Using the CLEO detector at the Cornell Electron Storage Ring we have observed the [Formula presented] ([Formula presented] ground state) in the decay [Formula presented]. We find a signal of [Formula presented] events. The probability that we have observed a background fluctuation is [Formula presented]. We measure [Formula presented] and [Formula presented]. This is the first statistically significant observation of an individual decay mode of the [Formula presented] in [Formula presented] annihilation and the first example of a baryon decaying via [Formula presented] emission, where no quarks from the first generation participate in the reaction.

Additional Metadata
Persistent URL dx.doi.org/10.1103/PhysRevLett.89.171803
Journal Physical Review Letters
Citation
Ammar, R. (R.), Besson, D. (D.), Zhao, X. (X.), Anderson, S. (S.), Frolov, V.V. (V. V.), Kubota, Y. (Y.), … Edwards, K.W. (2002). Observation of the Decay [Formula presented]. Physical Review Letters, 89(17). doi:10.1103/PhysRevLett.89.171803