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arXiv · 0903.4863

Kaon interferometric probes of space-time evolution in Au+Au collisions at sqrt(s_NN) = 200 GeV

PHENIX Collaboration·S. Afanasiev
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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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PHENIX Collaboration, S. Afanasiev. 2009-03-27. Kaon interferometric probes of space-time evolution in Au+Au collisions at sqrt(s_NN) = 200 GeV. https://doi.org/10.1103/physrevlett.103.142301

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