Chiral three pi exchange N N potentials: Results for diagrams proportional to g(A)**4 and g(A)**6
Dec, 1999Citations per year
Abstract:
We calculate in (two-loop) chiral perturbation theory the local NN-potentials generated by the three-pion exchange diagrams proportional to g_A^4 and g_A^6. Surprisingly, we find that the total isoscalar central -exchange potential vanishes identically. The individually largest -exchange potentials are of isoscalar spin-spin, isovector central and isoscalar tensor type. For these potentials simple analytical expressions can be given. The strength of these dominant -exchange potentials at r=1.0 fm is 4.6 MeV, 2.9 MeV and 1.4 MeV, respectively. Furthermore, we observe that the spin-spin and tensor potentials due to the diagrams proportional to g_A^6 do not exist in the infinite nucleon mass limit.- nucleon nucleon: potential
- perturbation theory: chiral
- Feynman graph: higher-order
- exchange: (3pi)
- numerical calculations
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