ATLAS Collaboration (Including: Becker, K., Facini, Gabriel, Harrison, P. F., Jones, E., Martin, T. A., McNicol, Christopher John, Morgenstern, S., Murray, W., Pollard, C. S. and Spangenberg, Martin). (2022) Constraints on Higgs boson properties using WW∗(→eνμν)jj production in 36.1fb−1 of s√=13 TeV pp collisions with the ATLAS detector. The European Physical Journal C, 82 . 622. doi:10.1140/epjc/s10052-022-10366-1 ISSN 1434-6044.

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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 36.1fb−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.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Higgs bosons, Proton-proton interactions, Large Hadron Collider (France and Switzerland), Particles (Nuclear physics) -- Instruments, Physics -- Data processing, Particles (Nuclear physics) -- Mathematical models
Journal or Publication Title:	The European Physical Journal C
Publisher:	Springer
ISSN:	1434-6044
Official Date:	18 July 2022
Dates:	Date Event 18 July 2022 Published 24 April 2022 Accepted
Volume:	82
Article Number:	622
DOI:	10.1140/epjc/s10052-022-10366-1
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	9 August 2022
Date of first compliant Open Access:	9 August 2022
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UNSPECIFIED [RS] Royal Society http://dx.doi.org/10.13039/501100000288 UNSPECIFIED Leverhulme Trust http://dx.doi.org/10.13039/501100000275

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