Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2009-03-27
Phys.Rev.Lett.103:142301,2009
Physics
Nuclear Physics
Nuclear Experiment
344 authors, 6 pages text, 3 figures, RevTeX 4. Submitted to PRL. Plain text data tables for the points plotted in figures for
Scientific paper
10.1103/PhysRevLett.103.142301
Bose-Einstein correlations of charged kaons are measured for Au+Au collisions at sqrt(s_NN) = 200 GeV and are compared to charged pion probes, which have a larger hadronic scattering cross section. Three dimensional Gaussian source radii are extracted, along with a one-dimensional kaon emission source function. The centrality dependences of the three Gaussian radii are well described by a single linear function if N_part^1/3 with zero intercept. Imaging analysis shows a deviation from a Gaussian tail at r >~ 10 fm, although the bulk emission at lower radius is well-described by a Gaussian. The presence of a non-Gaussian tail in the kaon source reaffirms that the particle emission region in a heavy ion collision is extended, and that similar measurements with pions are not solely due to the decay of long-lived resonances.
Afanasiev S.
PHENIX Collaboration
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