  As a first step toward circumventing the difficulty to obtain an attractive
isospin-independent NN spin-orbit force from Skyrme-type models involving only
pions, we investigate an improved Skyrme Lagrangian that incorporates the
scalar-isoscalar meson \epsilon which can be viewed as the cause behind the
enhancement of the $\pi \pi S$-wave. We find that at large distances, the main
contribution to the spin-orbit potential comes from the scalar Lagrangian and
it is found to be attractive. We briefly discuss how to pursue this work to
finally obtain a medium-range attractive interaction.

High Energy Physics - Phenomenology