Eur. Phys. J. C (2003) 30: 447-466
https://doi.org/10.1140/epjc/s2003-01287-0

experimental physics

ZZ production in e ⁺ e ^- interactions at $\sqrt{s} =$ 183-209 GeV

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 $q \bar{q} q \bar{q}$, $\nu \bar{\nu} q \bar{q}$, $\mu^+ \mu^- q \bar{q}$, $e^+e^- q \bar{q}$, $\tau^+ \tau^- q \bar{q}$, l ⁺ l ^- l ⁺ l ^-, and $\nu \bar{\nu} l^+l^-$ (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.