Higgs Boson Searches with ATLAS

par Dr Jana Schaarschmidt (LAL)

lundi 16 janv. 2012, 14:00 → 16:00 Europe/Paris

by Dr. Schaarschmidt, Jana. The search for the Higgs boson is one of the key goals of the ATLAS experiment at the Large Hadron Collider (LHC). During 2011 almost 5 fb-1 of collision data at sqrt(s) = 7 TeV have been collected. Updated results by ATLAS and CMS were presented recently to the public, showing possible first hints for a low mass SM Higgs boson, but no final conclusions were drawn. All decay channels sensitive to a low mass Higgs boson signal show small excesses. The largest excess is found in the H to gamma gamma channel by ATLAS at mH = 126 GeV with a global signicance of 1:5 sigma. The combination of all channels in ATLAS yields a global significance of 2:3 sigma. The SM Higgs boson hypothesis is excluded by ATLAS in the mass range of 131-237 GeV and 251-468 GeV, while the expected exclusion is in the range 125-520 GeV.