A study of charged kappa in $J-ψ o K^{pm} K s π^{mp} π^0$ - High Energy Physics - ExperimentReport as inadecuate




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Abstract: Based on $58 \times 10^6 $ $J-\psi$ events collected by BESII, the decay$J-\psi \to K^{\pm} K s \pi^{\mp} \pi^0$ is studied. In the invariant massspectrum recoiling against the charged $K^*892^{\pm}$, the charged $\kappa$particle is found as a low mass enhancement. If a Breit-Wigner function ofconstant width is used to parameterize the kappa, its pole locates at $849 \pm77 ^{+18} {-14} -i 256 \pm 40 ^{+46} {-22}$ MeV-$c^2$. Also in this channel,the decay $J-\psi \to K^*892^+ K^*892^-$ is observed for the first time.Its branching ratio is $1.00 \pm 0.19 ^{+0.11} {-0.32} \times 10^{-3}$.



Author: M. Ablikim, for the BES collaboration

Source: https://arxiv.org/



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