Transcript スライド 1 - University of Tokyo

Viscous Hydrodynamic Evolution
for the CGC at RHIC and LHC
Akihiko Monnai
Department of Physics, The University of Tokyo
Collaborator: Tetsufumi Hirano
The 17th Heavy Ion Café
March 3rd 2011, The University of Tokyo
Multiplicity at LHC

CGC predictions vs. LHC data
K. Aamodt et al. PRL105 252301
Pb+Pb, 2.76 TeV at η = 0
CGC
ALICE data (most central 0-5%)
The 17th Heavy Ion Café – Open Discussion
Color glass condensate (CGC):
Description of saturated gluons
in nuclei before a collision
Is the CGC not applicable
at LHC?
Akihiko Monnai
Multiplicity at LHC

H. J. Drescher and Y. Nara, PRC 75, 034905
PRC 76, 041903
CGC parameters
Saturation scale in MC-KLN model
λ=0.38
λ=0.18
λ=0.28
Fixed via direct comparison with data
(RHIC data compatible with λ~0.28)

dN/dy
CGC for heavy ion collisions
Initial condition
Initial conditionHydrodynamic
Observed particle
Observed particle
From the CGC
From the CGC evolution distribution distribution
a missing piece!
Is the hydrodynamic effect important ?
The 17th Heavy Ion Café – Open Discussion
Akihiko Monnai
Multiplicity at LHC

AM and T. Hirano,
arXiv:1102.5053 [nucl-th]
Effects of (1+1)D Viscous Hydro
LHC
RHIC
Outward entropy flux
Entropy production
Flattening
Enhancement
If the true λ is larger at RHIC, it enhances dN/dy for LHC;
A possible candidate for explaining the “gap” at LHC?
The 17th Heavy Ion Café – Open Discussion
Akihiko Monnai