Abstract
A study of the and decays is performed using proton-proton collisions at center-of-mass energies of 7, 8 and 13 TeV at the LHCb experiment. The invariant mass spectra from both decay modes reveal a rich content of charmonium resonances. New precise measurements of the and resonance parameters are performed and branching fraction measurements are obtained for decays to , , and resonances. In particular, the first observation and branching fraction measurement of is reported as well as first measurements of the and branching fractions. Dalitz plot analyses of and decays are performed. A new measurement of the amplitude and phase of the -wave as functions of the mass is performed, together with measurements of the , and parameters. Finally, the branching fractions of decays to resonances are also measured.
22 More- Received 5 May 2023
- Accepted 27 June 2023
DOI:https://doi.org/10.1103/PhysRevD.108.032010
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