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).

Sanchez, P., Lees, J., Poireau, V., Prencipe, E., Tisserand, V., Tico, J., et al. (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) [10.1103/PhysRevD.82.111102].

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

CARPINELLI, Massimo;
2010

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).
Articolo in rivista - Articolo scientifico
BABAR detector
English
P. del Amo Sanchez et al. (BABAR Collaboration)
Sanchez, P., Lees, J., Poireau, V., Prencipe, E., Tisserand, V., Tico, J., et al. (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) [10.1103/PhysRevD.82.111102].
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