Measurement of branching fractions and CP asymmetries in Λ b 0 Ξ b 0 → p K S 0 h − decays

Abstract

A study of Λ b 0 and Ξ b 0 baryon decays to the final states p K S 0 π − and p K S 0 K − is performed using pp collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb−1. The decays Λ b 0 → p K S 0 K − and Ξ b 0 → p K S 0 K − are observed for the first time, with significances reaching eight standard deviations. The branching fractions and integrated CP asymmetries are measured for the Λ b 0 → p K S 0 π − , Λ b 0 → p K S 0 K − , and Ξ b 0 → p K S 0 K − decays. For the decay Λ b 0 → p K S 0 π − , the CP asymmetries are measured in different regions of the Dalitz plot. No evidence of CP violation is observed.