Gottardo, Carlo Alberto Search for Anomalous Production of Higgs Boson Pairs with the CMS Detector. [Magistrali biennali]
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This thesis consists of a study of the double Higgs production as the only means to probe the Higgs self-coupling λ(lambda) The final state chosen, featuring four b-jets, has a tiny cross section (9.96 fb at 8 TeV) and is overwhelmed by irreducible background. This study takes advantage of statistical and multivariate methods to characterize the signal and extract a limit on the signal strength on the data collected by the Compact Muon Solenoid (CMS) experiment at the LHC. Beyond Standard Model scenarios,accounting for anomalies in the the Higgs trilinear coupling λ and the Yukawa coupling with top quarks within the known constraints, are explored too. A limit has been extracted in all the scenarios considered, producing, in the Standard Model case, a result compatible with the one obtained by the ATLAS collaboration.
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