Observation of charged κ in J/ψ→K⁎(892)∓KSπ±J/ψ→K⁎(892)∓KSπ±, K⁎(892)∓→KSπ∓K⁎(892)∓→KSπ∓ at BESII

Using 58 million J/ψJ/ψ decays obtained by BESII, a charged κ particle is observed in the analysis of the KSπ±KSπ± system recoiling against K⁎(892)∓K⁎(892)∓ selected in J/ψ→KSKSπ+π−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 are in good agreement with those of the neutral κ observed by the BES Collaboration.