INCLUSIVE DIELECTRON CROSS-SECTIONS IN P+P AND P+D INTERACTIONS AT BEAM ENERGIES FROM 1.04 TO 4.88 GEV

Measurements of dielectron production in p+p and p+d collisions with b eam kinetic energies from 1.04 to 4.88 GeV are presented. The differen tial cross section is presented as a function of invariant pair mass, transverse momentum, and rapidity. The shapes of the mass spectra and their evolution with beam energy provide information about the relativ e importance of the various dielectron production mechanisms in this e nergy regime. The p+d to p+p ratio of the dielectron yield is also pre sented as a function of invariant pair mass, transverse momentum, and rapidity. The shapes of the transverse momentum and rapidity spectra f rom the p+d and p+p systems are found to be similar to one another for each of the beam energies studied. The beam energy dependence of the integrated cross sections is also presented.