Search for an additional heavy Higgs boson in the H->ZZ->2l2q/2v2q decay channel with ATLAS detector

In July 2012, the ATLAS and CMS experiments at LHC reported the observation of a new particle with a mass of about 125GeV and with properties consistent with the expected SM Higgs boson. It's important to verify whether this new particle is part of an extended scalar sector as populated by various extensions to the SM such as 2HDM and EWS model, and searching for the additional Higgs can help us to better understand EWSB process, as well as precision measurement of the 125GeV resonance. The additional heavy Higgs search with centre-of-mass energy of 8TeV with an integrated luminosity of 20.3$fb^{-1}$ data collected by ATLAS detector is presented here, the mass range in this search is from 200GeV(llqq)/400GeV(vvqq) to 1TeV.