  Here we discuss two many-particle quantum systems, which are obtained by
adding some nonhermitian but PT (i.e. combined parity and time reversal)
invariant interaction to the Calogero model with and without confining
potential. It is shown that the energy eigenvalues are real for both of these
quantum systems. For the case of extended Calogero model with confining
potential, we obtain discrete bound states satisfying generalised exclusion
statistics. On the other hand, the extended Calogero model without confining
term gives rise to scattering states with continuous spectrum. The scattering
phase shift for this case is determined through the exchange statistics
parameter. We find that, unlike the case of usual Calogero model, the exclusion
and exchange statistics parameter differ from each other in the presence of PT
invariant interaction.
