Search for Higgs boson decay to a charm quark-antiquark pair in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Abstract

A search for the standard model Higgs boson decaying to a charm quark-antiquark pair, H $\to$ $\mathrm{c}\bar{\mathrm{c}}$, produced in association with a leptonically decaying V (W or Z) boson is presented. The search is performed with proton-proton collisions at $\sqrt{s}$ = 13 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 138 fb${}^{-1}$. Novel charm jet identification and analysis methods using machine learning techniques are employed. The analysis is validated by searching for Z $\to$ $\mathrm{c}\bar{\mathrm{c}}$ in VZ events, leading to its first observation at a hadron collider with a significance of 5.7 standard deviations. The observed (expected) upper limit on $\sigma$(VH)$\mathcal{B}$(H $\to$ $\mathrm{c}\bar{\mathrm{c}}$) is 0.94 (0.50 ${}_{-0.15}^{+0.22}$) pb at 95% confidence level (CL), corresponding to 14 (7.6 ${}_{-2.3}^{+3.4}$) times the standard model prediction. For the Higgs-charm Yukawa coupling modifier, ${\kappa }_{\mathrm{c}}$, the observed (expected) 95% CL interval is 1.1 $<$ $|{\kappa }_{\mathrm{C}}|$ $<$ 5.5 ($|{\kappa }_{\mathrm{c}}|$ $<$ 3.4), the most stringent constraint to date.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables, including additional supplementary figures and tables, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIG-21-008 (CMS Public Pages)

References in corpus (27)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• 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
• Combined Measurement of the Higgs Boson Mass in $pp$ Collisions at $\sqrt{s}=7$ and 8 TeV with the ATLAS and CMS Experiments
• Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions
• Jet substructure as a new Higgs search channel at the LHC
• Particle-flow reconstruction and global event description with the CMS detector
• The CMS trigger system
• Single-top Wt-channel production matched with parton showers using the POWHEG method
• Description and performance of track and primary-vertex reconstruction with the CMS tracker
• Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 TeV
• Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV
• Observation of the diphoton decay of the Higgs boson and measurement of its properties
• Pileup Per Particle Identification
• Study of the mass and spin-parity of the Higgs boson candidate via its decays to Z boson pairs
• Measurement of Higgs boson production in the diphoton decay channel in $pp$ collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector
• Performance of missing transverse momentum reconstruction in proton-proton collisions at $\sqrt{s}=$ 13 TeV using the CMS detector
• Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector
• Measurements of properties of the Higgs boson decaying into the four-lepton final state in pp collisions at sqrt(s) = 13 TeV
• Measurements of Higgs boson production and couplings in the four-lepton channel in $pp$ collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector
• vh@nnlo - Higgs Strahlung at hadron colliders
• Associated ZH production at hadron colliders: the fully differential NNLO QCD calculation
• NNLO QCD+NLO EW with MATRIX+OpenLoops: precise predictions for vector-boson pair production
• Direct constraint on the Higgs-charm coupling from a search for Higgs boson decays into charm quarks with the ATLAS detector
• A new calibration method for charm jet identification validated with proton-proton collision events at $\sqrt{s}$ = 13 TeV

Cited by in corpus (14)

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• Observation of WW$\gamma$ production and search for H$\gamma$ production in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Does Lorentz-symmetric design boost network performance in jet physics?
• Measurement of the production cross section for a W boson in association with a charm quark in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Accuracy versus precision in boosted top tagging with the ATLAS detector
• Performance of heavy-flavour jet identification in Lorentz-boosted topologies in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Simultaneous probe of the charm and bottom quark Yukawa couplings using $\mathrm{t}\bar{\mathrm{t}}$H events
• Search for rare decays of the Z and Higgs bosons to a J/$\psi$ or $\psi$(2S) meson and a photon in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• State-of-the-art cross sections for ttH: NNLO predictions matched with NNLL resummation and EW corrections
• Search for $\gamma$H production and constraints on the Yukawa couplings of light quarks to the Higgs boson
• Vision Transformers for End-to-End Quark-Gluon Jet Classification from Calorimeter Images