Bose-Einstein correlations of {pi}{sup -}{pi}{sup -} pairs in central Pb+Pb collisions at 20A,30A,40A,80A, and 158A GeV

Measurements of Bose-Einstein correlations of {pi}{sup -}{pi}{sup -} pairs in central Pb+Pb collisions were performed with the NA49 detector at the CERN Super Proton Synchroton for beam energies of 20A,30A,40A,80A, and 158A GeV. Correlation functions were measured in the longitudinally comoving ...

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Bibliographic Details
Published in:Physical review. C, Nuclear physics Nuclear physics, 2008-06, Vol.77 (6)
Main Authors: Alt, C., Blume, C., Bramm, R., Dinkelaker, P., Flierl, D., Kliemant, M., Kniege, S., Lungwitz, B., Mitrovski, M., Renfordt, R., Schuster, T., Stock, R., Strabel, C., Stroebele, H., Wetzler, A., Anticic, T., Kadija, K., Nicolic, V., Susa, T., Baatar, B.
Format: Article
Language:English
Subjects:
ATOM-ATOM COLLISIONS
BEAMS
CERN
COLLISIONS
CORRELATION FUNCTIONS
CORRELATIONS
FORECASTING
GEV RANGE
LEAD
NUCLEAR PHYSICS AND RADIATION PHYSICS
PAIRING INTERACTIONS
PARTICLE RAPIDITY
PIONS MINUS
PROTONS
SPECTRA
TRANSVERSE MOMENTUM
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Summary:Measurements of Bose-Einstein correlations of {pi}{sup -}{pi}{sup -} pairs in central Pb+Pb collisions were performed with the NA49 detector at the CERN Super Proton Synchroton for beam energies of 20A,30A,40A,80A, and 158A GeV. Correlation functions were measured in the longitudinally comoving 'out-side-long' reference frame as a function of rapidity and transverse momentum in the forward hemisphere of the reaction. Radius and correlation strength parameters were obtained from fits of a Gaussian parametrization. The results show a decrease of the radius parameters with increasing transverse-momentum characteristic of strong radial flow in the pion source. No striking dependence on pion-pair rapidity or beam energy is observed. Static and dynamic properties of the pion source are obtained from simultaneous fits with a blast-wave model to radius parameters and midrapidity transverse-momentum spectra. Predictions of hydrodynamic and microscopic models of Pb+Pb collisions are discussed.
ISSN:0556-2813
1089-490X
DOI:10.1103/PHYSREVC.77.064908