The understanding of the Electroweak Symmetry Breaking after the discovery of a Higgs-like boson with the ATLAS detector

par Dr Andrea Coccaro (University of Washington/Seattle)

vendredi 22 févr. 2013, 14:30 → 16:30 Europe/Paris

Amphi Recherche (Dpt Physique)

A new era of precise measurements in particle physics undoubtedly began with the discovery of the Higgs-like particle announced by both the ATLAS and CMS collaborations on July 4th, 2012. The new discovered particle resembles in many ways the Higgs boson responsible of the Electroweak Symmetry Breaking (EWSB) in the Standard Model (SM) even if its discovery was only driven by the most sensitive channels for the low-mass region, H->gammagamma and H->ZZ->4l. In this seminar, I will present my ongoing contributions in probing the nature of the EWSB mechanism studying the H->bb decay mode to verify its couplings to fermions and studying an invisibly decaying Higgs boson with a branching ratio down to ~10% to explore possible new physics contributions beyond the SM. Different but complementary aspects of this project are all considered, e.g. the triggering strategies, the reconstruction techniques, the calibration of the b-tagging algorithms and the analysis techniques, since my interests spans in all these different activities.