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TMD evolution as a double-scale evolution

Evolution of transverse momentum distributions (TMDs) is given by a pair of equations, which dictates the dependence on scales of rapidity and collinear factorizations. In this way, the evolution of TMDs takes a place in the two-dimension space of scales. It grants unique and non-trivial opportunities to simplify the task of TMD evolution and to disentangle perturbative series entering the TMD cross-section. In this talk, I present recent studies of the structure of double-scale evolution, the zeta-prescription and the definition of optimal TMDs.