Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 28: Higgs-Boson 3 (assoziierte Produktion)

T 28.2: Vortrag

Dienstag, 28. März 2017, 11:15–11:30, JUR 3

Optimization studies for the search of Higgs bosons in association with a top-antitop quark pair with the ATLAS experiment in Run 2 — Maria Moreno Llacer, Arnulf Quadt, Elizaveta Shabalina, and •Gaoyuan Wang — II. Physikalisches Institut, Georg-August-Universität Göttingen

The measurement of the production of the Higgs boson in association with a tt pair (ttH) where the Higgs boson decays into a bb pair (H → bb) is very interesting because it is the only possible simultaneous measurement of the Yukawa coupling of the Higgs boson to top and bottom quarks. This is the channel with the strongest coupling between the Higgs boson and quarks. The major background of our study is the production of tt along with a bb quark pair. The goal is to observe the ttH channel out of all the backgrounds using data collected by the ATLAS detector during the LHC Run 2.
One can optimize the analysis already presented using a partial dataset by tightening the jet momenta threshold for the hardest ones and loosening the threshold for the softer ones in order to reject as much background as possible and keep the soft jets coming from the W decay, which are useful for the final state reconstruction. An optimized neural network to discriminate the backgrounds from the signal in this optimized configuration can also be exploited.