dorsal/arxiv
View SchemaHydrodynamic source with continuous emission in Au+Au collisions at $\sqrt{s}=200$ GeV
| Authors | M. S. Borysova, Yu. M. Sinyukov, S. V. Akkelin, B. Erazmus, Iu. A. Karpenko |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0507057 |
| URL | https://arxiv.org/abs/nucl-th/0507057 |
| DOI | 10.1103/PhysRevC.73.024903 |
| Journal | Phys.Rev. C73 (2006) 024903 |
Abstract
We analyze single particle momentum spectra and interferometry radii in central Au+Au collisions at RHIC within a hydro-inspired parametrization accounting for continuous hadron emission through the whole lifetime of hydrodynamically expanding fireball. We found that a satisfactory description of the data is achieved for a physically reasonable set of parameters when the emission from non space-like sectors of the enclosed freeze-out hypersurface is fairly long: $ 9$ fm/c. This protracted surface emission is compensated in outward interferometry radii by positive $r_{out} - t$ correlations that are the result of an intensive transverse expansion. The main features of the experimental data are reproduced: in particular, the obtained ratio of the outward to sideward interferometry radii is less than unity and decreases with increasing transverse momenta of pion pairs. The extracted value of the temperature of emission from the surface of hydrodynamic tube approximately coincides with one found at chemical freeze-out in RHIC Au+Au collisions. A significant contribution of the surface emission to the spectra and to the correlation functions at relatively large transverse momenta should be taken into account in advanced hydrodynamic models of ultrarelativistic nucleus-nucleus collisions.
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"abstract": "We analyze single particle momentum spectra and interferometry radii in\ncentral Au+Au collisions at RHIC within a hydro-inspired parametrization\naccounting for continuous hadron emission through the whole lifetime of\nhydrodynamically expanding fireball. We found that a satisfactory description\nof the data is achieved for a physically reasonable set of parameters when the\nemission from non space-like sectors of the enclosed freeze-out hypersurface is\nfairly long: $ 9$ fm/c. This protracted surface emission is compensated in\noutward interferometry radii by positive $r_{out} - t$ correlations that are\nthe result of an intensive transverse expansion. The main features of the\nexperimental data are reproduced: in particular, the obtained ratio of the\noutward to sideward interferometry radii is less than unity and decreases with\nincreasing transverse momenta of pion pairs. The extracted value of the\ntemperature of emission from the surface of hydrodynamic tube approximately\ncoincides with one found at chemical freeze-out in RHIC Au+Au collisions.\n A significant contribution of the surface emission to the spectra and to the\ncorrelation functions at relatively large transverse momenta should be taken\ninto account in advanced hydrodynamic models of ultrarelativistic\nnucleus-nucleus collisions.",
"arxiv_id": "nucl-th/0507057",
"authors": [
"M. S. Borysova",
"Yu. M. Sinyukov",
"S. V. Akkelin",
"B. Erazmus",
"Iu. A. Karpenko"
],
"categories": [
"nucl-th",
"hep-ph",
"nucl-ex"
],
"doi": "10.1103/PhysRevC.73.024903",
"journal_ref": "Phys.Rev. C73 (2006) 024903",
"title": "Hydrodynamic source with continuous emission in Au+Au collisions at $\\sqrt{s}=200$ GeV",
"url": "https://arxiv.org/abs/nucl-th/0507057"
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