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HK: Fachverband Physik der Hadronen und Kerne

HK 67: Hadron Structure and Spectroscopy 12

HK 67.2: Talk

Thursday, March 26, 2015, 17:30–17:45, T/SR25

Chiral Nucleon-Nucleon Potential: 3π-exchange with virtual Δ-isobar excitations — •Norbert Kaiser — Physik Department T39, Technische Universität München

The status of the chiral nucleon-nucleon potential at order N⁴LO is presented. While the net 3π-exchange at this order is moderate, one finds a sizeable and prevailingly repulsive contribution from the two-loop 2π-exchange, thus compensating the excessive attraction at lower orders. As a result, the phase shifts of the peripheral partial waves are in very good agreement with empirical determinations. The three-pion exchange with excitations of nucleons to virtual Δ-isobars is studied as well. The analytical calculation of the pertinent two-loop spectral functions (by exploiting unitarity) reveals that these mechanisms generate mainly a repulsive isoscalar central NN-potential of moderate size.
D. Entem, N. Kaiser, R. Machleidt and Y. Nosyk, arXiv: 1411.5335.
This work has been supported in part by DFG and NSFC (CRC110).