Evidence of the hc→ KS⁰ K⁺π⁻+c.c. decay

Based on (2.712±0.014)×10⁹ ψ(3686) events collected by the BESIII collaboration, evidence of the hadronic decay hc→ KS⁰K⁺π⁻+c.c. is found with a significance of 4.3σ in the ψ(3686)→π⁰ hc process. The branching fraction of hc→ KS⁰ K⁺π⁻ +c.c. is measured to be (7.3±0.8±1.8)×10⁻⁴, where the first and second uncertainties are statistical and systematic, respectively. Combining with the exclusive decay width of ηc→ KK̄π, our result indicates inconsistencies with both pQCD and NRQCD predictions.