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Effects of fluctuations on the initial eccentricity from the Color Glass Condensate in heavy ion collisions
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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%.
Forward citations
Cited by 2 Pith papers
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A hydrodynamic-attractor relation between initial-state energy and final charged-particle multiplicity explains the centrality dependence of yields and lets the authors estimate pre-equilibrium energy densities.
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Saturation effects in exclusive vector meson production in DIS
A dense-limit CGC hotspot calculation shows saturation mildly suppresses exclusive vector meson cross sections in ep, with suppression growing at higher color-charge density.
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