We present the first evidence for the production of [Formula Presented] states in the four-photon cascade, [Formula Presented] [Formula Presented] [Formula Presented] [Formula Presented] followed by the [Formula Presented] annihilation into [Formula Presented] or [Formula Presented] The signal has a significance of 10.2 standard deviations. The measured product branching ratio for these five decays, [Formula Presented] is consistent with the theoretical estimates. The data are dominated by the production of one [Formula Presented] state consistent with the [Formula Presented] assignment. Its mass is determined to be [Formula Presented] MeV, which is consistent with the predictions from potential models and lattice QCD calculations. We also searched for [Formula Presented] [Formula Presented] followed by either [Formula Presented] or [Formula Presented] We find no evidence for such decays and set upper limits on the product branching ratios.

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Persistent URL dx.doi.org/10.1103/PhysRevD.70.032001
Journal Physical Review D - Particles, Fields, Gravitation and Cosmology
Bonvicini, G. (G.), Cinabro, D. (D.), Dubrovin, M. (M.), Bornheim, A. (A.), Lipeles, E. (E.), Pappas, S.P. (S. P.), … Csorna, S.E. (S. E.). (2004). First observation of a Υ(1D) state. Physical Review D - Particles, Fields, Gravitation and Cosmology, 70(3). doi:10.1103/PhysRevD.70.032001