Evidence for kappa Meson Production in J/psi -> bar{K}^*(892)^0K^+pi^- Process

Details Evidence for kappa Meson Production in J/psi -> bar{K}^*(892)^0K^+pi^- Process Evidence for kappa Meson Production in J/psi -> bar{K}^*(892)^0K^+pi^- Process

2005-06-24

arxiv.org/abs/hep-ex/0506055v2

Phys.Lett.B633:681-690,2006

Physics

High Energy Physics

High Energy Physics - Experiment

17 pages, 5 figures

Scientific paper

10.1016/j.physletb.2005.12.062

Based on 58 million BESII J/psi events, the bar{K}^*(892)^0K^+pi^- channel in K^+K^-pi^+pi^- is studied. A clear low mass enhancement in the invariant mass spectrum of K^+pi^- is observed. The low mass enhancement does not come from background of other J/psi decay channels, nor from phase space. Two independent partial wave analyses have been performed. Both analyses favor that the low mass enhancement is the kappa, an isospinor scalar resonant state. The average mass and width of the kappa in the two analyses are 878 +- 23^{+64}_{-55} MeV/c^2 and 499 +- 52^{+55}_{-87} MeV/c^2, respectively, corresponding to a pole at (841 +- 30^{+81}_{-73}) - i(309 +- 45^{+48}_{-72}) MeV/c^2.

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