Space-Dependent Probabilities for $K^0-\bar{K^0}$ Oscillations
  We analyze $K^0-\bar{K^0}$ oscillations in space in terms of propagating wave packets with coherent $K_S$ and $K_L$ components. The oscillation probabilities $P_{K^0 \to K^0} (x)$ and $P_{K^0 \to \bar{K^0}} (x)$ 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. 
B. Ancochea, A. Bramon, R. Mu\~noz-Tapia and M. Nowakowski