About
A model-independent extraction of the modulus of the Cabibbo– Kobayashi–Maskawa matrix elements Vtb, Vtd, and Vts, is presented for the first time using an event sample enriched in single top quark t-channel events. The analysis uses proton-proton collisions data from the LHC, collected during 2016 with 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 the matrix elements Vtb, Vtd, and Vts are considered in both the production and decay vertices of the top quark in single top quark t-channel production, as well as in the background processes containing top quarks. In the standard model hypothesis of CKM unitarity, a lower limit of |Vtb| > 0.971 is measured at the 95% confidence level. Several beyond-the standard model possibilities are considered, and by releasing all constraints between the involved parameters, the values |Vtb| = 0.988 ± 0.024, and |Vtd|2 + |Vts|2 = 0.06 ± 0.06 are measured. .
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The talk
Credits and licence
- Institution
- CERN
- Department
- LHC Seminar
- Speaker
- Alberto Orso Maria Iorio
- Year
- 2020
- Language
- English
- Source
- CERN
- Licence
- CERN, as CERN states it. CERN's terms
- Attribution
- © CERN. CERN provides its audiovisual media free of charge for educational and informational use, credited to CERN; this lecture is shown in CERN's own player.
- Who can watch
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