The Wilson Renormalisation Group Applied to the Potential in NN   Scattering
  Nonrelativistic two-body scattering by a short-ranged potential is studied using the renormalisation group. Two fixed points are identified: a trivial one and one describing systems with a bound state at zero energy. The eigenvalues of the linearised renormalisation group are used to assign a systematic power-counting to terms in the potential near each of these fixed points. The expansion around the nontrivial fixed point defines a power counting scheme which is equivalent to the effective-range expansion. 
Michael C. Birse, Judith A. McGovern, Keith G. Richardson (University   of Manchester)