Prof. Tom Humanic (Ohio State University)
Femtoscopy measures space-time characteristics of the particle emitting source created in relativistic heavy-ion collisions. It is argued that collective behavior of matter (radial flow) produces specific femtoscopic signatures. Some of them, like the mT dependence of the pion "HBT radii" can be explained by the alternative scenario of temperature gradients. We identify the ones that can invalidate such alternatives, such as non-identical particle correlations and mT scaling for particles of higher mass. Studies with a simple rescattering code show that as the interaction cross-section is increased the system develops collective behavior and becomes more thermalized at the same time, the two effects being the natural consequence of increased number of particle rescatterings. Repeating calculations with a more realistic rescattering model confirmed all of these conclusions.
Dr Adam Kisiel (CERN) Prof. Tom Humanic (Ohio State University)