Abstract
The first observation of exotic states with a new quark content decaying to the final state is reported with high significance from an amplitude analysis of the decay. The analysis is carried out using proton-proton collision data corresponding to a total integrated luminosity of collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV. The most significant state, , has a mass of , a width of , and spin parity , where the quoted uncertainties are statistical and systematic, respectively. A new state decaying to the final state is also observed with high significance. In addition, the four previously reported states are confirmed and two more exotic states, and , are observed with significance exceeding 5 standard deviations.
- Received 2 March 2021
- Accepted 7 July 2021
DOI:https://doi.org/10.1103/PhysRevLett.127.082001
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© 2021 CERN, for the LHCb Collaboration