Eta production Resonances, meson couplings

Eta production Resonances, meson couplings

A genuine three-particle scattering effect

Short-range contributions associated to the short-range NN force

• The NN interaction contains an isospin independent scalar exchange component Vs = vs (1-p2/M 2) ...

• The p2/M 2 term can be combined with the kinetic term: M*= M(1+ vs /M) two body correction from scalar and vector exchanges.