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Here we discuss two many-particle quantum systems, which are obtained byadding some nonhermitian but PT (i.e. combined parity and time reversal)invariant interaction to the Calogero model with and without confiningpotential. It is shown that the energy eigenvalues are real for both of thesequantum systems. For the case of extended Calogero model with confiningpotential, we obtain discrete bound states satisfying generalised exclusionstatistics. On the other hand, the extended Calogero model without confiningterm gives rise to scattering states with continuous spectrum. The scatteringphase shift for this case is determined through the exchange statisticsparameter. We find that, unlike the case of usual Calogero model, the exclusionand exchange statistics parameter differ from each other in the presence of PTinvariant interaction.Comment: 7 pages, latex, uses czjphys.cls, contributed to the `1st  International Workshop on Pseudo-Hermitian Hamiltonians in Quantum Physics',  Prague, June 16-17, 200

Bound and Scattering States of Extended Calogero Model with an Additional PT Invariant Interaction