Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2006-05-04
Phys.Rev. C74 (2006) 044905
Physics
Nuclear Physics
Nuclear Theory
8 pages, 7 figures; v3: added note regarding Qs2~n_part versus Qs2~T_A, final version to appear in PRC
Scientific paper
10.1103/PhysRevC.74.044905
The eccentricity in coordinate-space at midrapidity of the overlap zone in high-energy heavy-ion collisions predicted by the $k_\perp$-factorization formalism is generically larger than expected from scaling with the number of participants. We provide a simple qualitative explanation of the effect which shows that it is not caused predominantly by edge effects. We also show that it is quite insensitive to ``details'' of the unintegrated gluon distribution functions such as the presence of leading-twist shadowing and of an extended geometric scaling window. The larger eccentricity increases the azimuthal asymmetry of high transverse momentum particles. Finally, we point out that the longitudinal structure of the Color Glass Condensate initial condition for hydrodynamics away from midrapidity is non-trivial but requires understanding of large-$x$ effects.
Adil Azfar
Drescher Hans-Joachim
Dumitru Adrian
Hayashigaki Arata
Nara Yasushi
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