Integrability of three-particle evolution equations in QCD
V. M. Braun, S. E. Derkachov, A. N. Manashov
Abstract
We show that Brodsky-Lepage evolution equation for the leading twist spin 3/2 baryon distribution amplitude is completely integrable and reduces to the three-particle XXXs=-1 Heisenberg spin chain. Trajectories of the anomalous dimensions are identified and calculated using the 1/N expansion. Extending this result, we prove integrability of the evolution equations for twist 3 quark-gluon operators in the large Nc limit and derive explicit expressions for the corresponding integrals of motion.
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