Study of dipion bottomonium transitions and search for the hb(1P) state
Abstract
We study inclusive dipion decays using a sample of 108×106Υ(3S) events recorded with the BABAR detector. We search for the decay mode Υ(3S)→π+π-hb(1P) and find no evidence for the bottomonium spin-singlet state hb(1P) in the invariant mass distribution recoiling against the π+π- system. Assuming the hb(1P) mass to be 9.900GeV/c2, we measure the upper limit on the branching fraction B[Υ(3S)→π+π-hb(1P)]<1.2×10-4, at 90% confidence level. We also investigate the χbJ(2P)→π+π-χbJ(1P), Υ(3S)→π+π-Υ(2S), and Υ(2S)→π+π-Υ(1S) dipion transitions and present an improved measurement of the branching fraction of the Υ(3S)→π+π-Υ(2S) decay and of the Υ(3S)-Υ(2S) mass difference.
- Publication:
-
Physical Review D
- Pub Date:
- July 2011
- DOI:
- 10.1103/PhysRevD.84.011104
- arXiv:
- arXiv:1105.4234
- Bibcode:
- 2011PhRvD..84a1104L
- Keywords:
-
- 13.20.Gd;
- 14.40.Pq;
- 14.65.Fy;
- Decays of J/psi Upsilon and other quarkonia;
- Bottom quarks;
- High Energy Physics - Experiment
- E-Print:
- 8 pages, 4 postscript figures