Strategia per una prima osservazione della produzione del dibosone ZZ nello stato finale a quattro leptoni a 10 TeV a CMS

The subject of this thesis is a study of the ZZ channel with the CMS experiment at the LHC. It is based on the H->ZZ*->4l analysis, described in Chapter 4, focusing on the direct observation of ZZ production in the fully leptonic final states (Chapter 5). This analysis is performed at a centre of mass energy of 10 TeV for an integrated luminosity of 1 fb^{-1}. The main goal is to develop a uniform strategy for all the three final states (4mu, 4e and 2e2mu) to be applied to the first LHC data. In particular, it is intended to be a basic study of the irreducible ZZ background of the Higgs ¿golden channel¿, H->ZZ*->4l. Also, a simple method to control Zbb(bar) and tt(bar) backgrounds of ZZ from data is presented (Chapter 6).