Etude de la production associée ZH/WH, H $\to \gamma\gamma$ avec le détecteur ATLAS

In the Standard Model, a doublet scalar Higgs field is predicted leading to the presence of a neutral scalar particle, the Higgs boson. The LEP experiments have set a lower bound on the Higgs mass at 114.5 GeV. The electroweak precision measurements, constrain indirectly the SM Higgs boson mass to be below 144 GeV at 95 % C.L. In this mass range, the Higgs boson decay into photons is one of the most important channels for the search of this boson at LHC in ATLAS experiment. Here, we evaluate the possibility to use the associated Higgs production with a Z or W boson. The signal over background ratio is better than the inclusive analysis. The associated Higgs production can be used to increase the statistical significance of the Higgs boson discovery. It can also be used to measure the Higgs couplings to the weak bosons.