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Observation of Anomalous Υ(1S)π+π and Υ(2S)π+π Production near the Υ(5S) Resonance

K.-F. Chen et al. (Belle Collaboration)
Phys. Rev. Lett. 100, 112001 – Published 17 March 2008

Abstract

We report the first observation of e+eΥ(1S)π+π, Υ(2S)π+π, and first evidence for e+eΥ(3S)π+π, Υ(1S)K+K, near the peak of the Υ(5S) resonance at s10.87GeV. The results are based on a data sample of 21.7fb1 collected with the Belle detector at the KEKB e+e collider. Attributing the signals to the Υ(5S) resonance, the partial widths Γ(Υ(5S)Υ(1S)π+π)=0.59±0.04(stat)±0.09(syst)MeV and Γ(Υ(5S)Υ(2S)π+π)=0.85±0.07(stat)±0.16(syst)MeV are obtained from the observed cross sections. These values exceed by more than 2 orders of magnitude the previously measured partial widths for dipion transitions between lower Υ resonances.

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  • Received 17 December 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.112001

©2008 American Physical Society

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Vol. 100, Iss. 11 — 21 March 2008

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