Würzburg 2018 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 82: Higgs IV
T 82.8: Vortrag
Donnerstag, 22. März 2018, 18:20–18:35, Z6 - HS 0.004
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 — Julien Caudron1, Markus Cristinziani1, Mazuza Ghneimat1, Carlo A. Gottardo1, Sebastian Heer1, David Hohn1, Vadim Kostyukhin1, Ö. Oğul Öncel1,2, Arshia Ruina1, and •Andrea Sciandra1 — 1Physikalisches Institut, Universität Bonn — 2Institut für Kernphysik, Universität zu Köln
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 a high purity and is not strongly affected by non-prompt backgrounds, events that contain leptons which are not originating from the primary interaction vertex.
The analysis selects events with exactly four reconstructed leptons and multiple jets. The most dominant background is the production of ttZ, whose four leptons have a kinematics very similar to that of leptons in signal events, and diboson, whose cross section is much larger. I will present the ATLAS analysis performed with 36 fb−1, which has been recently realeased.