Study Of Massive Electron Pair Production At The Cern Intersecting Storage-Rings

Data from a study of electron pairs produced in pp collisions (√s = 5 and 63 GeV) are used to extend measurements of the scaling function down to m/√s ≈ 0.07 (4.5 < m < 19 GeV). The dilepton continuum can be described by the scaling formula (fx475-1) The average transverse momentum of dielectrons was found to be 1.43 ± 0.07 GeV, independent of mass (in the range 4.5 < m < 8.7 GeV) and rising with √s. The angular decay distribution of the pairs was measured in the s-channel helicity system and found to behave like 1 + α cos2θ, where α = 1.15 ± 0.34. The angular decay of ϒ at the same energies was found to have α = 0.31 ± 0.35.