Observation of the Y1/3D/J bottomonium state through decays to n+n Y1s

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Abstract

Based on 122×106Υ(3S) events collected with the BABAR detector, we have observed the Υ(13DJ) bottomonium state through the Υ(3S)→γγΥ(13DJ) →γγπ⊃+π⊃-Υ(1S) decay chain. The significance for the J=2 member of the Υ(13DJ) triplet is 5.8 standard deviations including systematic uncertainties. The mass of the J=2 state is determined to be 10164.5±0.8(stat)±0.5(syst)MeV/c2. We use the π⊃+π⊃- invariant mass distribution to confirm the consistency of the observed state with the orbital angular momentum assignment of the Υ(13DJ). Copyright © 2010 American Physical Society.

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Del Amo Sanchez, P., Lees, J. P., Poireau, V., Prencipe, E., Tisserand, V., Garra Tico, J., … Wu, S. L. (2010). Observation of the Y1/3D/J bottomonium state through decays to n+n Y1s. Physical Review D - Particles, Fields, Gravitation and Cosmology, 82(11). https://doi.org/10.1103/PhysRevD.82.111102

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