Charged Kaon Interferometric Probes of Space-Time Evolution in Au+Au Collisions at sNN=200GeV

S. Afanasiev et al. (PHENIX Collaboration)
Phys. Rev. Lett. 103, 142301 – Published 30 September 2009

Abstract

Bose-Einstein correlations of charged kaons are used to probe Au+Au collisions at sNN=200GeV 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 of Npart1/3 with a zero intercept. Imaging analysis shows a deviation from a Gaussian tail at r10fm, 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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  • Received 28 March 2009

DOI:https://doi.org/10.1103/PhysRevLett.103.142301

©2009 American Physical Society

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Vol. 103, Iss. 14 — 2 October 2009

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