Q^2-evolution of chiral-odd twist-3 distributions h_L(x,Q^2) and e(x, Q^2) in the large N_c limit

Abstract

We prove that the twist-3 chiral-odd parton distributions obey simple GLAP evolution equations in the limit $N_c\to\infty$ and give analytic formulae for the corresponding anomalous dimensions. The results are valid to O(1/N_{c}^2) accuracy and will be useful in confronting with future experiments.