Abstract
We present a new method to systematically include corrections to the eikonal approximation in the background field formalism. Specifically, we calculate the subleading, power-suppressed corrections due to the finite width of the target or the finite energy of the projectile. Such power-suppressed corrections involve Wilson lines decorated by gradients of the background field — thus related to the density - of the target. The method is of generic applicability. As a first example, we study single inclusive gluon production in pA collisions, and various related spin asymmetries, beyond the eikonal accuracy.
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Altinoluk, T., Armesto, N., Beuf, G. et al. Next-to-eikonal corrections in the CGC: gluon production and spin asymmetries in pA collisions. J. High Energ. Phys. 2014, 68 (2014). https://doi.org/10.1007/JHEP07(2014)068
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DOI: https://doi.org/10.1007/JHEP07(2014)068