Observation of a threshold enhancement in the p \bar{Lambda} invariant mass spectrum

BES Collaboration, M. Ablikim

An enhancement near the m_p + M_Λ mass threshold is observed in the combined p \barΛ and \bar{p}Λinvariant mass spectrum from J/ψ--> p K^- \bar{Lambda} + c.c. decays. It can be fit…