Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 57: Higgs III

T 57.2: Talk

Wednesday, March 21, 2018, 16:45–17:00, Z6 - HS 0.004

Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detector: same-charge lepton pair plus tau channel — •Andre Sopczak¹, Babar Ali¹, Simonetta Gentile², and Marine Kuna² — ¹IEAP CTU in Prague — ²Dipartimento di Fisica "G.Marconi" Universita di Roma, Sapienza

After the discovery of a Higgs boson, the measurements of its properties are at the forefront of research. The determination of the associated production of a Higgs boson and a pair of top quarks is of particular importance as the ttH Yukawa coupling is large, and thus a probe for physics beyond the Standard Model. Recently evidence for the coupling has been established.

The ttH production was analysed in the final state with two same-sign light leptions (electrons or muons) and a hadronically decaying tau lepton: ttH → 2ℓ + 1 τ_had. The analysis was based on data taken by the ATLAS experiment recorded from 13 TeV proton-proton collisions. It contributed to the combined ATLAS results of the multi-lepton final state analyses. These results were further combined with other ATLAS ttH analyses where H→ γγ and H→ bb. The combined results are consistent with the Standard Model (SM) expectation allowing models beyond the SM to be constrained.