First observation of the decay $\chi_{cJ}\to \Sigma^{+}\bar{p}K_{S}^{0}+c.c. ~(J = 0, 1, 2)$

Abstract

Using E1 radiative transitions ψ(3686)→γχcJ from a sample of (448.1±2.9)×106ψ(3686) events collected with the BESIII detector, the decays χcJ→Σ+p¯KS0+c.c. (J=0,1,2) are studied. The decay branching fractions are measured to be B(χc0→Σ+p¯KS0+c.c.)=(3.52±0.19±0.21)×10−4, B(χc1→Σ+p¯KS0+c.c.)=(1.53±0.10±0.08)×10−4, and B(χc2→Σ+p¯KS0+c.c.)=(8.25±0.83±0.49)×10−5, where the first and second uncertainties are the statistical and systematic ones, respectively. No evident intermediate resonances are observed in the studied processes.