Formation of a Ξ-Hypernucleus and Transitions to Double-Λ States

A scenario is given for the formation of ξ − states and the transitions to states with double-Λ in anticipation of observations, especially in the KEK-E224 experiment. First, the production cross sections of ξ − hypernuclear states by (K − , K + ) reactions are calculated within the framework of the distorted-wave impulse approximation. Next, the transition rates from ξ − hypernuclear states to possible double-Λ states are obtained, which are closely related to single- and double-Λ emissions after the ξ − p → ΛΛ conversion in nuclei