Importance of the Bulk Viscosity of QCD in Ultrarelativistic Heavy-Ion Collisions.
We investigate the consequences of a nonzero bulk viscosity coefficient on the transverse momentum spectra, azimuthal momentum anisotropy, and multiplicity of charged hadrons produced in heavy ion collisions at LHC energies. The agreement between a realistic 3D hybrid simulation and the experimentally measured data considerably improves with the addition of a bulk viscosity coefficient for strongly interacting matter. This paves the way for an eventual quantitative determination of several QCD transport coefficients from the experimental heavy ion and hadron-nucleus collision programs.
Ryu, S; Paquet, J-F; Shen, C; Denicol, GS; Schenke, B; Jeon, S; Gale, C
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