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Abstract: Femtoscopy measures space-time characteristics of the particle emittingsource created in relativistic heavy-ion collisions. It is argued thatcollective behavior of matter radial flow produces specific femtoscopicsignatures. The one that is best known, the m T dependence of the pion ``HBTradii-, can be explained by the alternative scenario of temperature gradientsin an initial state thermal model. We identify others that can invalidate suchalternatives, such as non-identical particle correlations and m T scaling forparticles of higher mass. Studies with a simple rescattering code show that asthe interaction cross-section is increased the system develops collectivebehavior and becomes more thermalized at the same time, the two effects beingthe natural consequence of increased number of particle rescatterings.Repeating calculations with a more realistic rescattering model confirmed allof these conclusions and provided deeper insight into the mechanisms ofcollectivity buildup, showing a preference for a thermal model with uniformtemperature.



Author: Adam Kisiel, Thomas J. Humanic

Source: https://arxiv.org/







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