Pion-photon exchange nucleon-nucleon potentials

Details Pion-photon exchange nucleon-nucleon potentials Pion-photon exchange nucleon-nucleon potentials

2006-01-31

arxiv.org/abs/nucl-th/0601099v1

Phys.Rev.C73:044001,2006

Physics

Nuclear Physics

Nuclear Theory

7 pages, 2 figures, to be published in Phys. Rev. C (2006) Brief Reports

Scientific paper

10.1103/PhysRevC.73.044001

We calculate in chiral perturbation theory the dominant next-to-leading order correction to the $\pi\gamma$-exchange NN-potential proportional to the large isovector magnetic moment $\kappa_v = 4.7$ of the nucleon. The corresponding spin-spin and tensor potentials $\widetilde V_{S,T}(r)$ in coordinate space have a very simple analytical form. At long distances $r \simeq 2$ fm these potentials are of similar size (but opposite in sign) as the leading order $\pi\gamma$-exchange potentials. We consider also effects from virtual $\Delta$-isobar excitation as well as other isospin-breaking contributions to the $2\pi$-exchange NN-potential induced by additional one-photon exchange.

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