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Reconstructing the freeze-out state in Pb+Pb collisions at 158 AGeV/c
Title Reconstructing the freeze-out state in Pb+Pb collisions at 158 AGeV/c Author info Boris Tomášik, Urs Achim Wiedemann, Ulrich Heinz Author Tomášik Boris 1972- (34%)
Co-authors Wiedemann Urs Achim (33%)
Heinz Ulrich (33%)
Source document Acta physica Hungarica : heavy ion physics. Vol. 17, no. 1 (2003), pp. 105-143. - Budapest : Akademiai Kiado, 2003 Keywords heavy ion collisions nukleárne kolízie - nuclear collisions Language English Country Hungary systematics 53 Annotation For a class of analytical parametrizations of the freeze-out state of relativistic heavy ion collisions, we perform a simultaneous analysis of the single-particle m(perpendicular to)-spectra and two-particle Bose-Einstein correlations measured in central Pb+Pb collisions at the CERN SPS. The analysis includes a full model parameter scan with chi(2) confidence levels. A comparison of different transverse density profiles for the particle emission region allows for a quantitative discussion of possible model dependencies of the results. Our fit results suggest a low thermal freeze-out temperature T approximate to 95 +/- 15 MeV and a large average transverse flow velocity (υ) over bar (perpendicular to) approximate to 0.55 +/- 0.07. Moreover, the fit favours a box-shaped transverse density profile over a Gaussian one. We discuss the origins and the consequences of these results in detail. In order to reproduce the measured pion multiplicity our model requires a positive pion chemical potential. A study of the pion phase-space density indicates mu(pi) approximate to 60MeV for T = 100MeV. URL http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS&DestLinkType=FullRecord&UT=WOS:000181859200012 Public work category ADC No. of Archival Copy 6308 Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xpca - PUBLIKAČNÁ ČINNOSŤ 
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Number of the records: 1