Observation of an enhancement in e+e- to Upsilon(1S)pi+pi-, Upsilon(2S)pi+pi-, and Upsilon(3S)pi+pi- production near sqrts=10.89 GeV at Belle

2008/08/31 by The Belle Collaboration, K. -F. Chen, W. -S. Hou · 1 citation
Physics and Astronomy · #hep-ex

paper · pdf · doi:10.1103/physrevd.82.091106

6 pages, 3 figures, Contributed to the 34th International Conference on High Energy Physics, Philadelphia, USA, July 2008; Submit to PRD(RC)

arxiv created 2010/08/23 · arxiv updated 2013/05/29

Abstract

We measure the production cross sections for e+e- -> Upsilon(1S)pi+pi-, Upsilon(2S)pi+pi-, and Upsilon(3S)pi+pi- as a function of sqrts between 10.83 GeV and 11.02 GeV. The data consists of 8.1 fb^-1 collected with the Belle detector at the KEKB e+e- collider. We observe enhanced production in all three final states that does not agree well with the conventional Upsilon(10860) lineshape. A fit using a Breit-Wigner resonance shape yields a peak mass of [10888.4 +2.7/-2.6 (stat) +- 1.2 (syst)] MeV/c² and a width of [30.7 +8.3/-7.0 (stat) +- 3.1 (syst)] MeV/c².

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