Tomasik, Boris and Wiedemann, Urs Achim and Heinz, Ulrich (2003) Reconstructing the freeze-out state in Pb plus Pb collisions at 158 AGeV/c. ACTA PHYSICA HUNGARICA NEW SERIES-HEAVY ION PHYSICS, 17 (1). pp. 105-143. ISSN 1219-7580
Full text not available from this repository.Abstract
For a class of analytical parametrizations of the freeze-out state of relativistic heavy ion collisions, we perform a simultaneous analysis of the single-particle m(perpendicular to)-spectra and two-particle Bose-Einstein correlations measured in central Pb+Pb collisions at the CERN SPS. The analysis includes a full model parameter scan with chi(2) confidence levels. A comparison of different transverse density profiles for the particle emission region allows for a quantitative discussion of possible model dependencies of the results. Our fit results suggest a low thermal freeze-out temperature T approximate to 95 +/- 15 MeV and a large average transverse flow velocity (υ) over bar (perpendicular to) approximate to 0.55 +/- 0.07. Moreover, the fit favours a box-shaped transverse density profile over a Gaussian one. We discuss the origins and the consequences of these results in detail. In order to reproduce the measured pion multiplicity our model requires a positive pion chemical potential. A study of the pion phase-space density indicates mu(pi) approximate to 60MeV for T = 100MeV.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | HEAVY-ION COLLISIONS; BOSE-EINSTEIN CORRELATIONS; TWISS CORRELATION RADII; HIGH-ENERGY COLLISIONS; PHASE-SPACE DENSITY; PB+PB COLLISIONS; PARTICLE INTERFEROMETRY; 2-PARTICLE CORRELATIONS; NUCLEAR COLLISIONS; AU+AU COLLISIONS; freeze-out temperature; transverse flow; m(perpendicular to) spectra; HBT interferometry |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 13 Aug 2021 11:52 |
| Last Modified: | 13 Aug 2021 11:52 |
| URI: | https://pred.uni-regensburg.de/id/eprint/39373 |
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