Realistic expanding source model for invariant one particle multiplicity distributions and two particle correlations in relativistic heavy ion collisions
Mar, 199636 pages
Published in:
- Phys.Rev.C 54 (1996) 866-881
e-Print:
- nucl-th/9603007 [nucl-th]
Report number:
- LA-UR-96-0782
Citations per year
Abstract:
We present a realistic expanding source model with nine parameters that are necessary and sufficient to describe the main physics occuring during hydrodynamical freezeout of the excited hadronic matter produced in relativistic heavy-ion collisions. As a first test of the model, we compare it to data from central Si + Au collisions at p_lab/A = 14.6 GeV/c measured in experiment E-802 at the AGS. An overall chi-square per degree of freedom of 1.055 is achieved for a fit to 1416 data points involving invariant pi~+, pi~-, K~+, and K~- one-particle multiplicity distributions and pi~+ and K~+ two-particle correlations. The 99-percent-confidence region of parameter space is identified, leading to one-dimensional error estimates on the nine fitted parameters and other calculated physical quantities. Three of the most important results are the freezeout temperature, longitudinal proper time, and baryon density along the symmetry axis. For these we find values of 92.9 +/- 4.4 MeV, 8.2 +/- 2.2 fm/c, and 0.0222 + 0.0097 / - 0.0069 fm~-3, respectively.Note:
- 36 pages and 12 figures. RevTeX 3.0. Submitted to Physical Review C. Complete preprint, including device-independent (dvi), PostScript, and LaTeX versions of the text, plus PostScript files of all figures, are available at http://t2.lanl.gov/pub/publications/publications.html or at ftp://t2.lanl.gov/pub/publications/resm Report-no: LA-UR-96-0782
- scattering: heavy ion
- heavy ion: scattering
- relativistic
- silicon
- gold
- nuclear reaction: model
- space-time
- model: hydrodynamical
- temperature
- pi: multiple production
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