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arXiv · 1002.0893

A study of charged kappa in $J/ψ\to K^{\pm} K_s π^{\mp} π^0$

M. Ablikim
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Abstract

Based on $58 \times 10^6 $ $J/ψ$ events collected by BESII, the decay $J/ψ\to K^{\pm} K_s π^{\mp} π^0$ is studied. In the invariant mass spectrum recoiling against the charged $K^*(892)^{\pm}$, the charged $κ$ particle is found as a low mass enhancement. If a Breit-Wigner function of constant width is used to parameterize the kappa, its pole locates at $(849 \pm 77 ^{+18}_{-14}) -i (256 \pm 40 ^{+46}_{-22})$ MeV/$c^2$. Also in this channel, the decay $J/ψ\to K^*(892)^+ K^*(892)^-$ is observed for the first time. Its branching ratio is $(1.00 \pm 0.19 ^{+0.11}_{-0.32}) \times 10^{-3}$.

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M. Ablikim. 2010-09-02. A study of charged kappa in $J/ψ\to K^{\pm} K_s π^{\mp} π^0$. https://doi.org/10.1016/j.physletb.2010.08.015

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