Abstract
An introductory overview of electromagnetic probe production in ultra-relativistic heavy ion collisions is provided. Experimental evidence supporting the production of thermal photons and dileptons in heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) are reviewed. Thermal electromagnetic probe production from hydrodynamical models of collisions is discussed.
Highlights
The production of a deconfined nuclear plasma in heavy-ion collisions currently under investigation at Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) provides a window into the many-body properties of Quantum Chromodynamics
The production of a deconfined nuclear plasma in heavy-ion collisions currently under investigation at RHIC and the LHC provides a window into the many-body properties of Quantum Chromodynamics
While multiple uncertainties remain in this picture of the evolution of the deconfined plasma, in particular for the early stage of the collision, the overall success of hydrodynamical models of heavy-ion collisions in describing a wide array of soft hadron measurements suggests that the main features of this picture are credible1
Summary
A number of theoretical studies have shown the sensitivity of thermal electromagnetic probes to the properties of the deconfined nuclear matter produced in heavy-ion collisions To better understand the different sources of photons and dileptons present in heavy-ion collisions, and how they compete with thermal probes in measurements, a brief overview of experimental electromagnetic observables is first provided.
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