Photonic measurements of the longitudinal expansion dynamics in Heavy-Ion collisions

Abstract

Due to the smallness of the electromagnetic coupling, photons escape from the hot and dense matter created in an heavy-ion collision at all times, in contrast to hadrons which are predominantly emitted in the final freeze-out phase of the evolving system. Thus, the thermal photon yield carries an imprint from the early evolution. We suggest how this fact can be used to gain information about where between the two limiting cases of Bjorken (boost-invariant expansion) and Landau (complete initial stopping and re-expansion) hydrodynamics the actual evolution can be found. We argue that both the rapidity dependence of the photon yield and photonic HBT radii are capable of answering this question.

10 pages, 3 figures

References in corpus (3)

• A model for the spacetime evolution of heavy-ion collisions at RHIC
• Intensity interferometry of direct photons emitted in Au+Au collisions
• Intensity interferometry of thermal photons from relativistic heavy ion collisions

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• System size and energy dependence of high pT hadron production measured with PHENIX experiment at RHIC