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Title: Measurement of the Higgs boson production rate in association with top quarks in final states with electrons, muons, and hadronically decaying tau leptons at $$\sqrt{s} = 13\,\text {Te}\text {V}$$

Journal Article · · European Physical Journal. C, Particles and Fields
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The rate for Higgs (H) bosons production in association with either one (tH) or two ($$t\bar{t}H$$) top quarks is measured in final states containing multiple electrons, muons, or tau leptons decaying to hadrons and a neutrino, using proton–proton collisions recorded at a center-of-mass energy of 13TeV by the CMS experiment. The analyzed data correspond to an integrated luminosity of 137fb-1. The analysis is aimed at events that contain H→WW, H→ττ, or H→ZZ decays and each of the top quark(s) decays either to lepton+jets or all-jet channels. Sensitivity to signal is maximized by including ten signatures in the analysis, depending on the lepton multiplicity. The separation among tH, $$t\bar{t}H$$, and the backgrounds is enhanced through machine-learning techniques and matrix-element methods. The measured production rates for the $$t\bar{t}H$$ and tH signals correspond to 0.92 ± 0.19 (stat) $$^{+0.17}_{-0.13}$$ (syst) and 5.7 ± 2.7 (stat) ± 3.0 (syst) of their respective standard model (SM) expectations. The corresponding observed (expected) significance amounts to 4.7 (5.2) standard deviations for $$t\bar{t}H$$, and to 1.4 (0.3) for tH production. Assuming that the Higgs boson coupling to the tau lepton is equal in strength to its expectation in the SM, the coupling yt of the Higgs boson to the top quark divided by its SM expectation, κt=yt/ytSM, is constrained to be within -0.9<κt<-0.7 or 0.7<κt<1.1, at 95% confidence level. This result is the most sensitive measurement of the $$t\bar{t}H$$ production rate to date.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
CMS Collaboration
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1712755
Report Number(s):
FERMILAB-PUB-20-584-CMS; CMS-HIG-19-008; CERN-EP-2020-200; arXiv:2011.03652; oai:inspirehep.net:1828962; TRN: US2204693
Journal Information:
European Physical Journal. C, Particles and Fields, Vol. 81, Issue 4; ISSN 1434-6044
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC journal September 2012
The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations journal July 2014
Performance of missing transverse momentum reconstruction in proton-proton collisions at √ s = 13 TeV using the CMS detector journal July 2019
XGBoost: A Scalable Tree Boosting System conference January 2016
Exploring theory space with Monte Carlo reweighting journal October 2014
Search for the Standard Model Higgs boson decaying into b b ¯ $$ b\overline{b} $$ produced in association with top quarks decaying hadronically in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector journal May 2016
Efficient identification of boosted semileptonic top quarks at the LHC journal March 2011
Parton distributions from high-precision collider data: NNPDF Collaboration journal October 2017
Dynamical Likelihood Method for Reconstruction of Events with Missing Momentum. II. Mass Spectra for 2→2 Processes journal March 1991
Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector journal October 2015
Soft-gluon resummation for Higgs boson production at hadron colliders journal July 2003
Broken Symmetries and the Masses of Gauge Bosons journal October 1964
Broken Symmetry and the Mass of Gauge Vector Mesons journal August 1964
Search for the Standard Model Higgs boson produced in association with top quarks and decaying into $$\varvec{b\bar{b}}$$ b b ¯ in $$\varvec{pp}$$ p p collisions at $$\sqrt{\mathbf{s}}= \varvec{8{{\,\mathrm TeV}}}$$ s = 8 T e V with the ATLAS detector journal July 2015
Unbiased global determination of parton distributions and their uncertainties at NNLO and at LO journal February 2012
Incorporating Nuisance Parameters in Likelihoods for Multisource Spectra null January 2011
The catchment area of jets journal April 2008
Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at √ s = 8 TeV journal June 2015
A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms journal November 2004
Search for new physics in same-sign dilepton events in proton–proton collisions at $$\sqrt{s} = 13\,\text {TeV} $$ s = 13 TeV journal August 2016
PDF4LHC recommendations for LHC Run II journal January 2016
Extraction and validation of a new set of CMS pythia8 tunes from underlying-event measurements journal January 2020
Is the standard Higgs scalar elementary? journal April 1996
Top++: A program for the calculation of the top-pair cross-section at hadron colliders journal November 2014
Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV journal May 2018
An introduction to PYTHIA 8.2 journal June 2015
Search for t t ¯ H $$ \mathrm{t}\overline{\mathrm{t}}\mathrm{H} $$ production in the H → b b ¯ $$ \mathrm{H}\to \mathrm{b}\overline{\mathrm{b}} $$ decay channel with leptonic t t ¯ $$ \mathrm{t}\overline{\mathrm{t}} $$ decays in proton-proton collisions at s = 13 $$ \sqrt{s}=13 $$ TeV journal March 2019
Pileup subtraction using jet areas journal January 2008
Strong tW scattering at the LHC journal January 2016
Geant4—a simulation toolkit
  • Agostinelli, S.; Allison, J.; Amako, K.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 506, Issue 3 https://doi.org/10.1016/S0168-9002(03)01368-8
journal July 2003
Dynamical Likelihood Method for Reconstruction of Events with Missing Momentum. I. Method and Toy Models journal December 1988
The CMS trigger system journal January 2017
Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV journal February 2017
Fitting using finite Monte Carlo samples journal October 1993
Top quark seesaw theory of electroweak symmetry breaking journal March 1999
On the maximal use of Monte Carlo samples: re-weighting events at NLO accuracy text January 2016