Deciphering 𝚵⁻ capture events in light emulsion nuclei

Racah Institute of Physics, The Hebrew University, Jerusalem 9190401, Israel

^* e-mail: Eliahu.Friedman@mail.huji.ac.il
^** e-mail: avragal@savion.huji.ac.il

Published online: 16 February 2024

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 1p_Ξ¯ nuclear states in a ξ-nuclear potential of nuclear-matter depth V_ξ ≳ 20 MeV [1]. Here we argue that the recently reported ¹⁴N capture events named KINKA and IRRAWADDY are more likely Ξ_1p⁰ - ¹⁴C nuclear states [2] than Ξ_1s^--¹⁴ N states, the latter assignment implying considerably smaller values of V_ξ.