Anomalous Production of Direct Electrons at 10, 15, and 24 GeV/c

Abstract

We find significant direct $e^{+}$ production in hadron collisions at 10, 15, and 24 GeV/c and direct $e^{-}$ production at 24 GeV/c, at ${\theta }_{\mathrm{c}.\mathrm{m}.\mathrm{}}=90\mathrm{}°$ at $0.5<~P_T<~1.5$ GeV/c. The $\frac{e}{\pi }$ ratio rises at low $P^T$, and in all cases exceeds the level predicted from known sources for $P_T\lesssim 1$ GeV/c.