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

Abstract

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

arXiv commentSubmitted to Phys. Rev. D

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