1 research outputs found
Distribution of valence quarks and light-cone QCD sum rules
A method for calculating the pion structure function directly in terms of
light-cone wave functions is suggested. Taking twist-2 and twist-4 pion
light-cone wave functions into account, it is shown that the QCD sum rule
prediction is in agreement with quark distribution obtained from analysis of
the Drell-Yan process. Twist-4 quark-gluon light-cone wave functions give a
large positive contribution to the pion structure function for x_B<0.2. A new
constraint on the twist-2 pion light-cone wave function is obtained. We argue
that the leading twist pion wave function \phi_\pi(u) \simeq 1 for u=0.3 with
an accuracy of about 20-30%.Comment: 18 pages, Latex, epsfig, 2 figure