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Phys. Rev. D 59, 052003 (1999) [8 pages]

Υ dipion transitions at energies near the Υ(4S)

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S. Glenn et al. (CLEO Collaboration)
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Received 10 August 1998; published 22 January 1999

Using a 4.19fb-1 data sample collected with the CLEO II detector at the Cornell Electron Storage Ring, we have searched for dipion transitions between pairs of Υ resonances at center of mass energies Ec.m.=10.58GeV and Ec.m.=10.52GeV. We obtain the 90% confidence level upper limits B(Υ(4S)→Υ(2S)π+π-)<3.9×10-4 and B(Υ(4S)→Υ(1S)π+π-)<1.2×10-4. We also observe the transitions Υ(3S)→Υ(1S)π+π-, Υ(3S)→Υ(2S)π+π-, and Υ(2S)→Υ(1S)π+π-, from which we measure the cross sections for the radiative processes e+e-Υ(3S)γ and e+e-Υ(2S)γ. We obtain σeeΥ(3S)γ=(17.8±3.0±1.7)pb and σeeΥ(2S)γ=(15.5±1.3±1.4)pb at Ec.m.=10.58GeV, and σeeΥ(3S)γ=(27.3±5.0±2.6)pb and σeeΥ(2S)γ=(16.3±1.8±1.5)pb at Ec.m.=10.52GeV, which we compare with theoretical predictions.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.59.052003
DOI:
10.1103/PhysRevD.59.052003
PACS:
13.25.Gv, 13.65.+i