v 1 1 4 O ct 1 99 6 HBT Interference , Wigner functions and MC Simulations

A method of MC simulations including quantum interference, proposed recently by A.Krzywicki and the present author, is explained. 1. Introduction. The aim of this talk is to explain details of a scheme for MC simulations of multiparticle production including HBT interference which we proposed recently together with Andrzej Krzywicki [1]. The problem became suddenly of great practical importance, when it was realized that the HBT effects may seriously affect some precise measurements of the standard model parameters [2]. As we have heard yesterday from Krzysztof Fialkowski, the existing implementations of quantum interference into standard MC codes suffer from many problems, theoretical as well as practical ones [3, 4]. Therefore construction of a viable MC code correcly including the interference effects is badly needed. To do this, however, it seems first necessary to formulate the problem and the goals to be achieved. It should perhaps be emphasized at this point that the effects of HBT interference are by no means " trivial " or " automatic " , as it is sometimes believed. On the contrary, they depend in essential way on the physics of the problem. Consequently, there is no single, unique method of implementing the HBT interference into existing codes. One must therefore be careful to spell out the underlying physical assumptions.