Observation of chi(cJ) decays to lambda(Lambda)over-bar pi(+)pi(-)

Abstract

Decays of the chi(cJ) states (J = 0, 1, 2) to Lambda(Lambda) over bar pi(+)pi(-), including processes with intermediate Sigma(1385), are studied through the E1 transition psi(1) -> gamma chi(cJ) using 106 x 10(6) psi(1) events collected with the BESIII detector at BEPCII. This is the first observation of chi(cJ) decays to the final state Lambda(Lambda) over bar pi(+)pi(-). The branching ratio of the intermediate process chi(cJ) -> (Sigma) over bar (1385)(+/-) (Sigma) over bar (1385)(-/+) is also measured for the first time, and the results agree with the theoretical predictions based on the color-octet effect.