Evidence of pair production of longitudinally polarised vector bosons and study of CP properties in ZZ → 4l events with the ATLAS detector at √s = 13 TeV

The ATLAS collaboration

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Abstract

A study of the polarisation and CP properties in ZZ production is presented. The used data set corresponds to an integrated luminosity of 140 fb−1 of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded by the ATLAS detector at the Large Hadron Collider. The ZZ candidate events are reconstructed using two same-flavour opposite-charge electron or muon pairs. The production of two longitudinally polarised Z bosons is measured with a significance of 4.3 standard deviations, and its cross-section is measured in a fiducial phase space to be 2.45 ± 0.60 fb, consistent with the next-to-leading-order Standard Model prediction. The inclusive differential cross-section as a function of a CP-sensitive angular observable is also measured. The results are used to constrain anomalous CP-odd neutral triple gauge couplings.

Original languageEnglish
Article number107
Pages (from-to)1-47
Number of pages48
JournalJournal of High Energy Physics
Volume2023
Issue number12
DOIs
Publication statusPublished - Dec 2023
Externally publishedYes

Bibliographical note

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Keywords

  • Electroweak Interaction
  • Hadron-Hadron Scattering
  • Vector Boson Production

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