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T: Fachverband Teilchenphysik

T 25: Higgs-Boson (assoziierte Produktion) II

T 25.3: Talk

Monday, February 29, 2016, 17:15–17:30, VMP5 HS B1

Background Estimation in the Associated Higgs Boson Top-Quark Production Channel ttH→ 2ℓ + 1 τ_had at √s= 13 TeV with ATLAS — •Babar Ali¹, Simonetta Gentile², Marine Kuna², Simone Monzani², Frank Seifert², and Andre Sopczak¹ — ¹IEAP CTU in Prague — ²Universita di Roma, La Sapienza, INFN

The measurement of the associated production of a Higgs boson with a pair of top quarks is a direct determination of the top-Yukawa coupling at tree-level, which can be compared with the indirect determination in the loop-production via gluon-gluon fusion. The decay channel of the system with several leptons (multi-lepton channel) and jets gives high sensitivity. The focus of the analysis is the sub-channel with two same-sign light leptons (electrons or muons) and a hadronically decaying tau lepton: ttH → 2ℓ + 1 τ_had. In particular the background estimate from top-antitop reactions is discussed. The analysis uses the data set recorded by ATLAS in 2015 from the first LHC Run-II 13 TeV proton-proton collisions.