Hamburg 2016 – scientific programme

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T: Fachverband Teilchenphysik

T 25: Higgs-Boson (assoziierte Produktion) II

T 25.7: Talk

Monday, February 29, 2016, 18:15–18:30, VMP5 HS B1

Uncertainties related to Higgs production in association with a pair of top quarks — •Tim Michael Heinz Wolf — Nikhef, Amsterdam, Netherlands

The production of a Higgs boson in association with a pair of top quarks (ttH) is one of the processes which raises the most interest for LHC run-2. The process is very interesting since the Higgs boson couples directly to the top quark so an extraction of the top-Yukawa coupling is feasible. The top-Yukawa coupling is an important quantity in the discussion of the validity of the standard model (SM) it self since it drives the Higgs self-coupling to negative values rendering the SM incomplete. The exact value of the top-Yukawa coupling determines whether the universe is in a stable, meta-stable or unstable phase.

Especially the H→ bb final state is interesting since it yields the highest branching ratio among all final states. The QCD uncertainties related to the background of the ttH(bb) final state are large which makes precise assessment of the uncertainties important. I am going to present and quantify the uncertainties coming from gluon splitting in the parton shower as well as the uncertainties coming from different renormalisation and factorisation choice. These findings might provide a more accurate assessment of the uncertainties for the search of ttH(bb) in LHC run-2 with the Atlas detector.