dorsal/arxiv
View SchemaWhat Invariant One-Particle Multiplicity Distributions and Two-Particle Correlations Are Telling Us about Relativistic Heavy-Ion Collisions
| Authors | J. Rayford Nix, Daniel Strottman, Hubert W. van Hecke, Bernd R. Schlei, John P. Sullivan, Michael J. Murray |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9801045 |
| URL | https://arxiv.org/abs/nucl-th/9801045 |
Abstract
We use a nine-parameter expanding source model that includes special relativity, quantum statistics, resonance decays, and freeze-out on a realistic hypersurface in spacetime to analyze invariant pi+, K+, and K- one-particle multiplicity distributions and pi+ and pi- two-particle correlations in nearly central collisions of Pb + Pb at a laboratory bombarding momentum per nucleon of 158 GeV/c. The adjustable parameters of the model are determined by minimizing chi-square with a total of 2137 data points for the five types of data considered, which leads to an acceptable value of 1.017 for chi-square per degree of freedom. Compared to earlier results obtained with this model for nearly central collisions of Si + Au at a laboratory bombarding momentum per nucleon of 14.6 GeV/c, the present results indicate that in Pb + Pb collisions the freeze-out density is somewhat lower, the freeze-out temperature is slightly higher, the source at freeze-out is somewhat larger, and the longitudinal collective velocity is very poorly determined (because of the limited experimental coverage in rapidity). For both reactions, the freeze-out temperature is less than 100 MeV and the longitudinal and transverse collective velocities-which are anti-correlated with the temperature-are substantial. We reconcile these results with those in several previous analyses that yielded a much higher freeze-out temperature of approximately 140 MeV, and finally perform two additional studies with our expanding source model.
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"abstract": "We use a nine-parameter expanding source model that includes special\nrelativity, quantum statistics, resonance decays, and freeze-out on a realistic\nhypersurface in spacetime to analyze invariant pi+, K+, and K- one-particle\nmultiplicity distributions and pi+ and pi- two-particle correlations in nearly\ncentral collisions of Pb + Pb at a laboratory bombarding momentum per nucleon\nof 158 GeV/c. The adjustable parameters of the model are determined by\nminimizing chi-square with a total of 2137 data points for the five types of\ndata considered, which leads to an acceptable value of 1.017 for chi-square per\ndegree of freedom. Compared to earlier results obtained with this model for\nnearly central collisions of Si + Au at a laboratory bombarding momentum per\nnucleon of 14.6 GeV/c, the present results indicate that in Pb + Pb collisions\nthe freeze-out density is somewhat lower, the freeze-out temperature is\nslightly higher, the source at freeze-out is somewhat larger, and the\nlongitudinal collective velocity is very poorly determined (because of the\nlimited experimental coverage in rapidity). For both reactions, the freeze-out\ntemperature is less than 100 MeV and the longitudinal and transverse collective\nvelocities-which are anti-correlated with the temperature-are substantial. We\nreconcile these results with those in several previous analyses that yielded a\nmuch higher freeze-out temperature of approximately 140 MeV, and finally\nperform two additional studies with our expanding source model.",
"arxiv_id": "nucl-th/9801045",
"authors": [
"J. Rayford Nix",
"Daniel Strottman",
"Hubert W. van Hecke",
"Bernd R. Schlei",
"John P. Sullivan",
"Michael J. Murray"
],
"categories": [
"nucl-th"
],
"title": "What Invariant One-Particle Multiplicity Distributions and Two-Particle Correlations Are Telling Us about Relativistic Heavy-Ion Collisions",
"url": "https://arxiv.org/abs/nucl-th/9801045"
},
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