Effects of periodic matter in kaon regeneration

We study the effects of periodic matter in kaon regeneration, motivated by the possibility of parametric resonance in neutrino oscillations. The large imaginary parts of the forward kaon-nucleon scattering amplitudes and the decay width difference Delta Gamma prevent a sizable enhancement of the K-L --> K-S transition probability. However, some interesting effects can be p roduced using regenerators made of alternating layers of two different mate rials. Despite the fact that the regenerator has a fixed length one can obt ain different values for the probability distribution of the KL decay into a final state. Using a two-arm regenerator set up it is possible to measure the imaginary parts of the K-0((K) over bar (0))-nucleon scattering amplit udes in the correlated decays of the phi -resonance. Combining the data of the single-arm regenerator experiments with direct and reverse orders of th e matter layers in the regenerator one can independently measure the CP vio lating parameter S. (C) 2001 Elsevier Science B.V. All rights reserved.