Eur. Phys. J. A (2015) 51: 71
https://doi.org/10.1140/epja/i2015-15071-6

Regular Article - Theoretical Physics

¹S₀ nucleon-nucleon scattering 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

^* e-mail: jgegelia@hotmail.com

Received: 8 January 2015
Revised: 20 April 2015
Accepted: 19 May 2015
Published online: 25 June 2015

Abstract

Nucleon-nucleon scattering in the ¹ S ₀ partial wave is considered in chiral effective field theory within the renormalizable formulation of a previous work (Phys. Lett. B 716, 338 (2012)) beyond the leading-order approximation. By applying subtractive renormalization, the subleading contact interaction in this channel is taken into account non-perturbatively. For a proper choice of renormalization conditions, the predicted energy dependence of the phase shift and the coefficients in the effective range expansion are found to be in a good agreement with the results of the Nijmegen partial wave analysis.