| In this thesis, we report the result on the search for the Standard Model(SM) Higgs boson decaying to a pair of W in the full leptonic final state using data collected by CMS detector at LHC at 7 and 8 TeV. The integrated luminosity is 4.9 fb-1 and 19.5 fb-1 at 7 and 8 TeV, respectively. The SM Higgs hypothesis is excluded at CL s=95% in mH = 128 -- 600 GeV. An excess of data is observed around mH = 125 GeV which corresponds to significance of 4.0sigma on the background-only hypothesis. The measured production rate normalized to the SM prediction is 0:76 +/- 0.13(stat.) +/- 0.16(syst.). A hypothesis test on the spin-parity nature of the new boson shows that data prefers SM Higgs boson to the graviton-like spin-2 model or spin-0 pseudo-scalar model. |
