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T: Fachverband Teilchenphysik

T 59: Elektroschwache Wechselwirkung I

T 59.6: Vortrag

Mittwoch, 21. März 2018, 17:50–18:05, Z6 - SR 1.005

Search for the production of WVZ processes in leptonic final states at 13 TeV in ATLAS — Julien Caudron¹, Markus Cristinziani¹, Mazuza Ghneimat¹, Carlo A. Gottardo¹, Sebastian Heer¹, Vadim Kostyukhin¹, Ö. Oğul Öncel^1,2, Arshia Ruina¹, and •Andrea Sciandra¹ — ¹Physikalisches Institut, Universität Bonn — ²Institut für Kernphysik, Universität zu Köln

The triboson production is one of the key processes for studying quartic gauge couplings. Next-to-leading order corrections are mandatory to reduce theoretical uncertainties: the QCD correction is about 100%.

I will discuss the development of a new ATLAS analysis aiming to measure on-shell WWZ and WZZ cross-sections, as the production of triboson processes is becoming accessible at LHC Run 2. The analysis selects events with three or four reconstructed light leptons. The main challenge is the reduction of main backgrounds, i.e. WZ in the three-lepton channel and ZZ in the four-lepton final state. Multivariate techniques are explored, as well as data-driven methods, to estimate the contribution of non-prompt and fake leptons.