Evidence for a long-range component in the pion emission source in Au+Au   collisions at sqrt(s_NN) = 200 GeV
  Emission source functions are extracted from correlation functions constructed from charged pions produced at mid-rapidity in Au+Au collisions at sqrt(s_NN)=200 GeV. The source parameters extracted from these functions at low k_T, give first indications of a long tail for the pion emission source. The source extension cannot be explained solely by simple kinematic considerations. The possible role of a halo of secondary pions from resonance emissions is explored. 
PHENIX Collaboration, S.S. Adler, et al