Kinetic description of particle emission from expanding source

Abstract

The freeze out of the expanding systems, created in relativistic heavy ion collisions, is discussed. We combine kinetic freeze out equations with Bjorken type system expansion into a unified model. The important feature of the proposed scenario is that physical freeze out is completely finished in a finite time, which can be varied from 0 (freeze out hypersurface) to infinity. The dependence of the post freeze out distribution function on the freeze out time will be studied. As an example, model is completely solved and analyzed for the gas of pions. We shall see that the basic freeze out features, pointed out in the earlier works, are not smeared out by the expansion of the system. The entropy evolution in such a scenario is also studied.

8 pages, 4 figures. Accepted to Physics Letters B

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Cited by in corpus (4)

• Matching Stages of Heavy Ion Collision Models
• An Initial State with Shear in Peripheral Heavy Ion Collisions
• Pion Mass Shift and the Kinetic Freeze Out Process
• What Can We Learn from Reaction Zone in Relativistic Nucleus-Nucleus Collisions?