Test of CP-invariance of the Higgs boson in vector-boson fusion production and in its decay into four leptons

UBC Faculty Research and Publications

Test of CP-invariance of the Higgs boson in vector-boson fusion production and in its decay into four leptons ATLAS Collaboration

Abstract

A search for CP violation in the decay kinematics and vector-boson fusion production of the Higgs boson is performed in the H → ZZ∗ → 4` (` = e, µ) decay channel. The results are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 13 TeV and recorded by the ATLAS detector from 2015 to 2018, corresponding to an integrated luminosity of 139 fb−1 . Matrix element-based optimal observables are used to constrain CP-odd couplings beyond the Standard Model in the framework of Standard Model effective field theory expressed in the Warsaw and Higgs bases. Differential fiducial cross-section measurements of the optimal observables are also performed, and a new fiducial cross-section measurement for vector-boson-fusion production is provided. All measurements are in agreement with the Standard Model prediction of a CP-even Higgs boson.

Item Metadata

Title	Test of CP-invariance of the Higgs boson in vector-boson fusion production and in its decay into four leptons
Creator	ATLAS Collaboration
Publisher	Springer Berlin Heidelberg
Date Issued	2024-05-09
Description	A search for CP violation in the decay kinematics and vector-boson fusion production of the Higgs boson is performed in the H → ZZ∗ → 4` (` = e, µ) decay channel. The results are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 13 TeV and recorded by the ATLAS detector from 2015 to 2018, corresponding to an integrated luminosity of 139 fb−1 . Matrix element-based optimal observables are used to constrain CP-odd couplings beyond the Standard Model in the framework of Standard Model effective field theory expressed in the Warsaw and Higgs bases. Differential fiducial cross-section measurements of the optimal observables are also performed, and a new fiducial cross-section measurement for vector-boson-fusion production is provided. All measurements are in agreement with the Standard Model prediction of a CP-even Higgs boson.
Subject	Hadron-Hadron Scattering; Higgs Physics
Genre	Article
Type	Text
Language	eng
Date Available	2024-10-24
Provider	Vancouver : University of British Columbia Library
Rights	Attribution 4.0 International (CC BY 4.0)
DOI	10.14288/1.0447105
URI	http://hdl.handle.net/2429/89521
Affiliation	Science, Faculty of; TRIUMF; Non UBC; Physics and Astronomy, Department of
Citation	Journal of High Energy Physics. 2024 May 09;2024(5):105
Publisher DOI	10.1007/JHEP05(2024)105
Peer Review Status	Reviewed
Scholarly Level	Faculty
Copyright Holder	The Author(s)
Rights URI	http://creativecommons.org/licenses/by/4.0/
Aggregated Source Repository	DSpace

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