Jouw zelfde wikipedia:
"The Standard Model of particle physicspredicts a tiny separation of positive and negative charge within the neutron leading to a permanentelectric dipole moment. The predicted value is, however, well below the current sensitivity of experiments. From severalunsolved puzzles in particle physics, it is clear that the Standard Model is not the final and full description of all particles and their interactions. New theories goingbeyond the Standard Modelgenerally lead to much larger predictions for the electric dipole moment of the neutron. Currently, there are at least four experiments trying to measure for the first time a finite neutron electric dipole moment."
Zie deze wiki pagina eens: http://en.wikipedia.org/wiki/Neutron_electric_dipole_moment