Measurement of CKM matrix elements in single top quark t-channel production in proton-proton collisions at √s=13 TeV
The first direct, model-independent measurement is presented of the modulus of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements $$|V_\mathrm{tb}|$$, $$|V_\mathrm{td}|$$, and $$|V_\mathrm{ts}|$$, 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 $$|V_\mathrm{tb}|$$ $$>$$ 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 $$|V_\mathrm{tb}| =$$ 0.988 $$\pm$$ 0.024, and $$|V_\mathrm{td}|^2 + |V_\mathrm{ts}|^2 =$$ 0.06 $$\pm$$ 0.06, where the uncertainties include both statistical and systematic components, are measured.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- CMS Collaboration
- Grant/Contract Number:
- AC02-07CH11359; SC0010005
- OSTI ID:
- 1638427
- Alternate ID(s):
- OSTI ID: 1644279; OSTI ID: 1721713
- Report Number(s):
- FERMILAB-PUB-20-190-CMS; arXiv:2004.12181; CMS-TOP-17-012; CERN-EP-2020-047; oai:inspirehep.net:1792999; TRN: US2202858
- Journal Information:
- Physics Letters. B, Vol. 808; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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