Space-dependent probabilities for K0−K0¯ oscillations

Abstract We analyze K 0 - K 0 oscillations in space in terms of propagating wave packets with coherent K S and K L components. The oscillation probabilities P K 0 → K 0 ( x ) and P K 0 → K 0 (x) depending only on the distance x , are defined through the time integration of a current density j ( x , t ). The definition is such that it coincides with the experimental setting, thus avoiding some ambiguities and clarifying some controversies that have been discussed recently.