Initial conditions for dipole evolution beyond the McLerran-Venugopalan model
arXiv:1112.4760 · doi:10.1016/j.nuclphysa.2012.02.006
Abstract
We derive the scattering amplitude N(r) for a QCD dipole on a dense target in the semi-classical approximation. We include the first subleading correction in the target thickness arising from ~ρ^4 operators in the effective action for the large-x valence charges. Our result for N(r) can be matched to a phenomenological proton fit by Albacete et al over a broad range of dipole sizes r and provides a definite prediction for the A-dependence for heavy-ion targets. We find a suppression of N(r) for finite A for dipole sizes a few times smaller than the inverse saturation scale, corresponding to a suppression of the classical bremsstrahlung tail.
5 pages plus appendix and references; v2: corrected a few typos, to appear in Nucl. Phys. A
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