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

Abstract

This article presents the results of two studies of Higgs boson properties using the $W{W}^{\ast }(\to e\nu \mu \nu )jj$ final state, based on a dataset corresponding to 36.1/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$-$gluon fusion and constrains the CP properties of the effective Higgs$-$gluon interaction. Using angular distributions and the overall rate, a value of $\tan (\alpha )=0.0\pm 0.4$ stat. $\pm 0.3$ 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 $a_L=0.91_{-0.18}^{+0.10}$(stat.)${}_{-0.17}^{+0.09}$(syst.) and $a_T=1.2\pm 0.4$(stat.)${}_{-0.3}^{+0.2}$(syst.). These coupling strengths are translated into pseudo-observables, resulting in ${\kappa }_{VV}=0.91_{-0.18}^{+0.10}$(stat.)${}_{-0.17}^{+0.09}$(syst.) and ${\epsilon }_{VV}=0.13_{-0.20}^{+0.28}$ (stat.)${}_{-0.10}^{+0.08}$(syst.). All results are consistent with the Standard Model predictions.

arXiv comment47 pages in total, author list starting page 31, 9 figures, 11 tables, Eur. Phys. J. C 82 (2022) 622. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2017-13

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