Q^2 Evolution of Chiral-Odd Twist-3 Distributions h_L(x, Q^2) and e(x,   Q^2) in Large-N_c QCD
  We prove that the twist-3 chiral-odd parton distributions obey simple Gribov-Lipatov-Altarelli-Parisi evolution equations in the limit $N_c\to\infty$ and give analytic results for the corresponding anomalous dimensions. To this end we introduce an evolution equation for the corresponding three-particle twist-3 parton correlation functions and find an exact analytic solution. For large values of n (operator dimension) we are further able to collect all corrections subleading in N_c, so our final results are valid to $O(1/N_c^2\cdot \ln(n)/n)$ accuracy. 
I.I.Balitsky (MIT), V.M.Braun (NORDITA), Y.Koike (Niigata Univ.) and   K.Tanaka (Juntendo Univ.)