Central Coulomb Effects on Pion Interferometry

Using a simple final-state rescattering model coupled with a simple Coulomb model, the effects of the central Coulomb potential on pion interferometry measurements in 158 GeV/nucleon Pb+Pb collisions are explored. Although the central Coulomb potential does not introduce correlations between pions, it does prevent an accurate measurement of the momentum difference. This momentum difference smearing effect leads to a reduction in the measured correlation radii and lambda parameters. These distortions are important in 158 GeV/nucleon Pb+Pb collisions because of large source sizes and the strong central Coulomb potential.Comment: 6 pages, Latex, 2 postscript figure

Signatures for flow effects in s**(1/2) = 200 GeV proton-proton collisions

A simple model based on relativistic geometry and final-state hadronic rescattering is used to predict pion source parameters extracted in two-pion femtoscopy studies of proton-proton collisions at s**(1/2) = 200 GeV. From studying the momentum and particle multiplicity dependences of these parameters in the context of this model and assuming a very short hadronization time, flow-like behavior is seen which resembles the flow behavior commonly observed in relativistic heavy-ion collisions.Comment: 10 pages, 3 figures, submitted to Physical Revie

Effects of non-causal artifacts in a hadronic rescattering model for RHIC collisions

It has been shown that calculations based on a hadronic rescattering model agree reasonably well with experimental results from RHIC Au+Au collisions. Because of the large particle densities intrinsically present at the early time steps of Monte Carlo calculations attempting to model RHIC collisions undesirable artifacts resulting in non-causality may be present. The effects of such artifacts on observables calculated from the rescattering model are studied in the present work in two ways: 1) varying the time step and 2) using the subdivision method. It is shown that although non-causal artifacts are present in the rescattering model they have no appreciable effects on the calculated observables, thus strengthing the confidence in the results of this rescattering model for RHIC energies.Comment: 14 pages, 8 figure