Test of CP Invariance in Higgs Boson Vector-Boson-Fusion Production Using the H→γγ Channel with the ATLAS Detector

• Published in: Physical review letters Vol. 131; no. 6; p. 061802
• Main Authors: Castro, Nuno Filipe, Onofre, A., ATLAS Collaboration
• Format: Journal Article
• Language: English
• Published: American Physical Society (APS) 2023; American Physical Society
• Subjects: Ciências Físicas; Ciências Naturais; Fysik; High Energy Physics - Experiment; Natural Sciences; Naturvetenskap; Physical Sciences; Physics; Subatomic Physics; Subatomär fysik; experimental results; invariance: CP; Higgs particle: radiative decay; Higgs particle: coupling; CERN LHC Coll; CP: violation; effective field theory; structure; ATLAS; data analysis method; photon: pair production; asymmetry: CP; p p: colliding beams; Higgs particle: hadroproduction; p p: scattering; 13000 GeV-cms; electroweak interaction; vector boson: fusion; gauge boson
• ISSN: 0031-9007; 1079-7114; 1079-7114
• DOI: 10.1103/PhysRevLett.131.061802

A test of C P invariance in Higgs boson production via vector-boson fusion has been performed in the H → γ γ channel using 139 fb - 1 of proton-proton collision data at s = 13 TeV collected by the ATLAS detector at the LHC. The optimal observable method is used to probe the C P structure of interactions between the Higgs boson and electroweak gauge bosons, as described by an effective field theory. No sign of C P violation is observed in the data. Constraints are set on the parameters describing the strength of the C P -odd component in the coupling between the Higgs boson and the electroweak gauge bosons in two effective field theory bases: d ˜ in the HISZ basis and c H W ˜ in the Warsaw basis. The results presented are the most stringent constraints on C P violation in the coupling between Higgs and weak bosons. The 95% C.L. constraint on d ˜ is derived for the first time and the 95% C.L. constraint on c H W ˜ has been improved by a factor of 5 compared to the previous measurement.
USDOE -U.S. Department of Energy(IN2P3-CNRS)