Elliptic flow from non-equilibrium initial condition with a saturation scale

A current goal of relativistic heavy-ion collisions experiments is the search for a Color Glass Condensate (CGC) as the limiting state of QCD matter at very high density. In viscous hydrodynamics simulations, a standard Glauber initial condition leads to estimate 4πη/s∼1, while employing the Kharzee...

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Bibliographic Details
Published in:Physics letters. B 2013-11, Vol.727 (1-3), p.177-181
Main Authors: Ruggieri, M., Scardina, F., Plumari, S., Greco, V.
Format: Article
Language:English
Subjects:
Accumulation
Anisotropy
Bolts
Collective flows
Color glass condensate
Computer simulation
Construction
Heavy-ion collisions
Initial conditions
Quantum chromodynamics
Quark–gluon plasma
Searching
Transport theory
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Summary:A current goal of relativistic heavy-ion collisions experiments is the search for a Color Glass Condensate (CGC) as the limiting state of QCD matter at very high density. In viscous hydrodynamics simulations, a standard Glauber initial condition leads to estimate 4πη/s∼1, while employing the Kharzeev–Levin–Nardi (KLN) modeling of the glasma leads to at least a factor of 2 larger η/s. Within a kinetic theory approach based on a relativistic Boltzmann-like transport simulation, our main result is that the out-of-equilibrium initial distribution reduces the efficiency in building-up the elliptic flow. At RHIC energy we find the available data on v2 are in agreement with a 4πη/s∼1 also for KLN initial conditions. More generally, our study shows that the initial non-equilibrium in p-space can have a significant impact on the build-up of anisotropic flow.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2013.10.014