Observation of the Υ(1[superscript 3]DJ) bottomonium state through decays to pi+pi-Υ(1S)

• Main Authors: Cowan, Ray Franklin (Contributor), Dujmic, Denis (Contributor), Fisher, Peter H. (Contributor), Sciolla, Gabriella (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2011-09-14T16:38:39Z.
• Subjects: Article
• Online Access: Get fulltext

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)→γγpi+pi-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 10 164.5±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).
Alfred P. Sloan Foundation
United States. Dept. of Energy
National Science Foundation (U.S.)