https://doi.org/10.1140/epja/i2003-10096-0
Improving the convergence of the chiral expansion for nuclear forces - I: Peripheral phases
1
Institut für Theoretische Physik II, Ruhr-Universität Bochum, D-44870, Bochum, Germany
2
Helmholtz-Institut für Strahlen- und Kernphysik (Theorie), Universität Bonn, Nußallee 14-16, D-53115, Bonn, Germany
3
Institut für Kernphysik (Theorie), Forschungszentrum Jülich, D-52425, Jülich, Germany
* e-mail: evgeni.epelbaum@tp2.ruhr-uni-bochum.de
We study the two-pion exchange potential at next-to-next-to-leading order in chiral effective field theory. We propose a new cut-off scheme for the pion loop integrals based on spectral-function regularization. We show that this method allows for a consistent implementation of constraints from pion-nucleon scattering. It leads to a much improved description of the partial waves with angular momentum 
as compared to the calculation utilizing dimensional regularization.
© Società Italiana di Fisica and Springer-Verlag, 2004
