Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2006-11-07
Phys.Rev.C75:034905,2007
Physics
Nuclear Physics
Nuclear Theory
9 pages, 10 figures, Updated version as accepted by Phys.Rev.D
Scientific paper
10.1103/PhysRevC.75.034905
We introduce a modified form of the Kharzeev-Levin-Nardi (KLN) approach for nuclear collisions. The new ansatz for the unintegrated gluon distribution function preserves factorization, and the saturation scale is bound from below by that for a single nucleon. It also reproduces the correct scaling with the number of collisions at high transverse momentum. The corresponding Monte Carlo implementation allows us to account for fluctuations of the hard sources (nucleons) in the transverse plane. We compute various definitions of the eccentricity within the new approach, which are relevant for the interpretation of the elliptic flow. Our approach predicts breaking of the scaling of the eccentricity with the Glauber eccentricity at the level of about 30%.
Drescher Hans-Joachim
Nara Yasushi
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