Evidence of $κ$ particle in $J/ψ\to \bar{K}^*(892)^0 K^+ π^-$

Bai, J. Z.; Zheng, H. Q.; Ruan, T. N.

Evidence of $κ$ particle in $J/ψ\to \bar{K}^*(892)^0 K^+ π^-$

Authors

Bai, J. Z.

Zheng, H. Q.

Ruan, T. N.

Description

Based on a $J/ψ$ data sample of $7.8 \times 10^6$ events at BESI, the decay of $ J/ψ\to \bar{K}^*(892)^0 K^+ π^-$ is studied and a low mass enhancement, which is believed not coming from the phase space effect or background, is visible in the $K^+ π^-$ invariant mass spectrum recoiling against $\bar{K}^*(892)^0$. Partial wave analysis of this channel favors this low mass enhancement being a broad $0^{+}$ resonance with the mass and width of $771^{+164}_{-221}\pm 55$ MeV/c$^2$ and $220^{+225}_{-169} \pm 97$ MeV/c$^2$, respectively.
4 pages, 4 figures