Non-standard neutral kaon dynamics from infinite statistics

The neutral kaon system can be effectively described by non-unitary, dissip ative, completely positive dynamics that extend the usual treatment. In the framework of open quantum systems, we show how the origin of these non-sta ndard time evolutions can be traced to the interaction of the kaon system w ith a large environment. We find that a heat bath of quanta obeying infinit e statistics could constitute a realistic example of such an environment. ( C) 1999 Academic Press.