Search for the Standard Model Higgs boson decaying into two photons

With the discovery of a Higgs boson, the standard model of particle physics has been successfully proved giving an answer to the origin of the masses issue, through the electroweak symmetry breaking mechanism. The Higgs decaying to two gammas is presented in this document. Although this channel has a low branching ratio, it provides a clean final state topology, with a peak that can be observed over the background, due mainly to irreducible direct diphoton production and to reducible gamma+jets and jet+jet. The analysis is performed using 2011 and 2012 datasets recorded by the CMS experiment from pp collisions at centre of mass energies of 7 TeV (5.1/fb) and 8 TeV (19.7/fb) and shows the presence of a new boson with a mass of about 125 GeV, that is in agreement with the standard model Higgs boson hypotheses.