THE EMC EFFECT AT LOW-X IN PERTURBATIVE QCD

The EMC effect is studied in the perturbative QCD hard pomeron approac h. In this framework the nuclear structure function can be expressed d irectly in terms of the proton one. In the limit x --> 0 and for a nuc leus with a constant density the effect is found to be a function of a single variable which combines its x-, Q- and A-dependence. The EMC r atio of the nuclear to nucleon structure functions goes to zero for x --> 0 or/and A much greater than 1. At large Q(2) the effect dies out as ln Q/Q. To describe the present data at 0.005 < x < 0.05 an attempt is made to take into account subasymptotic effects by introducing an anomalous dimension falling with x. This leads to a weaker x- and Q-de pendence, which almost disappears as x grows and the anomalous dimensi on becomes small.