Isospin violation in the two-nucleon system

Details Isospin violation in the two-nucleon system Isospin violation in the two-nucleon system

1999-03-17

arxiv.org/abs/nucl-th/9903046v2

Physics

Nuclear Physics

Nuclear Theory

16 pp, LaTeX, uses epsfig and sprocl.sty, invited talk, Workshop on Nuclear Physics with Effective Field Theory: 1999, INT Sea

Scientific paper

I discuss isospin violation in an effective field theory appraoch of the nucleon-nucleon interaction. The observed leading order charge independence breaking is explained in terms of one-pion exchange together with a four-nucleon contact term. A general classification scheme of corrections to this leading order results is presented and an explanation is offered why charge-dependent pion-nucleon coupling constants can not play a role in the observed isospin violation in the NN scattering lengths. Charge symmetry breaking, the size of $\pi\gamma$-exchange graphs and the pionless theory are also discussed.

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