We present new measurements of photon energies and branching fractions for the radiative transitions [Formula Presented] The masses of the [Formula Presented] states are determined from the measured radiative photon energies. The ratio of mass splittings between the [Formula Presented] substates, [Formula Presented] with [Formula Presented] the [Formula Presented] mass, provides information on the nature of the [Formula Presented] confining potential. We find [Formula Presented] This value is somewhat lower than the previous world average, but more consistent with the theoretical expectation that [Formula Presented] i.e., that this mass splitting ratio is smaller for the [Formula Presented] states than for the [Formula Presented] states.

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Persistent URL dx.doi.org/10.1103/PhysRevD.59.032003
Journal Physical Review D - Particles, Fields, Gravitation and Cosmology
Citation
Edwards, K.W. (K. W.), Bellerive, A, Janicek, R. (R.), MacFarlane, D.B. (D. B.), Patel, P.M. (P. M.), Sadoff, A.J. (A. J.), … Thaler, J.J. (J. J.). (1999). Measurement of the mass splittings between the [Formula Presented] states. Physical Review D - Particles, Fields, Gravitation and Cosmology, 59(3). doi:10.1103/PhysRevD.59.032003