ψ'->pK+∑0 和χcJ->pK+Lambda过程的测量

Using a sample of 1.06*10^8ψ^prime mesons collected with the BESIII detector at the BEPCII e+e^- collider and χ_{cJ} mesons produced via radiative transitions from the ψ^prime, we report the first observation for $ψ^prime->bar{p}K+Sigma^0+c.c. (charge-conjugate), as well as improved measurements for the χ_{cJ} hyperon decaysχ_{cJ}->bar{p}K+Lambda+c.c.$. The branching fractions are measured to be mathcal{B}(ψ^prime->bar{p}K+Sigma^0+c.c)=(1.7pm0.1pm0.1)*10^{-5}, mathcal{B}(χ_{c0}->bar{p}K+λ+c.c.)=(13.2pm0.3pm1.0)*0^{-4}$, mathcal{B}(χ_{c1}->bar{p}K+λ+c.c.)=(4.5pm0.2pm0.4)*10^{-4}$ and mathcal{B}(χ_{c2}->bar{p}K+λ+c.c.)=(8.4pm0.3pm0.6)*10^{-4}$, where the first error is statistical, and the second is systematic. In the decay of χ_{c0}->bar{p}K+λ+c.c.,an anomalous enhancement near threshold is observed in the invariant mass distribution of bar{p}λ+c.c., which cannot be explained by phase space, and may be related to other such structures observed before.