Partial wave analysis of J/ψ → γ(ηπ ⁺ π ^- )

• 摘要：

  A partial wave analysis of BES J/ψ→γ(ηπ ⁺ π ^- ) data has been performed in the mass region 1.1 to 2.0 GeV. A peak is observed due to η(1440) in the ηπ ⁺ π ^- invariant mass distribution; J ^P = 0 ^- is preferred over 1 ⁺ . Its mass is M = 1385 ± 7 MeV and it decays into both ησ and a 0 (980)π, with BR[a 0 (980)π, a 0 →ηπ/ησ] = 0.70 ± 0.12(stat) ± 0.20(syst). Destructive interference between the two decay modes is observed. In addition, in the higher ηπ ⁺ π ^- mass region, there is a definite 2 ^-+ signal, with M = 1840±15 MeV and Γ= 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)π; its mass and width are fitted to be M = 1505 ± 20 MeV and Γ = 130 -20⁺⁵⁰ MeV. © 1999 Elsevier Science B.V. All rights reserved.

• 作者：

  Bai J. Z.;Bian J. G.;Chen G. P.;Chen J. C.;Chen Y.;Chen Y. B.;Chen Y. Q.;Cheng B. S.;Cui X. Z.;Ding H. L.;Dong L. Y.;Du Z. Z.

• 刊名：

  Physics Letters Section B Nuclear Elementary Particle and High Energy Physics

• 在线出版时间：

  1999