Measurement of CKM matrix elements in single top quark $t$-channel production in proton-proton collisions at $\sqrt{s} = $ 13 TeV

  • Freya Blekman (Creator)
  • Emil Sørensen Bols (Creator)
  • Simranjit Singh Chhibra (Creator)
  • Jorgen D'Hondt (Creator)
  • Jarne Theo De Clercq (Creator)
  • Denys Lontkovskyi (Creator)
  • Steven Lowette (Creator)
  • Ivan Marchesini (Creator)
  • Seth Moortgat (Creator)
  • Quentin Python (Creator)
  • Stefaan Tavernier (Creator)
  • Walter Van Doninck (Creator)
  • Petra Van Mulders (Creator)
  • Douglas Burns (Creator)

Dataset

Abstract

The first direct, model-independent measurement is presented of the modulus of the Cabibbo--Kobayashi--Maskawa (CKM) matrix elements $|V_{tb}|$, $|V_{td}|$, and $|V_{ts}|$, in final states enriched in single top quark $t$-channel events. The analysis uses proton-proton collision data from the LHC, collected during 2016 by the CMS experiment, at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of $35.9 fb^{-1}$. Processes directly sensitive to these matrix elements are considered at both the production and decay vertices of the top quark. In the standard model hypothesis of CKM unitarity, a lower limit of $|V_{tb}| > 0.970$ is measured at the $95\%$ confidence level. Several theories beyond the standard model are considered, and by releasing all constraints among the involved parameters, the values $|V_{tb}| = 0.988 \pm 0.024 $, and $|V_{td}|^2 +|V_{ts}|^2 = 0.06 \pm 0.06$, where the uncertainties include both statistical and systematic components, are measured.
Datum van beschikbaarheid29 dec 2020
UitgeverHEPData

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