Central Pb+Pb Collisions at 158 A GeV/c Studied by Pion-Pion Interferometry

Details Central Pb+Pb Collisions at 158 A GeV/c Studied by Pion-Pion Interferometry Central Pb+Pb Collisions at 158 A GeV/c Studied by Pion-Pion Interferometry

2000-03-08

arxiv.org/abs/hep-ex/0003009v1

Eur.Phys.J.C16:445-451,2000

Physics

High Energy Physics

High Energy Physics - Experiment

13 pages including 10 figures

Scientific paper

10.1007/s100520000413

Two-particle correlations have been measured for identified negative pions from central 158 AGeV Pb+Pb collisions and fitted radii of about 7 fm in all dimensions have been obtained. A multi-dimensional study of the radii as a function of kT is presented, including a full correction for the resolution effects of the apparatus. The cross term Rout-long of the standard fit in the Longitudinally CoMoving System (LCMS) and the vl parameter of the generalised Yano-Koonin fit are compatible with 0, suggesting that the source undergoes a boost invariant expansion. The shapes of the correlation functions in Qinv and Qspace have been analyzed in detail. They are not Gaussian but better represented by exponentials. As a consequence, fitting Gaussians to these correlation functions may produce different radii depending on the acceptance of the experimental setup used for the measurement.

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