Can we extract lambda-lambda interaction from two-particle momentum correlation? Original Research Article

We analyze the invariant mass spectrum of Λ-Λ in 12C(K−, K+ΛΛ) reaction at PK− = 1.65 GeV/c by using a combined framework of IntraNuclear Cascade (INC) model and the correlation function technique. The observed enhancement at low-invariant masses can be well reproduced with attractive Λ-Λ interactions with the scattering length either in the range a = −6 ∼ −4 fm (no bound state) or a = 7 ∼ 12 fm (with bound state). We also discuss Λ-Λ correlation functions in central relativistic heavy-ion collisions as a possible way to eliminate this discrete ambiguity.