An analysis of the production of a Higgs boson (H) in association with a top quark-antiquark pair (t ̄tH) or a single top quark (tH) is presented. The Higgs boson decay into a bottom quark-antiquark pair (H → bb ̄) 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 s = 13 TeV in 2016–2018, which correspond to an integrated luminosity of 138fb−1. The observed t ̄tH production rate relative to the standard model expectation is 0.33 ± 0.26 = 0.33 ± 0.17(stat) ± 0.21(syst). Additionally, the t ̄tH 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+9.2. Finally, constraints are derived on the strength −6.0 and structure of the coupling between the Higgs boson and the top quark from simultaneous extraction of the t ̄tH and tH production rates, and the results are combined with those obtained in other Higgs boson decay channels.

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

Alexe, C.;Bruschini, D.;
2025

Abstract

An analysis of the production of a Higgs boson (H) in association with a top quark-antiquark pair (t ̄tH) or a single top quark (tH) is presented. The Higgs boson decay into a bottom quark-antiquark pair (H → bb ̄) 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 s = 13 TeV in 2016–2018, which correspond to an integrated luminosity of 138fb−1. The observed t ̄tH production rate relative to the standard model expectation is 0.33 ± 0.26 = 0.33 ± 0.17(stat) ± 0.21(syst). Additionally, the t ̄tH 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+9.2. Finally, constraints are derived on the strength −6.0 and structure of the coupling between the Higgs boson and the top quark from simultaneous extraction of the t ̄tH and tH production rates, and the results are combined with those obtained in other Higgs boson decay channels.
2025
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
Hadron-Hadron Scattering, Higgs Physics, Top Physics
   Advanced Multi-Variate Analysis for New Physics Searches at the LHC
   AMVA4NewPhysics
   European Commission
   Horizon 2020 Framework Programme
   675440

   Search for Higgs bosons decaying to charm quarks
   HIGCC
   European Commission
   Horizon 2020 Framework Programme
   724704

   Direct and indirect searches for new physics in events with top quarks using LHC proton-proton collisions at the CMS detector
   LHCTOPVLQ
   European Commission
   Horizon 2020 Framework Programme
   752730

   Majorana neutrino discovery strategy with CMS
   MajorNet
   European Commission
   Horizon 2020 Framework Programme
   758316

   International Training Network for Statistics in High Energy Physics and Society
   INSIGHTS
   European Commission
   Horizon 2020 Framework Programme
   765710

   The strong interaction at the frontier of knowledge: fundamental research and applications
   STRONG-2020
   European Commission
   Horizon 2020 Framework Programme
   824093

   INnovative TRiggEr techniques for beyond the standard model PhysIcs Discovery at the LHC
   INTREPID
   European Commission
   Horizon Europe Framework Programme
   101115353

   Fundamental properties and time-scan of QCD matter at high densities and temperature exposed by jet substructure in heavy ion collisions with CMS experiment at the LHC
   QCDHighDensityCMS
   European Commission
   Horizon 2020 Framework Programme
   101002207
  
     https://doi.org/10.1007/JHEP02(2025)097
     https://dx.doi.org/10.1007/JHEP02(2025)097
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/154910
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