Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2007-07-30
Phys.Rev.C77:034903,2008
Physics
Nuclear Physics
Nuclear Theory
Accepted for publication, Phys. Rev. C. Arguments considerably expanded, refined and reworded
Scientific paper
10.1103/PhysRevC.77.034903
We introduce a new scenario for heavy ion collisions that could solve the lingering problems associated with the so-called HBT puzzle. We postulate that the system starts expansion as the perfect quark-gluon fluid but close to freeze-out it splits into clusters, due to a sharp rise of bulk viscosity in the vicinity of the hadronization transition. We then argue that the characteristic cluster size is determined by the viscosity coefficient and the expansion rate. Typically it is much smaller and independent of the total system volume. These clusters maintain the pre-existing outward-going flow, as a spray of droplets, but develop no flow of their own, and hadronize by evaporation. We provide an ansatz for converting the hydrodynamic output into clusters.
Mishustin Igor
Tomasik Boris
Torrieri Giorgio
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