PHENIX measurements of 3D emission source functions in Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV

Details PHENIX measurements of 3D emission source functions in Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV PHENIX measurements of 3D emission source functions in Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV

2008-05-09

arxiv.org/abs/0805.1352v1

J.Phys.G35:104139,2008

Physics

Nuclear Physics

Nuclear Experiment

Proceedings, Quark Matter 2008, Jaipur, India

Scientific paper

10.1088/0954-3899/35/10/104139

A state-of-the-art 3D source imaging technique is used to extract the 3D two-pion source function in central and mid-central Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV. The source function indicates a previously unresolved non-Gaussian tail in the directions of the pion pair transverse momentum (out) and along the beam (long). Model comparisons give robust estimates for several characteristics of the emission source, including its transverse size, its mean proper breakup time $\tau$ and its emission duration $\Delta\tau$. These estimates are incompatible with the predictions for a first order phase transition. However, they point to significant relative emission times which could result from a crossover phase transition.

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