Direct constraint on the Higgs-charm coupling from a search for Higgs boson decays into charm quarks with the ATLAS detector

Abstract

A search for the Higgs boson decaying into a pair of charm quarks is presented. The analysis uses proton-proton collisions to target the production of a Higgs boson in association with a leptonically decaying $W$ or $Z$ boson. The dataset delivered by the LHC at a centre-of-mass energy of $\sqrt{s}=13$ TeV and recorded by the ATLAS detector corresponds to an integrated luminosity of 139 fb${}^{-1}$. Flavour-tagging algorithms are used to identify jets originating from the hadronisation of charm quarks. The analysis method is validated with the simultaneous measurement of $WW,WZ$ and $ZZ$ production, with observed (expected) significances of $2.6$ ($2.2$) standard deviations above the background-only prediction for the $(W/Z)Z(\to c\bar{c})$ process and $3.8$ ($4.6$) standard deviations for the $(W/Z)W(\to cq)$ process. The $(W/Z)H(\to c\bar{c})$ search yields an observed (expected) upper limit of $26$ ($31$) times the predicted Standard Model cross-section times branching fraction for a Higgs boson with a mass of 125 GeV, corresponding to an observed (expected) constraint on the charm Yukawa coupling modifier $|{\kappa }_c|<8.5(12.4)$, at the 95% confidence level. A combination with the ATLAS $(W/Z)H,H\to b\bar{b}$ analysis is performed, allowing the ratio ${\kappa }_c/{\kappa }_b$ to be constrained to less than 4.5 at the 95% confidence level, smaller than the ratio of the $b$- and $c$-quark masses, and therefore determines the Higgs-charm coupling to be weaker than the Higgs-bottom coupling at the 95% confidence level.

arXiv comment58 pages in total, author list starting page 43, 17 figures, 5 tables, published in EPJC. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2021-12

References in corpus (91)

