Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1995-08-24
Phys.Rev.C53:918-931,1996
Physics
Nuclear Physics
Nuclear Theory
34 pages, 3 Postscript figures, RevTeX
Scientific paper
10.1103/PhysRevC.53.918
The transverse momentum dependence of Hanbury-Brown/Twiss (HBT) interferometry radii for 2-body correlation functions provides experimental access to the collective dynamics in heavy-ion collisions. We present an analytical approximation scheme for these HBT radii which combines the recently derived model-independent expressions with an approximate determination of the saddle point of the emission function. The method is illustrated for a longitudinally boost-invariant hydrodynamical model of a heavy ion collision with freeze-out on a sharp hypersurface. The analytical approximation converges rapidly to the width of the numerically computed correlation function and reproduces correctly its exact transverse momentum dependence. However, higher order corrections within our approximation scheme are essential, and the previously published lowest order results with simple $m_{\perp}$ scaling behaviour are quantitatively and qualitatively unreliable.
Heinz Ulrich
Scotto Pierre
Wiedemann Urs Achim
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