Hamburg 2016 – scientific programme

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T: Fachverband Teilchenphysik

T 3: Higgs-Boson (assoziierte Produktion) I

T 3.6: Talk

Monday, February 29, 2016, 12:15–12:30, VMP5 HS B1

Study of the production of Higgs bosons in association with a top-antitop quark pairs for Run2 with the ATLAS experiment — •Matteo Mantoani, Maria Moreno LLacer, Arnulf Quadt, and Elizaveta Shabalina — II. Physikalisches Institut, Georg-August-Universität Göttingen

The ttH (H→ b b) channel is a very important and challenging channel to measure the production of the Higgs Boson because its cross section is proportional to the Yukawa couplings of the Higgs boson to top and bottom quarks and because it is a channel in which the Higgs Boson only couples to quarks. The main background to ttH (H→ b b) is the t tbb process. Since it is an irreducible background, sophisticated techniques are required to distinguish the signal from this overwhelming background. The goal of this work is to search of the Higgs Boson in the ttH (H→ b b) channel during Run II at the LHC using events recorded by the ATLAS detector. The analysis uses multivariate techniques (MVA) to discriminate the signal from the background in the selection regions with significant t tH contribution. The MVA are built using Neural Networks (NN). The NN are particularly useful when no single variable which exhibits a clear separation between signal and background is available. Variables used to build the NN can be defined and validated in order to increase the separation power of the NN as much as possible.