Full and fast simulation and reconstruction of Higgs decay channels with multi-b-jet final states

Channels with multi-b-jet final states might be important for discovery of Higgs boson in ATLAS experiment on LHC. Full simulation and reconstruction of channels with multi-b-jet final states were done: WH, A->Zh, H->hh->bbbb and ttH. All this channels were already investigated in fast simulation and some of them also with full simualtion but here they are resimulated with new data. Some aspects of full simulation as jet energy reconstruction and influence of electronic noise on mass resolution are described here.