Study of Di-Boson Production with CMS Detector at LHC

In this note, we investigate the CMS potential for the observation and study of the pp->ZZ->e+e-e+e- and pp->WZ->3l (l=e,mu) reactions, using fully simulated signal and background samples. We show that these processes are potentially accessible with early CMS data, thanks to relatively high production cross sections at LHC energies, together with clear signatures of the multi-lepton final states. We address the main systematic effects relevant for cross section measurements with 1 and 10 fb-1 of data. We demonstrate that multiple gauge-boson production in pp collisions at LHC energies can be observed in the early phase of the experiment, with an integrated luminosity of 1 fb-1 or less.