Reconstruction et identification de jets beaux dans l'expérience LHCb en vue d'étudier sa sensibilité à un boson de Higgs standard se désintégrant en paires $b\overline{b}$

LHCb sensitivity to a standard model Higgs in the $H+(W,Z) \to b\bar{b}+(l\bar{l},\nu_{l}l)$ channel has been studied. Different effects affecting jet reconstruction have been studied at generator and full si- mulation of the detector level. After correction di-b-jet, mass resolution is sigma/mean = 22%. b-jet identification procedure has been set up, selecting ~80% of b-jets while rejecting ~99.5% of other jets. After reducing the bbbar + l physical background, a statistical significance of 1 is obtained for 4 years of data taking at a luminosity of $5.10^{32}cm^{-2s}^{-1}$.