Constraints on Higgs boson properties using WW(→eνμν)jj production in 36.1 fb−1 of √s = 13 TeV pp collisions with the ATLAS detector

ATLAS Collaboration, Paul Newman

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Abstract

This article presents the results of two studies of Higgs boson properties using the WW(→eνμν)jj final state, based on a dataset corresponding to 36.1 fb−1 of √s = 13 TeV proton-proton collisions recorded by the ATLAS experiment at the Large Hadron Collider. The first study targets Higgs boson production via gluon-gluon fusion and constrains the CP properties of the effective Higgs-gluon interaction. Using angular distributions and the overall rate, a value of tan(α)=0.0±0.4(stat.)±0.3(syst.) is obtained for the tangent of the mixing angle for CP-even and CP-odd contributions. The second study exploits the vector-boson fusion production mechanism to probe the Higgs boson couplings to longitudinally and transversely polarised W and Z bosons in both the production and the decay of the Higgs boson; these couplings have not been directly constrained previously. The polarisation-dependent coupling-strength scale factors are defined as the ratios of the measured polarisation-dependent coupling strengths to those predicted by the Standard Model, and are determined using rate and kinematic information to be aL=0.91+0.10−0.18(stat.)+0.09−0.17(syst.) and aT=1.2±0.4(stat.)+0.2−0.3(syst.). These coupling strengths are translated into pseudo-observables, resulting in κVV=0.91+0.10−0.18(stat.)+0.09−0.17(syst.) and ϵVV=0.13+0.28−0.20 (stat.)+0.08−0.10(syst.). All results are consistent with the Standard Model predictions.
Original languageEnglish
Article number622
Number of pages33
JournalEuropean Physical Journal C
Volume82
DOIs
Publication statusPublished - 18 Jul 2022

Bibliographical note

47 pages in total, author list starting page 31, 9 figures, 11 tables, submitted to EPJ C. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2017-13

Keywords

  • hep-ex

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