Deciphering ${\mathrm{\Xi }}^{-}$ capture events in light emulsion nuclei

We recently showed that all five KEK and J-PARC uniquely assigned two-body ${\mathrm{\Xi }}^{-}$+${}^A$Z$\to {}_{\mathrm{\Lambda }}^{A^{\mathrm{\prime }}}$Z’+${}_{\mathrm{\Lambda }}^{A^{\mathrm{\prime }\mathrm{\prime }}}$Z’’ capture events in CNO light emulsion nuclei are consistent with Coulomb-assisted $1p_{{\mathrm{\Xi }}^{-}}$ nuclear states in a $\mathrm{\Xi }$-nuclear potential of nuclear-matter depth $V_{\mathrm{\Xi }}\gtrsim 20$ MeV [1]. Here we argue that the recently reported ${}^{14}$N capture events named KINKA and IRRAWADDY are more likely $1p_{{\mathrm{\Xi }}^0}$–${}^{14}$C nuclear states [2] than $1s_{{\mathrm{\Xi }}^{-}}$–${}^{14}$N states, the latter assignment implying considerably smaller values of $V_{\mathrm{\Xi }}$.