Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 88: Top Quarks: Production (Exp.) 3

T 88.7: Vortrag

Donnerstag, 24. März 2022, 17:45–18:00, T-H19

Simultaneous measurement of tt+X(bb) processes in the semileptonic channel at the CMS experiment — •Rufa Rafeek, Emanuel Pfeffer, Jan van der Linden, Michael Waßmer, and Ulrich Husemann — Institute of Experimental Particle Physics (ETP), Karlsruhe Institute of Technology (KIT)

Top quark anti-quark pairs (tt) are produced in association with other particles (X) where X can be the Higgs boson, Z/W boson or QCD-initiated heavy flavour jets (bb/cc). The measurement of tt+X is a direct probe of the coupling of standard model particles like the Higgs and Z boson to the top quark and may reveal new physics effects in modifications of these couplings.
The analysis is challenging as these processes, particularly when the bosons decay into heavy flavour quarks, like for example, tt+H (H→ bb) and tt+bb or tt+Z (Z→ bb), share the same signature and kinematic features. These high jet multiplicity final states create ambiguities in the reconstruction and identification of these processes and thus, it is hard to differentiate them from each other. Due to this challenge, an attempt to simultaneously measure these tt+X processes is made by exploring multivariate analysis strategies.
In this talk, an overview of the ongoing analysis, designed with the full Run-2 data of the LHC using the single lepton channel, is given.