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The Standard Model of particle physics is extremely well tested and yet isnot believed to be a theory of everything. Many extensions of the StandardModel predict the existence of new particles. The Large Hadron Collider (LHC)is a high energy proton-proton collider which may be able to produce suchparticles. In this work strategies have been developed to search for newphysics by identifying high energy electrons produced by the decay of W bosonusing 2.8 pb-1 of real data. The electron identification for CMS has beenpresented. Simple cut based selections and a complete set of variables todistinguish between real electrons and background electrons are described. Thedetection of electrons is of particular importance at LHC as these particlesintervene in the flagship H -> ZZ* -> 4e and H -> WW* -> 2e2v channels for thesearch of the Standard Model (SM) Higgs. Electrons are also important in manySUSY scenarios as produced in the leptonic decays of charginos and neutralinos.Electrons also appears in searches for TeV resonances that may come from newsymmetries or as consequences of scenarios involving extra spatial dimensions.Last but not the least, electrons appear in the final state of many StandardModel processes involving top quarks or electroweak bosons, that constitutebackgrounds to new signals or are intended to be used as calibration processes.In second part of my thesis background sources for electrons coming from Wbosons have been studied. Electron identification variables are plotted indifferent regions of background, to study the background as deeply as possible.This work has been done for the first time using LHC's real data.

Electron Identification at CMS detector using LHC data