NUCLEAR-DEPENDENCE OF SINGLE-HADRON AND DIHADRON PRODUCTION IN P-A INTERACTIONS AT ROOT-S=38.8 GEV

We present a measurement of the W-to-Be per-nucleon cross-section rati o, R(W/Be), for single hadrons and for opposite-sign hadron pairs prod uced in p-A collisions at root s=38.8 GeV. The data fill in regions of intermediate transverse momentum and dihadron mass that previously ha ve revealed cross-section enhancements for scattering from nuclear tar gets. When combined with previous measurements, the new results help d elineate the dependence of nuclear effects on the kinematic variables p(t), m, and root s. Both the single-hadron and hadron-pair enhancemen ts in R(W/Be) Seen at intermediate values of p(t) and mass decrease wi th increasing root s, consistent with a multiple-scattering model of p arton scattering.