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Using 58 million J/ψ decays obtained by BESII, a charged κ particle is observed in the analysis of the KSπ± system recoiling against K⁎(892)∓ selected in J/ψ→KSKSπ+π−. The mass and width values of the charged κ are obtained to be (826±49−34+49) MeV/c2 and (449±156−81+144) MeV/c2 for the Breit–Wigner parameters, and the pole position is determined to be (764±63−54+71)−i(306±149−85+143) MeV/c2. They...
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)−...
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