ATLAS Sensitivity Prospects for 1 Higgs Boson Production at the LHC Running at 7, 8 or 9 TeV

Projections for the ATLAS sensitivity to the Standard Model boson from LHC running at 7 and 8 TeV are reported. These studies extend our previous 7 TeV results by adding extra channels for low and high mass Higgs bosons and using more accurate cross-sections calculations. There are also a range of possible luminosity scenarios considered. The projections are largely derived using the ratio of cross-sections at difference centre-of-mass energies; this is completely true for beam energies other than 7 TeV. The ATLAS experiment, with 1 fb−1 at 7 TeV, should have exclusion sensitivity between 128 and 460 GeV using rather conservative assumptions. If 2 fb−1at 8 TeV is available with analysis improvements, the sensitive region becomes from 120 to over 500 GeV.