Abstract
We have measured the production of prompt positrons in pp collisions at √ s = 63 GeV and y = 0 in the p T interval 0.12< p T<1.0 GeV/c. The results indicate that the production of positrons at low p T (<0.4 GeV/ c) is proportional to the square of the mean multiplicity in the central region | y| < 1. Such a quadratic dependence is not expected from final-state sources such as hadronic bremsstrahlung or hadronic decays, but is natural in models where low mass electron pairs are produced by interactions of constituents created during the collision.
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