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T: Fachverband Teilchenphysik

T 106: Top quarks: Single top production

T 106.8: Vortrag

Freitag, 3. April 2020, 12:45–13:00, L-4.001

Measurement of highly boosted W-associated single top quark production with CMS — •Christopher Matthies, Paolo Gunnellini, Johannes Haller, and Roman Kogler — Institut für Experimentalphysik, Universität Hamburg

A measurement of W-associated single top quark production in the highly boosted regime in proton–proton collisions at √s = 13 TeV with the CMS experiment is presented. The measurement focusses on the ℓ+jets final state in which the top quark decays hadronically and the associated W boson leptonically, leading to a distinct event signature with a hadronic and a leptonic hemisphere. The HOTVR jet clustering and tagging algorithm is used to identify the fully merged top quark decay. Deep learning techniques are used to discriminate the tW signal from top quark pair production and other background processes. It is shown that a measurement up to a transverse momentum of about 1 TeV of the top quark is feasible, extending the range of previous measurements considerably.