Inclusiveπ−andγProduction in 24 GeV/cppCollisions

Abstract

We report the 24-GeV/c inclusive ${\pi }^{-}$ yield near ${\theta }_{\mathrm{c}.\mathrm{m}.\mathrm{}}=90\mathrm{}°$ for $0.5<~P_T\lesssim 2.2$ GeV/c. No high-$P_T$ excess is seen at this energy. In addition we have obtained the inclusive $\gamma$-ray yield from a measurement of low-mass $e^{+}{e}^{-}$ pairs. This yield is compared with that expected from ${\pi }^0$-, $\eta$-, and $\omega$-meson decay, to provide limits on possible direct photon production.