Quark Counting, Drell-Yan West, and the Pion Wave Function

The relation between the pion's quark distribution function, q (x), its light-front wave function, and the elastic charge form factor, F (²) is explored. The square of the leading-twist pion wave function at a special probe scale, H, is determined using models and Poincare covariance from realistic results for q (x). This wave function is then used to compute form factors with the result that the Drell-Yan-West and quark counting relationships are not satisfied. A new relationship between q (x) and F (²) is proposed.