Does the eikonal approximation for calculating a scattering amplitude in QFT provide the exact result in the limit of $s\rightarrow\infty$ at finite $t=0$ ($s$ and $t$ are the usual Mandelstam variables)?
If so, does it match the answer obtained in the Born approximation in the same limit?
See e.g. Eq. (15-16) of http://arxiv.org/abs/hep-ph/0112161 for an explicit expression of the eikonal approximation.
This post imported from StackExchange Physics at 2014-05-04 11:15 (UCT), posted by SE-user TwoBs