2000/10/05 by Markus Walzl, Ulf-G. Meißner, Evgeny Epelbaum · 60 citations
Physics and Astronomy · #Bound state #Charge (physics) #Coulomb #Effective field theory #Field (mathematics) #Nuclear physics research studies #Quantum Chromodynamics and Particle Interactions #Quantum and Classical Electrodynamics #Scattering #Scattering theory #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1016/s0375-9474(01)00969-1
published in Nuclear Physics A 693(3-4), 663-692 (Elsevier BV) · 28 pages, 11 figures
arxiv created 2000/10/05 · openalex publication_date 2001/10/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We discuss charge symmetry and charge independence breaking in a chiral effective field theory approach for few-nucleon systems based on a modified Weinberg power counting. We construct a two-nucleon potential with bound and scattering states generated by means of a properly regularized Lippmann-Schwinger equation. We systematically introduce strong isospin-violating and electromagnetic operators in the theory. We use standard procedures to treat the Coulomb potential between two protons in momentum space. We present results for phase shifts in the proton-proton, the neutron-proton and the neutron-neutron systems. We discuss the various contributions to charge dependence and charge symmetry breaking observed in the nucleon-nucleon scattering lengths.