Abstract
The ratio of the and fragmentation fractions, , in proton-proton collisions at the LHC, is obtained as a function of -meson transverse momentum and collision center-of-mass energy from the combined analysis of different -decay channels measured by the LHCb experiment. The results are described by a linear function of the meson transverse momentum or with a function inspired by Tsallis statistics. Precise measurements of the branching fractions of the and decays are performed, reducing their uncertainty by about a factor of 2 with respect to previous world averages. Numerous decay branching fractions, measured at the LHCb experiment, are also updated using the new values of and branching fractions of normalization channels. These results reduce a major source of systematic uncertainty in several searches for new physics performed through measurements of branching fractions.
- Received 11 March 2021
- Accepted 12 July 2021
DOI:https://doi.org/10.1103/PhysRevD.104.032005
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© 2021 CERN, for the LHCb Collaboration