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Factorial correlators measure the amount of dynamical correlation inmultiplicity between two separated phase-space windows. We present theanalytical derivation of factorial correlators for a QCD jet described at thedouble logarithmic (DL) accuracy. We obtain a new angular scaling property forproperly normalized correlators between two solid-angle cells or two ringsaround the jet axis. Normalized QCD factorial correlators scale with theangular distance and are independent of the window size. Scaling violations areexpected beyond DL approximation, in particular from the subjet structure.Experimental tests are feasible, and thus welcome.Comment: preprint SACLAY-T00-182, TSL/ISV-00-0239; 18 pages, latex, 4 figures;  submitted to Eur. Phys. J.

Factorial correlators: angular scaling within QCD jets