Renormalization of the Off-shell chiral two-pion exchange NN interactions

Understand

The renormalization, finiteness and off-shellness of short distance power like singular interactions is discussed.

• We show analytically that the renormalizability of the off-shell scattering amplitude relies completely on the corresponding on-shell amplitude without proliferation of new counterterms.
• We illustrate the result by complementary calculations both in coordinate as well as in momentum space in the simplest 1S0 channel for chiral np interactions including Two Pion Exchange.