Test of $CP$ Invariance in Higgs Boson Vector-Boson-Fusion Production Using the $H\to \gamma \gamma$ Channel with the ATLAS Detector

Abstract

A test of $CP$ invariance in Higgs boson production via vector-boson fusion has been performed in the $H\to \gamma \gamma$ channel using 139 fb${}^{-1}$ of proton-proton collision data at $\sqrt{s}=13\mathrm{TeV}$ collected by the ATLAS detector at the LHC. The Optimal Observable method is used to probe the $CP$ structure of interactions between the Higgs boson and electroweak gauge bosons, as described by an effective field theory. No sign of $CP$ violation is observed in data. Constraints are set on the parameters describing the strength of the $CP$-odd component in the coupling between the Higgs boson and the electroweak gauge bosons in two effective field theory bases: $\tilde{d}$ in the HISZ basis and $c_{H\tilde{W}}$ in the Warsaw basis. The results presented are the most stringent constraints on $CP$ violation in the coupling between Higgs and weak bosons. The 95% CL constraint on $\tilde{d}$ is derived for the first time and the 95% CL constraint on $c_{H\tilde{W}}$ has been improved by a factor of 5 compared to the previous measurement.

33 pages in total, author list starting page 16, 3 figures, 1 table. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2020-08/. This version corrects the title that was modified during the journal review

References in corpus (23)

• 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
• An NNLO subtraction formalism in hadron collisions and its application to Higgs boson production at the LHC
• Higgs boson gluon-fusion production in N3LO QCD
• NLO Electroweak Corrections to Higgs Boson Production at Hadron Colliders
• Electroweak and QCD corrections to Higgs production via vector-boson fusion at the LHC
• Strong and electroweak corrections to the production of Higgs+2jets via weak interactions at the LHC
• 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
• Jet energy scale and resolution measured in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Top mass effects in Higgs production at next-to-next-to-leading order QCD: virtual corrections
• Helicity Selection Rules and Non-Interference for BSM Amplitudes
• SMEFTsim 3.0 -- a practical guide
• $CP$ Properties of Higgs Boson Interactions with Top Quarks in the $t\bar{t}H$ and $tH$ Processes Using $H\to \gamma \gamma$ with the ATLAS Detector
• Higgs boson production cross-section measurements and their EFT interpretation in the $4\ell$ decay channel at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• Measurements of $\mathrm{t}\bar{\mathrm{t}}$H production and the CP structure of the Yukawa interaction between the Higgs boson and the top quark in the diphoton decay channel
• Constraints on anomalous Higgs boson couplings to vector bosons and fermions in its production and decay using the four-lepton final state
• Test of CP invariance in vector-boson fusion production of the Higgs boson in the $H\to \tau \tau$ channel in proton$-$proton collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• Optimisation of large-radius jet reconstruction for the ATLAS detector in 13 TeV proton-proton collisions
• Analysis of the CP structure of the Yukawa coupling between the Higgs boson and $\tau$ leptons in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Measurements of the Higgs boson inclusive and differential fiducial cross-sections in the diphoton decay channel with $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Constraints on Higgs boson properties using $W{W}^{\ast }(\to e\nu \mu \nu )jj$ production in 36.1 fb${}^{-1}$ of $\sqrt{s}$=13 TeV $pp$ collisions with the ATLAS detector

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• Combination of measurements of CP properties of Higgs boson interactions with vector bosons using proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Illuminating all-hadronic final states with a photon: Exotic decays of the Higgs boson to four bottom quarks in vector boson fusion plus gamma at hadron colliders