Renormalization of the one-pion-exchange interaction

A renormalization scheme for the nucleon-nucleon (NN) interaction based on a subtracted T-matrix equation is proposed and applied to the one-pion-exch ange potential supplemented by contact interactions. The singlet and triple t scattering lengths are given to fix the renormalized strengths of the con tact interactions. With only one scaling parameter (mu), the results show a n overall very good agreement with neutron-proton data, particularly for th e observables related to the triplet channel, The agreement is qualitative in the S-1(0) channel. Between the low-energy NN observables we have examin ed, the mixing parameter of the S-3(1)-D-3(1) states is the most sensitive to the scale. The scheme is renormalization group invariant for mu --> infi nity. (C) 1999 Elsevier Science B.V. All rights reserved.