Dynamical determination of parton and gluon distributions in quantum chromodynamics

Using the dynamical assumption that at low resolution-energies hadrons consist of valence quarks only, we calculate uniquely nucleonic as well as pionic parton and gluon distributions within the framework of QCD, and give analytic expressions for their x- and Q²-dependence. Applications to dilepton and W-boson Drell-Yan production in pN and πN reactions are illustrated and possible applications to high-p_T processes are discussed.