• 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
• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• A Brief Introduction to PYTHIA 8.1
• FastJet user manual
• Asymptotic formulae for likelihood-based tests of new physics
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• Parton distributions for the LHC Run II
• Event generation with SHERPA 1.1
• Parton distributions with LHC data
• The ATLAS Simulation Infrastructure
• HDECAY: a Program for Higgs Boson Decays in the Standard Model and its Supersymmetric Extension
• The total top quark pair production cross-section at hadron colliders through O(alpha_S^4)
• Scattering Amplitudes with Open Loops
• Top++: a program for the calculation of the top-pair cross-section at hadron colliders
• Herwig 7.0 / Herwig++ 3.0 Release Note
• A Positive-Weight Next-to-Leading-Order Monte Carlo for Heavy Flavour Hadroproduction
• Jet substructure as a new Higgs search channel at the LHC
• High-precision QCD at hadron colliders: electroweak gauge boson rapidity distributions at NNLO
• 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-
• QCD matrix elements and truncated showers
• -- HATHOR -- HAdronic Top and Heavy quarks crOss section calculatoR
• Single-top hadroproduction in association with a W boson
• Percent level precision physics at the Tevatron: first genuine NNLO QCD corrections to q qbar -> t tbar + X
• Top-pair production at hadron colliders with next-to-next-to-leading logarithmic soft-gluon resummation
• NNLO corrections to top-pair production at hadron colliders: the all-fermionic scattering channels
• NLO single-top production matched with shower in POWHEG: s- and t-channel contributions
• NNLO corrections to top pair production at hadron colliders: the quark-gluon reaction
• Topological cell clustering in the ATLAS calorimeters and its performance in LHC Run 1
• Performance of pile-up mitigation techniques for jets in $pp$ collisions at $\sqrt{s}=8$ TeV using the ATLAS detector
• Electron and photon performance measurements with the ATLAS detector using the 2015-2017 LHC proton-proton collision data
• NNLO QCD corrections to the Higgs-strahlung processes at hadron colliders
• Hadronic top-quark pair production with NNLL threshold resummation
• Measurement of the $Z/{\gamma }^{\ast }$ boson transverse momentum distribution in $pp$ collisions at $\sqrt{s}$ = 7 TeV with the ATLAS detector
• ATLAS $b$-jet identification performance and efficiency measurement with $t\bar{t}$ events in $pp$ collisions at $\sqrt{s}=13$ TeV
• Jet energy scale measurements and their systematic uncertainties in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• HATHOR for single top-quark production: Updated predictions and uncertainty estimates for single top-quark production in hadronic collisions
• Performance of electron and photon triggers in ATLAS during LHC Run 2
• Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector
• Muon reconstruction and identification efficiency in ATLAS using the full Run 2 $pp$ collision data set at $\sqrt{s}=13$ TeV
• Automated One-Loop Calculations with GoSam
• Electroweak Radiative Corrections to Associated WH and ZH Production at Hadron Colliders
• Observation of Higgs boson decay to bottom quarks
• ATLAS data quality operations and performance for 2015-2018 data-taking
• Performance of missing transverse momentum reconstruction with the ATLAS detector using proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Performance of the ATLAS muon triggers in Run 2
• Handbook of LHC Higgs Cross Sections: 2. Differential Distributions
• MINLO: Multi-scale improved NLO
• Observation of $H\to b\bar{b}$ decays and $VH$ production with the ATLAS detector
• Observation of $\mathrm{t}\overline{\mathrm{t}}$H production
• Observation of the Higgs boson decay to a pair of tau leptons with the CMS detector
• HW/HZ + 0 and 1 jet at NLO with the POWHEG BOX interfaced to GoSam and their merging within MiNLO
• vh@nnlo - Higgs Strahlung at hadron colliders
• Top-Quark Mediated Effects in Hadronic Higgs-Strahlung
• Gluon-induced Higgs-strahlung at next-to-leading order QCD
• Search for the $b\bar{b}$ decay of the Standard Model Higgs boson in associated $(W/Z)H$ production with the ATLAS detector
• HAWK 2.0: A Monte Carlo program for Higgs production in vector-boson fusion and Higgs strahlung at hadron colliders
• Higgs boson decays to quarkonia and the Hccbar coupling
• Evidence for Higgs boson decay to a pair of muons
• Handbook of LHC Higgs Cross Sections: 3. Higgs Properties
• Performance of the ATLAS Track Reconstruction Algorithms in Dense Environments in LHC Run 2
• Operation of the ATLAS trigger system in Run 2
• A search for the dimuon decay of the Standard Model Higgs boson with the ATLAS detector
• Soft gluon resummation for gluon-induced Higgs Strahlung
• Cross-section measurements of the Higgs boson decaying into a pair of tau-leptons in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• An Exclusive Window onto Higgs Yukawa Couplings
• Up-, down-, strange-, charm-, and bottom-quark masses from four-flavor lattice QCD
• Measurements of $WH$ and $ZH$ production in the $H\to b\bar{b}$ decay channel in $pp$ collisions at 13 TeV with the ATLAS detector
• Search for a standard model-like Higgs boson in the mu+ mu- and e+ e- decay channels at the LHC
• Isolating Wt production at the LHC
• Constraining the Charm Yukawa and Higgs-quark Coupling Universality
• Performance of the missing transverse momentum triggers for the ATLAS detector during Run-2 data taking
• Reconstruction of hadronic decay products of tau leptons with the ATLAS experiment
• Search for the Decay of the Higgs Boson to Charm Quarks with the ATLAS Experiment
• Search for the Higgs boson decays $H\to ee$ and $H\to e\mu$ in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Charming the Higgs
• Measurements of the Higgs boson inclusive and differential fiducial cross sections in the 4$\ell$ decay channel at $\sqrt{s}$ = 13 TeV
• A search for the standard model Higgs boson decaying to charm quarks
• Is the Higgs Mechanism of Fermion Mass Generation a Fact? A Yukawa-less First-Two-Generation Model
• Higgs bosons with large couplings to light quarks
• Searches for exclusive Higgs and $Z$ boson decays into $J/\psi \gamma$, $\psi (2S)\gamma$, and ${\rm Y}(nS)\gamma$ at $\sqrt{s}=13$ TeV with the ATLAS detector
• Aligned and Spontaneous Flavor Violation
• What if the Masses of the First Two Quark Families are not Generated by the Standard Higgs?
• Search for exclusive Higgs and $Z$ boson decays to $\varphi \gamma$ and $\rho \gamma$ with the ATLAS detector
• Search for rare decays of Z and Higgs bosons to J$/\psi$ and a photon in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• A universally enhanced light-quarks Yukawa couplings paradigm
• Search for decays of the 125 GeV Higgs boson into a Z boson and a $\rho$ or $\varphi$ meson

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• Machine Learning in High Energy Physics: A review of heavy-flavor jet tagging at the LHC
• Jet-Origin Identification and Its Application at an Electron-Positron Higgs Factory
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• Search for exclusive Higgs and $Z$ boson decays to $\omega \gamma$ and Higgs boson decays to $K^{\ast }\gamma$ with the ATLAS detector
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• A continuous calibration of the ATLAS flavour-tagging classifiers via optimal transportation maps
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• Searches for exclusive Higgs boson decays into $D^{\ast }\gamma$ and $Z$ boson decays into $D^0\gamma$ and $K_s^0\gamma$ in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for the Higgs boson decays to a ${\rho }^0$, $\varphi$, or K${}^{\ast 0}$ meson and a photon in proton-proton collisions at $\sqrt{s}$ = 13 TeV
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