Evidence for Higgs Boson Decays to the tau tau final state with ATLAS detector

par Dr Dimitris Varouchas (LPNHE)

vendredi 7 mars 2014, 14:30 → 15:30 Europe/Paris

Amphi Recherche (Dpt. Physique)

In this seminar, a search for the Standard Model (SM) Higgs boson with a mass of 125 GeV decaying into a pair of tau leptons will be reported. The analysis is based on data samples of p-p collisions collected by the ATLAS experiment at the LHC, corresponding to an integrated luminosity of 20.3.0 1/fb at centre-of-mass energy of sqrt(s)=8 TeV. The observed (expected) deviation from the background-only hypothesis corresponds to a significance of 4.1 (3.2) standard deviations, and the measured signal strength is μ = 1.4+0.5 −0.4. This is evidence for the existence of H → τ+τ− decays, consistent with the Standard Model expectation for a Higgs boson with mH = 125 GeV. A comparison with the respective CMS result will be also reported.