A combination of measurements of the CP properties of Higgs boson interactions with electroweak gauge bosons is presented, using 140  fb^{-1} of proton-proton collisions at sqrt[s]=13  TeV recorded by the ATLAS detector. Results from vector boson fusion H→ττ/WW^{*}/γγ, inclusive H→ZZ^{*}, and WH,H→bb[over ¯] channels are combined. No evidence of CP violation is observed, and constrains on the CP-violating operators in the Standard Model effective field theory framework (SMEFT) are set in the Warsaw basis. The results from the combination improve by over 40% on previous individual limits on c_{HW[over ˜]} and, for the first time, simultaneous constraints on three coefficients c_{HW[over ˜]}, c_{HB[over ˜]}, and c_{HW[over ˜]B} are set. These limits are the most stringent constraints to date on the relevant Wilson coefficients in the SMEFT framework with minimum model dependence.

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

Cobal M.;Giordani M. P.;Giugliarelli G.;Monzani S.;Panizzo G.;
2026-01-01

Abstract

A combination of measurements of the CP properties of Higgs boson interactions with electroweak gauge bosons is presented, using 140  fb^{-1} of proton-proton collisions at sqrt[s]=13  TeV recorded by the ATLAS detector. Results from vector boson fusion H→ττ/WW^{*}/γγ, inclusive H→ZZ^{*}, and WH,H→bb[over ¯] channels are combined. No evidence of CP violation is observed, and constrains on the CP-violating operators in the Standard Model effective field theory framework (SMEFT) are set in the Warsaw basis. The results from the combination improve by over 40% on previous individual limits on c_{HW[over ˜]} and, for the first time, simultaneous constraints on three coefficients c_{HW[over ˜]}, c_{HB[over ˜]}, and c_{HW[over ˜]B} are set. These limits are the most stringent constraints to date on the relevant Wilson coefficients in the SMEFT framework with minimum model dependence.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11390/1337887
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