Abstract
The first observation of the decays is reported, using proton-proton collision data corresponding to an integrated luminosity of , collected with the LHCb detector. These decays are suppressed due to limited available phase space, as well as due to Okubo-Zweig-Iizuka or Cabibbo suppression. The measured branching fractions are , . For the meson, the result is much higher than the expected value of . The small available phase space in these decays also allows for the most precise single measurement of both the mass as and the mass as .
- Received 18 February 2019
- Revised 26 March 2019
DOI:https://doi.org/10.1103/PhysRevLett.122.191804
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© 2019 CERN, for the LHCb Collaboration