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Based on 58×106 J/ψ events collected by BESII, the decay J/ψ→K±KSπ∓π0 is studied. In the invariant mass spectrum recoiling against the charged K∗(892)±, the charged κ particle is found as a low mass enhancement. If a Breit–Wigner function of constant width is used to parameterize the κ, its pole locates at (849±77−14+18)−i(256±40−22+46) MeV/c2. Also in this channel, the decay J/ψ→K∗(892)+K∗(892)−...
Based on 58 million BESII J/ψ events, the K¯∗(892)0K+π− channel in K+K−π+π− is studied. A clear low mass enhancement in the invariant mass spectrum of K+π− is observed. The low mass enhancement does not come from background of other J/ψ decay channels, nor from phase space. Two independent partial wave analyses have been performed. Both analyses favor that the low mass enhancement is the κ, an iso-spinor...
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