Renormalization of the chiral pion-nucleon Lagrangian beyond next-to-leading order

The complete renormalization of the generating functional for Green Functio ns of quark currents between one-nucleon states in two-flavor heavy baryon chiral perturbation theory is performed to order q(4). We show how the heat -kernel method must be extended for operators orthogonal to the heavy fermi on four-velocity. We develop a method of treating the multicoincidence limi t arising from insertions of dimension two (and higher) operators on intern al baryon propagators in self-energy graphs. As examples, we study the dive rgences in the isoscalar magnetic moment and the scalar form factor of the nucleon. (C) 2000 Academic Press.