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Charge symmetry breaking of the nucleon-nucleon interaction: ρ-ω mixing versus nucleon mass splitting

R. Machleidt1,* and H. Müther2,†

  • 1Department of Physics, University of Idaho, Moscow, Idaho 83844
  • 2Institut für Theoretische Physik, Universität Tübingen, D-72076 Tübingen, Germany

  • *Electronic address: machleid@uidaho.edu
  • Electronic address: herbert.muether@uni-tuebingen.de

Phys. Rev. C 63, 034005 – Published 22 February, 2001

DOI: https://doi.org/10.1103/PhysRevC.63.034005

Abstract

We investigate three models for the charge symmetry breaking (CSB) of the nucleon-nucleon (NN) interaction (based upon ρω mixing, nucleon mass splitting, and phenomenology) that all reproduce the empirical value for the CSB of the 1S0 scattering length (ΔaCSB) accurately. We reveal that these models make very different predictions for CSB in 3PJ waves and examine the impact of this on some observable quantities of A>~3 nuclear systems. It turns out that the 3H3He binding energy difference is essentially ruled by ΔaCSB and not very sensitive to CSB from P waves. However, the Coulomb displacement energies (which are the subject of the Nolen-Schiffer anomaly) receive about 50% of their CSB contribution from NN partial waves beyond 1S0. Consequently, the predictions by the various CSB models differ here substantially (10%–20%). Unfortunately, the evaluation of the leading Coulomb contributions carries a large uncertainty such that no discrimination between the competing CSB models can presently be made. To decide the issue we suggest looking into nuclear few-body reactions that are sensitive to CSB of the nuclear force.

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