Schematic representation of the medium temperature dependence of jet transport coefficient in high-energy nucleus-nucleus collisions (IMAGE)
Caption
Relativistic heavy-ion collisions produce a high density of partons with strong final-state interactions and lead to the formation of the quark-gluon plasma (QGP). Experimental evidence at the Relativistic Heavy-Ion Collider (RHIC) and the Large Hadron Collider (LHC) indicates that QGP is a strongly coupled system and can be described well by the relativistic hydrodynamics with a surprisingly small specific shear viscosity. When high-energy partons propagate through the color deconfined QGP medium, they encounter multiple scatterings and lose energy through medium-induced gluon radiation. The strength of the jet energy loss is controlled by the jet transport coefficient (q), which is proportional to the medium gluon number density and is defined as the average transverse momentum broadening squared per unit length for a jet propagating inside the medium. Phenomenological values of the scaled dimensionless q/T3 have been extracted through model-to-data comparisons using hadron suppression data and indicated an additional temperature (T) dependence.
Credit
Han-Zhong Zhang
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License
CC BY-NC