CUMULANTS OF QCD MULTIPLICITY DISTRIBUTIONS IN SMALL PHASE-SPACE BINS

It is shown that, as functions of their rank, cumulants of QCD multipl icity distributions in small phase space bins possess quasi-oscillatin g behavior similar to that found for them in the total rapidity range. The first minimum moves to lower ranks for smaller bins. For the tota l rapidity range, it moves to higher ranks with increasing energy. The running property of the QCD coupling constant is in charge of these e ffects, which can be verified in experiment.