom quark-antiquark pair (H $\to\mathrm{b\overline{b}}$ ) is presented. The analysis utilises proton-proton collision data collected at the CERN LHC with the CMS experiment at $\sqrt{s}=$ 13 TeV between 2016 and 2018, which correspond to an integrated luminosity of 138 fb $^{-1}$ . All three decay channels of the $\mathrm{t\overline{t}}$ system are considered. Various signal interpretations are performed. The observed ttH production rate relative to the standard model (SM) expectation is 0.33 $\pm$ 0.26 $=$ 0.33 $\pm$ 0.17 (stat) $\pm$ 0.21 (syst). Additionally, the ttH production rate is determined in intervals of Higgs boson $p_{\mathrm{T}}$ . An upper limit at 95% confidence level on the tH production rate of 14.6 times the SM expectation is observed, with an expectation of 19.3 $^{+9.2}_{-6.0}$ . Finally, constraints are derived on the strength and structure of the coupling between the Higgs boson and the top quark from simultaneous extraction of the ttH and tH production rates.
Links: CDS record (PDF) ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to JHEP. The superseded preliminary plots can be found here.

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