Abstract :
We use standard distorted wave theory techniques and dimensional regularization to find out solutions of the nucleon–nucleon Lippman–Schwinger equation with a potential that includes one-pion exchange and additional contact terms with derivatives. Though for simplicity, we restrict the discussion to the 1S0 channel and to contact terms containing up to two derivatives, the generalization to higher waves and/or number of derivatives is straightforward. The undetermined low energy constants emerging out of the renormalization procedure are fitted to data.
