Charged particle production has been measured in deep inelastic scatte
ring (DIS) events over a large range of x and Q(2) using the ZEUS dete
ctor. The evolution of the scaled momentum, x(p), with Q(2), in the ra
nge 10 to 1280 GeV2, has been investigated in the current fragmentatio
n region of the Breit frame. The results show clear evidence, in a sin
gle experiment, for scaling violations in scaled momenta as a function
of Q(2). (C) 1997 Elsevier Science B.V.