Measurements Of J/Psi Decays Into 2(Pi(+)Pi(-))Eta And 3(Pi(+)Pi(-))Eta

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PHYSICS LETTERS B（2005）

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摘要

Based on a sample of 5.8 x 10(7) J/psi events taken with the BESII detector, the branching fractions of J/psi -> 2(pi(+)pi(-))eta and J/psi -> 3(pi(+)pi(-))eta are measured for the first time to be (2.26 +/- 0.08 +/- 0.27) x 10(-3) and (7.24 +/- 0.96 +/- 1.11) x 10(-4), respectively. (c) 2005 Elsevier B.V. All rights reserved.

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