Measurement of the ZZ production cross section in p-pbar collisions at sqrt(s)=1.96 TeV

TL;DR

This paper reports a new measurement of the ZZ production cross section in proton-antiproton collisions at 1.96 TeV, using four-lepton final states, with results consistent with theoretical predictions.

Contribution

First measurement of ZZ production cross section at Tevatron in four-lepton channel, combining with previous results for improved accuracy.

Findings

Measured cross section: 1.26 pb with uncertainties.

Observed 10 candidate events with low background.

Results agree with NLO QCD predictions.

Abstract

We present a new measurement of the production cross section $\sigma(p\bar{p} \rightarrow ZZ)$ at a center-of-mass energy $\sqrt{s}=1.96$ TeV, obtained from the analysis of the four charged lepton final state $\ell^{+}\ell^{-}\ell^{'+} \ell^{'-}$ ($\ell$, $\ell^{'}$ = $e$ or $\mu$). We observe ten candidate events with an expected background of $0.37 \pm 0.13$ events. The measured cross section $\sigma(p\bar{p} \to ZZ)= 1.26^{+0.47}_{-0.37} \mathrm{(stat)} \pm 0.14 \mathrm{(syst)}$ pb is in agreement with NLO QCD predictions. This result is combined with a previous result from the $ZZ\to\ell^{+}\ell^{-}\nu\bar{\nu}$ channel resulting in a combined cross section of $\sigma(p\bar{p} \to ZZ)= 1.40^{+0.43}_{-0.37} \mathrm{(stat)} \pm 0.14 \mathrm{(syst)}$ pb.