Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1999-02-18
Phys.Lett. B461 (1999) 287-294
Physics
Nuclear Physics
Nuclear Theory
11 pp, LaTeX, 2 figures (uses epsfig), dedicated to Walter Gloeckle on the occasion of his 60th birthday
Scientific paper
10.1016/S0370-2693(99)00776-5
We discuss charge symmetry and charge independence breaking in an effective field theory approach for few-nucleon systems. We systematically introduce strong isospin-violating and electromagnetic operators in the theory. The charge dependence observed in the nucleon-nucleon scattering lengths is due to one-pion exchange and one electromagnetic four-nucleon contact term. This gives a parameter free expression for the charge dependence of the corresponding effective ranges, which is in agreement with the rather small and uncertain empirical determinations. We also compare the low energy phase shifts of the $nn$ and the $np$ system.
Epelbaum Evgeny
Meißner Ulf-G.
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