Altinoluk, TolgaArmesto Pérez, NéstorBeuf, GuillaumeMoscoso Rial, Alexis2018-01-152018-01-152016-03-21Altinoluk, T., Armesto, N., Beuf, G., & Moscoso, A. (2016). CGC beyond eikonal accuracy: finite width target effects. EPJ Web Of Conferences, 112, 02001. http://dx.doi.org/10.1051/epjconf/201611202001http://hdl.handle.net/10347/16325We present a method to systematically include the corrections to the eikonal approximation that are associated with the finite width of the target. The retarded gluon propagator in background field is calculated at next-to-next-to-eikonal (NNE) accuracy by using this method. The corrections to the strict eikonal limit of the gluon propagator are found to be Wilson lines decorated by gradients of the background field of the target. The result is then applied to single inclusive gluon production and to single transverse spin asymmetry for a polarized target in pA collisionseng© Owned by the authors, published by EDP Sciences, 2016. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly citedhttp://creativecommons.org/licenses/by/4.0/journal article10.1051/epjconf/2016112020012100-014Xopen access