In certain mild extensions of the standard model, spin-independent long range forces can arise by exchange of two very light pseudoscalar spin-0 bosons. In particular, we have in mind models in which these bosons do not have direct tree level couplings to ordinary fermions. Using the dispersion theoretical method, we find a (Formula presented) behavior of the potential for the exchange of very light pseudoscalars and a (Formula presented) dependence if the pseudoscalars are true massless Goldstone bosons. © 1999 The American Physical Society.
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|Publication status||Published - 4 Mar 1999|