Measurement of the WW, WZ and ZZ cross sections at CMS

This note presents an updated measurement of $\mathrm{W^+W^-}$ production, and first measurements of WZ and ZZ production in proton proton collisions at $\sqrt{s} = 7$ TeV with the CMS experiment at the Large Hadron Collider. Results are based on data corresponding to an integrated luminosity of $1.1~\ensuremath{\mathrm{fb^{-1}}}$. The leptonic decay modes of the $W$ and $Z$ bosons are considered and the final states include electrons, muons, taus and missing transverse energy. The following cross sections are determined: $ \sigma( pp \to \mathrm{W^+W^-} + X ) = 55.3 \pm 3.3~(\text{stat.}) \pm 6.9~(\text{syst.}) \pm 3.3~(\text{~lumi.})~\pb$, $ \sigma( pp \to \mathrm{WZ} + X ) = 17.0 \pm 2.4~(\text{stat.}) \pm 1.1~(\text{syst.}) \pm 1.0~(\text{~lumi.})~\pb$ and $\sigma( pp \to \mathrm{ZZ} + X ) = 3.8 ^{+1.5}_{-1.2}~(\text{stat.}) \pm 0.2~(\text{syst.}) \pm 0.2~(\text{~lumi.})~\pb$. The measured cross sections are found to be consistent with the Standard Model.