Abstract
We report the observation of a new structure in the spectrum using the full LHCb data set of collisions, corresponding to an integrated luminosity of , collected at , 8, and 13 TeV. A study of the structure suggests its interpretation as a superposition of two almost degenerate narrow states. The masses and widths of these states are measured to be with a mass splitting of , where the first uncertainty is statistical, the second systematic. The third uncertainty for the mass measurements derives from the knowledge of the mass of the baryon. The measured masses and widths of these new excited states suggest their possible interpretation as a doublet of states.
- Received 6 August 2019
- Revised 27 August 2019
DOI:https://doi.org/10.1103/PhysRevLett.123.152001
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
© 2019 CERN, for the LHCb Collaboration