Nucleon-nucleon scattering in the 1S0 partial wave in the modified Weinberg approach
1 Institut für Theoretische Physik II, Fakultät für Physik und Astronomie, Ruhr-Universität Bochum, 44780 Bochum, Germany
2 SSC RF ITEP, Bolshaya Cheremushkinskaya 25, 117218 Moscow, Russia
3 Tbilisi State University, 0186 Tbilisi, Georgia
a e-mail: firstname.lastname@example.org
Published online: 25 March 2016
Nucleon-nucleon scattering in the 1S0 partial wave is considered in chiral effective field theory within the recently suggested renormalizable formulation based on the Kadyshevsky equation. Contact interactions are taken into account beyond the leading-order approximation. The subleading contact terms are included non-perturbatively by means of subtractive renormalization. The dependence of the phase shifts on the choice of the renormalization condition is discussed. Perturbative inclusion of the subleading contact interaction is found to be justified only very close to threshold. The low-energy theorems are reproduced significantly better compared with the leading order results.
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