Search for a Higgs Boson in the H - > WW - > IvIv channel at CMS

In this thesis work, the search for a Higgs boson at CMS in the WW fully leptonic decay channel is presented. Two different production mechanisms have been analysed: the Vector Boson Fusion (VBF) and the Higgs-strahlung (VH). Given the leptonic decays of WW, in order to guarantee a good electron reconstruction and identification, the electromagnetic calorimeter alignment has been studied. In addition, both the VBF and the VH analyses relies on the capability of CMS to reconstruct jets: one of the first measurements of CMS, with data collected during 2010 run, looking at the simultaneous production of one central jet and one forward jet, is described. Higgs search analysis optimization, data driven estimation of the main backgrounds and the results obtained with 7 and 8 TeV collisions are reported. The analysis excludes a Higgs boson with 95% confidence level with a mass between 135 and 200 GeV.