Abstract
The first observation of two structures consistent with resonances in the final states and is reported using samples of collision data collected by the LHCb experiment at and 8 TeV, corresponding to an integrated luminosity of . The ground states and are also confirmed and their masses and widths are precisely measured.
- Received 4 October 2018
DOI:https://doi.org/10.1103/PhysRevLett.122.012001
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© 2019 CERN, for the LHCb Collaboration