%0 Journal Article
%T Direct measurement of the pion valence quark momentum distribution, the pion light-cone wave function squared
%A E791 Collaboration
%A E. M. Aitala
%J Physics
%D 2000
%I arXiv
%R 10.1103/PhysRevLett.86.4768
%X We present the first direct measurements of the pion valence quark momentum distribution which is related to the square of the pion light-cone wave function. The measurements were carried out using data on diffractive dissociation of 500 GeV/c $\pi^-$ into di-jets from a platinum target at Fermilab experiment E791. The results show that the $|q\bar {q}>$ light-cone asymptotic wave function, which was developed using perturbative QCD methods, describes the data well for $Q^2 \sim 10 ~{\rm (GeV/c)^2}$ or more. We also measured the transverse momentum distribution of the diffractive di-jets.
%U http://arxiv.org/abs/hep-ex/0010043v1