Prof. Marko Mikuž: Higgs Boson Searches with the ATLAS Detector
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Higgs Boson Searches with the ATLAS Detector
Prof. Marko Mikuž, Oddelek za fiziko FMF Univerze v Ljubljani in Institut "Jožef Stefan", za kolaboracijo ATLAS
Due to exceptional performance of the Large Hadron Collider at CERN in 2011, which delivered 5 fb-1 of data per experiment, both omni-purpose detectors, ATLAS and CMS, were able to extend their searches for the last missing piece of the Standard model well beyond their initial plans. They both managed to constrain the Higgs particle to a narrow mass region between 115 and 130 GeV. Around 126 GeV they both observed tantalizing hints of Higgs appearance, which are however not significant enough to claim evidence.
In the seminar, we will focus on the ATLAS experiment where numerous Slovenian scientists are actively contributing to the effort. We shall review the Higgs phenomenology relevant for its detection at LHC, the detectors of the ATLAS experiment, and the relevant triggers, needed to extract the Higgs from the myriad of background events. Processing of data and the statistical tools needed to quantify the signal in presence of background will be described. We will close with the results on exclusion limits and possible signal significance, and revise the prospects for 2012.