Measurement of the $\mathrm{t}\bar{\mathrm{t}}$H and tH production rates in the H $\to$ $\mathrm{b}\bar{\mathrm{b}}$ decay channel using proton-proton collision data at $\sqrt{s}$ = 13 TeV

Abstract

An analysis of the production of a Higgs boson (H) in association with a top quark-antiquark pair ($\mathrm{t}\bar{\mathrm{t}}$H) or a single top quark (tH) is presented. The Higgs boson decay into a bottom quark-antiquark pair (H $\to$ $\mathrm{b}\bar{\mathrm{b}}$) is targeted, and three different final states of the top quark decays are considered, defined by the number of leptons (electrons or muons) in the event. The analysis utilises proton-proton collision data collected at the CERN LHC with the CMS experiment at $\sqrt{s}$ = 13 TeV in 2016-2018, which correspond to an integrated luminosity of 138 fb${}^{-1}$. The observed $\mathrm{t}\bar{\mathrm{t}}$H production rate relative to the standard model expectation is 0.33 $\pm$ 0.26 = 0.33 $\pm$ 0.17 (stat) $\pm$ 0.21 (syst). Additionally, the $\mathrm{t}\bar{\mathrm{t}}$H production rate is determined in intervals of Higgs boson transverse momentum. An upper limit at 95% confidence level is set on the tH production rate of 14.6 times the standard model prediction, with an expectation of 19.3 ${}_{-6.0}^{+9.2}$. 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 $\mathrm{t}\bar{\mathrm{t}}$H and tH production rates, and the results are combined with those obtained in other Higgs boson decay channels.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIG-19-011 (CMS Public Pages)

References in corpus (16)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions
• Tuning PYTHIA 8.1: the Monash 2013 Tune
• Vector boson pair production at the LHC
• Single-top Wt-channel production matched with parton showers using the POWHEG method
• Two-loop soft anomalous dimensions for single top quark associated production with a W- or H-
• -- HATHOR -- HAdronic Top and Heavy quarks crOss section calculatoR
• The Catchment Area of Jets
• HATHOR for single top-quark production: Updated predictions and uncertainty estimates for single top-quark production in hadronic collisions
• Higgs boson production in association with top quarks in the POWHEG BOX
• Higgs characterisation at NLO in QCD: CP properties of the top-quark Yukawa interaction
• tWH associated production at the LHC
• On the maximal use of Monte Carlo samples: re-weighting events at NLO accuracy
• Exploring Theory Space with Monte Carlo Reweighting

Cited by in corpus (3)

• Simultaneous probe of the charm and bottom quark Yukawa couplings using $\mathrm{t}\bar{\mathrm{t}}$H events
• State-of-the-art cross sections for ttH: NNLO predictions matched with NNLL resummation and EW corrections
• Transformer Neural Networks in the Measurement of $t\bar{t}H$ Production in the $H\to b\bar{b}$ Decay Channel with ATLAS