High transverse mass pion and proton correlations in central PbPb collisions at 17GeV/nucleon

Details High transverse mass pion and proton correlations in central PbPb collisions at 17GeV/nucleon High transverse mass pion and proton correlations in central PbPb collisions at 17GeV/nucleon

2003-05-18

arxiv.org/abs/nucl-ex/0305014v1

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 3 eps figures, revtex4

Scientific paper

For central PbPb collisions at a center of mass energy of 17.3 GeV/nucleon we have made the first two-dimensional measurement of the pp correlation function. These data extend the range of previous studies of HBT radii by a factor of two in transverse mass. They are consistent with a hydrodynamic interpretation and microscopic models that include hadronic rescattering and transverse expansion. We also report new data on pion correlations. The two particle correlations of negative pions at a transverse mass of 0.92 GeV imply source radii that are smaller than typical hydrodynamic fits and transport model simulations. It is possible that these fast pions may have left the source before the build up of hydrodynamic flow.

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