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Partial wave analysis of J/Ψ→γ(ηπ+π-)
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DOI：10.1016/S0370-2693(98)01445-2.png)
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Abstract
En 中文
A partial wave analysis of BES J/psi --> gamma(eta pi(+)pi(-)) data has been performed in the mass region 1.1 to 2.0 GeV. A peak is observed due to eta(1440) in the eta pi(+)pi(-) invariant mass distribution; J(P) = 0(-) is preferred over li. Its mass is M = 1385 +/- 7 MeV and it decays into both eta sigma and a(0)(980)pi, with BR[a(0)(980)pi, a(0) --> eta pi/eta sigma] = 0.70 +/- 0.12(stat) +/- 0.20(syst). Destructive interference between the two decay modes is observed. In addition, in the higher eta pi(+)pi(-) mass region, there is a definite 2(-+) signal, with M = 1840 +/- 15 MeV and Gamma = 170 +/- 40 MeV and an additional 0(-+) signal at 1760 +/- 35 MeV. We also find a possible contribution from a 1(++) signal decaying dominantly through a(0)(980)pi; its mass and width are fitted to be M = 1505 +/- 20 MeV and Gamma = 130(-20)(+50) MeV. (C) 1999 Elsevier Science B.V. All rights reserved.
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