Abstract

Inclusive electron and positron emission have been observed for θ cm = 30° and s = 2800 GeV 2 at the CERN Intersecting Storage Rings (ISR). Over the transverse momentum interval 0.2 GeV/ c < p T < 1.5 GeV/ c, electrons and positrons, which are equal in number within the experimental accuracies, appear to grow with respect to other particles (pions) approximately like 1/ p T. We are unable to explain their number and p T-dependence in terms of “conventional” mechanisms.

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