/ Experiment-Nucl arXiv:0903.4863

Kaon interferometric probes of space-time evolution in Au+Au collisions at s(NN)**(1/2) = 200-GeV

Published in: Phys.Rev.Lett.
Year: 2009
Vol.: 103
Page No: 142301
Pages: 6

Abstract: 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.

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