Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 50: Higgs-Boson 5 (assoziierte Produktion)

T 50.5: Vortrag

Dienstag, 28. März 2017, 17:45–18:00, JUR 5

Search for the production of the Higgs boson in association with a pair of top quarks in the four leptons final state at 13 TeV in ATLAS — Nello Bruscino, Julien Caudron, Markus Cristinziani, Mazuza Ghneimat, Carlo Alberto Gottardo, Sebastian Heer, David Hohn, Vadim Kostyukhin, •Andrea Sciandra, and Kaven Yau Wong — Physikalisches Institut, Universität Bonn

The top Yukawa coupling is predicted to be large by the Standard Model and can be directly accessed by measuring ttH production at LHC. Depending on the decay of the Higgs boson and the top quark pair several final states are possible. The four lepton channel is statistically limited by the small branching fraction, but it has an extremely high purity, excellent signal-to-background ratio, and is not highly affected by non-prompt backgrounds, events whose leptons are not coming from the primary interaction vertex.
The analysis selects events with exactly four reconstructed leptons and multiple jets. The most dominant backgrounds are ttZ, whose four leptons have a kinematics very similar to that of leptons in signal events, and diboson, whose cross section is much higher. I will present the ATLAS public analysis performed with 13 fb⁻¹ and further improvements with the full dataset at 36 fb⁻¹.