TL;DR
This paper reviews the properties and behaviors of the quark-gluon medium created in high-energy nucleus collisions, highlighting its collective properties and energy loss mechanisms based on experimental data and theoretical approaches.
Contribution
It provides a comprehensive review of experimental facts and theoretical models describing the quark-gluon medium, emphasizing its collective properties and energy loss phenomena.
Findings
The quark-gluon medium exhibits collective behavior.
Partons lose energy when traversing the medium.
Comparison of nucleus-nucleus and proton-proton collisions reveals medium effects.
Abstract
The properties of the quark-gluon medium observed in high energy nucleus-nucleus collisions are discussed. The main experimental facts about these collisions are briefly described and compared with data about proton-proton collisions. Both microscopic and macroscopic approaches to their description are reviewed. The chromodynamics of the quark-gluon medium at high energies is mainly considered. The energy loss of partons moving in this medium is treated. The principal conclusion is that the medium possesses some collective properties which are crucial for understanding the experimental observations.
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