Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 7: Top Quarks: Properties 1
T 7.5: Vortrag
Montag, 21. März 2022, 17:15–17:30, T-H20
Measurement of the top quark width from Wb scattering — Thorsten Chwalek1, Matteo Defranchis2, Nils Faltermann1, Jan Kieseler2, Matthias Komm2, •Marco Link1, Martijn Mulders2, Thomas Müller1, Michael Pitt2, and Pedro Silva2 — 1Institut für Experimentelle Teilchenphysik (ETP), Karlsruher Institut für Technologie (KIT) — 2CERN
The top quark is the heaviest elementary particle in the standard model (SM). As such it is especially interesting to search for hints of physics beyond the standard model (BSM). Current measurements of the top quark decay width make strong assumptions on the branching ratio of the top quark into a W boson and a bottom quark (Wb).
This talk explores the possibility of the model independent measurement of the top quark decay width in Wb→Wb scattering via a top quark propagator at the CMS experiment. Generator level studies are used to develop reconstruction methods for the Wb system. In combination with a measurement of the single top cross section this measurement could be sensitive to effects from BSM physics. Given the limited size of the current data set and the small cross section of the signal process, the measurement will be interesting with the increase of data expected during HL-LHC data taking.