Constraints on Higgs boson properties using $WW^{*}(\rightarrow e\nu\mu\nu) jj$ production in 36.1 fb$^{-1}$ of $\sqrt{s}$=13 TeV $pp$ collisions with the ATLAS detector

The ATLAS collaboration
Eur.Phys.J.C 82 (2022) 622, 2022.

Abstract (data abstract)
CERN-LHC. This article presents the results of two studies of Higgs boson properties using the WW* -> e nu e mu jj final state, based on a dataset corresponding to 36/fb of $\sqrt(s)$ = 13 TeV proton--proton collisions recorded by the ATLAS experiment at the Large Hadron Collider. The first study targets Higgs boson production via gluon fusion and constrains the CP properties of the effective Higgs-gluon interaction. This study complements existing coupling parameter measurements in the e nu mu nu jj final state. Using both angular distributions and the overall rate, the mixing angle for CP-even and CP-odd contributions to the effective Higgs-gluon interaction is constrained to tan(alpha) = 0.0 $\pm$ 0.4 (stat) $\pm$ 0.3 (syst.). 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 previously constrained. The polarisation-dependent coupling-strength scale factors are defined as the ratios of the measured polarisation-dependent coupling strengths to that predicted by the Standard Model, and are constrained using rate and kinematic information to be a_(L)=0.91$^{+0.10}_{-0.18}$(stat.)$^{+0.09}_{-0.18}$(syst.) and a(T)=1.2 $\pm$ 0.4 (stat.)$^{+0.4}_{-0.3}$(syst.). These coupling strengths are translated into pseudo-observables, resulting in kappa(VV)= 0.90$^{+0.10}_{-0.18}$(stat.)$^{+0.09}_{-0.16}$(syst.) and epsilon(VV) = 0.13$^{+0.28}_{-0.20}$(stat.)$^{+0.08}_{-0.10}$(syst.). All results are consistent with the Standard Model predictions.

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