ZZ production in e+e- interactions at sqrt(s) = 183 - 209 GeV

TL;DR

This paper reports measurements of on-shell ZZ production in electron-positron collisions at energies between 183 and 209 GeV, using DELPHI data, confirming consistency with Standard Model predictions across multiple final states.

Contribution

First comprehensive measurement of ZZ production at these energies, updating previous results and covering various final states with high precision.

Findings

Measured cross-sections agree with Standard Model

Results update previous measurements at 183 and 189 GeV

Data covers multiple decay channels with consistent results

Abstract

Measurements of on-shell ZZ production are described, using data from the DELPHI experiment at LEP in e+e- collisions at centre-of-mass energies between 183 and 209 GeV, corresponding to an integrated luminosity of about 665 pb^{-1}. Results obtained in each of the final states q anti-q q anti-q, nu anti-nu q anti-q, mu+ mu- q anti-q, e+ e- q anti-q, tau+ tau- q anti-q, l+ l- l+ l-, and nu anti-nu l+ l- (with l=e,mu) are presented. The measured production cross-sections are consistent with the Standard Model expectations. These results update and supersede those already published at 183 and 189 GeV.