Correspondence between HBT radii and the emission zone in non-central heavy ion collisions

Details Correspondence between HBT radii and the emission zone in non-central heavy ion collisions Correspondence between HBT radii and the emission zone in non-central heavy ion collisions

2010-12-29

arxiv.org/abs/1012.5941v1

Phys.Rev.C84:014908,2011

Physics

Nuclear Physics

Nuclear Theory

9 pages, 8 figures

Scientific paper

10.1103/PhysRevC.84.014908

In non-central collisions between ultra-relativistic heavy ions, the freeze-out distribution is anisotropic, and its major longitudinal axis may be tilted away from the beam direction. The shape and orientation of this distribution are particularly interesting, as they provide a snapshot of the evolving source and reflect the space-time aspect of anisotropic flow. Experimentally, this information is extracted by measuring pion HBT radii as a function of angle with respect to the reaction plane. Existing formulae relating the oscillations of the radii and the freezeout anisotropy are in principle only valid for Gaussian sources with no collective flow. With a realistic transport model of the collision, which generates flow and non-Gaussian sources, we find that these formulae approximately reflect the anisotropy of the freezeout distribution.

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