München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 12: Structure and Dynamics of Nuclei II

HK 12.5: Talk

Monday, March 18, 2019, 17:30–17:45, HS 14

Elastic NN-Scattering with Coupled NΔ-Channels in Chiral Effective Field Theory — •Susanne Strohmeier and Norbert Kaiser — Technische Universität München

We study the elastic nucleon-nucleon scattering (T_lab ≤ 300   MeV) by employing the dynamics of the coupled channels. The potentials arising from one- and two-pion exchange, with iterative contributions properly subtracted, are derived from chiral effective field theory at next-to-leading order. The peripheral phase shifts and mixing angles are compared with the Nijmegen partial wave analysis up to I-waves. The short-range contact interaction in the coupled (NN, NΔ, ΔN, ΔΔ)-channels is constructed up to next-to-leading order (i.e. quadratic in momenta) and the associated low energy constants are determined in fits to empirical NN-scattering phase shifts. We compare solutions of the Kadyshevsky equation with iterative treatments and identify the subset of short-distance parameters with physical significance.
Work supported in part by DFG and NSFC (CRC110).