Measurement of the ZZ production cross section and search for anomalous couplings in 2l2l' final states in pp collisions at sqrt(s) = 7 TeV

TL;DR

This paper reports a measurement of the ZZ production cross section in proton-proton collisions at 7 TeV using CMS data, confirming consistency with the Standard Model and setting limits on anomalous gauge couplings.

Contribution

First measurement of ZZ production cross section at 7 TeV in 2l2l' final states with limits on anomalous couplings using CMS data.

Findings

Measured cross section: 6.24 pb with uncertainties.

Consistent with Standard Model predictions.

Set limits on anomalous ZZZ and ZZγ couplings.

Abstract

A measurement is presented of the ZZ production cross section in the ZZ to 2l 2l' decay mode with l = e, mu and l' = e, mu, tau in proton-proton collisions at sqrt(s) = 7 TeV with the CMS experiment at the LHC. Results are based on data corresponding to an integrated luminosity of 5.0 inverse femtobarns. The measured cross section sigma(pp to ZZ) = 6.24 [+0.86/-0.80] (stat.) [+0.41/-0.32] (syst.) +/- 0.14 (lumi.) pb is consistent with the standard model predictions. The following limits on ZZZ and ZZ gamma anomalous trilinear gauge couplings are set at 95% confidence level: -0.011 < f[4;Z] < 0.012, -0.012 < f[5;Z] < 0.012, -0.013 < f[4;gamma] < 0.015, and -0.014 < f[5,gamma] < 0.014.