Search for Higgs Particle in high energy proton collision experiment

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In LHC accelerator and ATLAS detector, we obtained the first collision data at the center of mass energy of 900 GeV, 2, 36 TeV and 7 TeV. Electrons and photons are main probe to search for Higgs particle in this study. We studied reconstruction and identification of electrons and photons and report the results in an international conference. The inner detector plays a key role in this study. We successfully took high quality data, which was reported in Japanese Physical Society Meeting. As a study of background, an event generator for di-photon production in QCD with higher order correction was developed. The result was report in Japanese Physical Society Meeting.