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

Abstract

A search for CP violation in the decay kinematics and vector-boson production of the Higgs boson is performed in the $H\to Z{Z}^{\ast }\to 4\ell$ ($\ell =e,\mu$) 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 $\mbox{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.

66 pages in total, author list starting page 49, 17 figures, 6 tables, published in JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2018-30/

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• Impact of NLO Weak SMEFT Corrections in $e^{+}{e}^{-}\to ZH$
• Characterising the Higgs boson with ATLAS data from Run 2 of the LHC
• Why detect forward muons at a muon collider
• Search for $\gamma$H production and constraints on the Yukawa couplings of light quarks to the Higgs boson
• Searching for HWW Anomalous Couplings with Simulation-Based Inference
• $CP$-violating effects of the neutral triple gauge couplings in $Z(\ell \ell )\gamma$ production at the LHC
• Combination of measurements of CP properties of Higgs boson interactions with vector bosons using proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector