Abstract
The element of the Cabibbo-Kobayashi-Maskawa matrix is measured using semileptonic decays produced in proton-proton collision data collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of . Rates of and decays are analyzed using hadronic form-factor parametrizations derived either by Caprini, Lellouch and Neubert (CLN) or by Boyd, Grinstein and Lebed (BGL). The measured values of are and in the CLN and BGL parametrization, respectively. The first uncertainty is statistical, the second systematic, and the third is due to the external inputs used in the measurement. These results are in agreement with those obtained from decays of and mesons. They are the first determinations of at a hadron-collider experiment and the first using meson decays.
- Received 10 January 2020
- Accepted 9 March 2020
DOI:https://doi.org/10.1103/PhysRevD.101.072004
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© 2020 CERN, for the LHCb Collaboration