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T: Fachverband Teilchenphysik

T 67: Higgs-Boson (assoziierte Produktion) III

T 67.1: Vortrag

Mittwoch, 2. März 2016, 16:45–17:00, VMP5 HS B1

Study of MVA variables for signal and background separation for the ttH process during Run II with the ATLAS experiment — Matteo Mantoani, Maria Moreno Llacer, •Ishan Pokharel, Arnulf Quadt, and Elizaveta Shabalina — II. Physikalisches Institut, Georg-August-Universität Göttingen

After the discovery of the Higgs boson in 2012, the validation of the properties of this new particle as predicted by the Standard Model has taken a very important stance in physics. The associated production of the Higgs boson with a top and anti-top pair, namely the ttH process provides a direct measurement of the Yukawa coupling between the Higgs boson and the top quark. This analysis focuses on the search for the ttH process in the H→ bb decay mode. The main background to this process is the tt production with jets and ttbb being the irreducible background. With the cross section of production of the ttH process being four orders of magnitude smaller than that of tt, sophisticated multivariate analysis (MVA) methods are needed in order to separate signal from overwhelming background. This analysis focuses on choosing MVA variables based on object kinematic properties and event shape information of the ttH events that allow to separate signal-like events from background. This work will be directly used in the search for the ttH signal with the Run II data at the ATLAS detector.