Deciphering 𝚵− capture events in light emulsion nuclei

Abstract

Abstract. We recently showed that all five KEK and J-PARC uniquely assigned two-body Ξ- + AZ → A′ΛZ′ + A′′ΛZ′′ capture events in CNO light emulsion nuclei are consistent with Coulomb-assisted 1pΞ¯ nuclear states in a ξ-nuclear potential of nuclear-matter depth Vξ ≳ 20 MeV [1]. Here we argue that the recently reported 14N capture events named KINKA and IRRAWADDY are more likely Ξ1p0 - 14C nuclear states [2] than Ξ1s--14 N states, the latter assignment implying considerably smaller values of Vξ.