Download or read book Deep Inelastic Scattering and Light-cone Wave Functions written by and published by . This book was released on 1996 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the framework of light-cone QCD rules, we study the valence quark distribution function {ital q}({ital x}{sub B}) of a pion for moderate {ital x}{sub B}. The sum rule with the leading twist-2 wave function gives {ital q}({ital x}{sub B}) = [phi]{sub {pi}}({ital x}{sub B}). Twist-4 wave functions give about 30% for {ital x}{sub B} ≈0.5. It is shown that QCD sum rule predictions, with the asymptotic pion wave function, are in good agreement with experimental data. We found that a two-hump profile for the twist-2 wave function leads to a valence quark distribution function that contradicts experimental data.