The chemical equilibration volume: measuring the degree of thermalization

Details The chemical equilibration volume: measuring the degree of thermalization The chemical equilibration volume: measuring the degree of thermalization

2003-05-16

arxiv.org/abs/nucl-th/0305047v1

Phys.Rev. C68 (2003) 044903

Physics

Nuclear Physics

Nuclear Theory

16 pages, 15 figures, revtex4

Scientific paper

10.1103/PhysRevC.68.044903

We address the issue of the degree of equilibrium achieved in a high energy heavy-ion collision. Specifically, we explore the consequences of incomplete strangeness chemical equilibrium. This is achieved over a volume V of the order of the strangeness correlation length and is assumed to be smaller than the freeze-out volume. Probability distributions of strange hadrons emanating from the system are computed for varying sizes of V and simple experimental observables based on these are proposed. Measurements of such observables may be used to estimate V and as a result the degree of strangeness chemical equilibration achieved. This sets a lower bound on the degree of kinetic equilibrium. We also point out that a determination of two-body correlations or second moments of the distributions are not sufficient for this estimation.

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