Hydrodynamic source with continuous emission in Au+Au collisions at {radical}(s)=200 GeV
- Taras Shevchenko National University, Kiev 01033, Volodymirs'ka 64 (Ukraine)
- Bogolyubov Institute for Theoretical Physics, Kiev 03143, Metrologichna 14b (Ukraine)
- SUBATECH, UMR, Universite, Ecole des Mines, IN2P3/CNRS, 4, rue Alfred Castler, F-44070 Nantes Cedex 03 (France)
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{sub 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.
- OSTI ID:
- 20771287
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 73, Issue 2; Other Information: DOI: 10.1103/PhysRevC.73.024903; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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