Hanbury Brown-Ttiss Correlation Functions from Event Generators: A Reliable Approach to Determine the Size of the Emitting Source in Ultrarelativistic Heavy Ion Collisions?

Details Hanbury Brown-Ttiss Correlation Functions from Event Generators: A Reliable Approach to Determine the Size of the Emitting Source in Ultrarelativistic Heavy Ion Collisions? Hanbury Brown-Ttiss Correlation Functions from Event Generators: A Reliable Approach to Determine the Size of the Emitting Source in Ultrarelativistic Heavy Ion Collisions?

2000-07-20

arxiv.org/abs/nucl-th/0007049v4

Phys.Rev.C65:014901,2002

Physics

Nuclear Physics

Nuclear Theory

Scientific paper

10.1103/PhysRevC.65.014901

Employing NEXUS, one of the most recent simulation programs for heavy ions collisions, we investigate in detail the Hanbury-Twiss correlation function for charged pions for reactions 158 GeV Pb+Pb. For this study we supplement the standard simulation program by electromagnetic interactions. We find that the string fragmentation introduces strong space-momentum correlations and the freeze out times of the correlated pairs have a wide distribution. Both has a strong influence on the apparent source radius determined from the measured correlation correlation function.An equally strong influence is observed for the final state electromagnetic interaction.

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