Production of High-Mass Muon Pairis in ${\pi }^{-}$Be Collisions at 150 and 175 GeV/c

This paper presents production and decay characteristics of 500 high-mass, high-resolution ${\mu }^{+}{\mu }^{-}$ pairs produced in ${\pi }^{-}$ Be collisions at 150 and 175 GeV/c. The data do not agree with a simple Drell-Yan production mechanism, but indicate that higher-order quantum-chromodynamic corrections must be included.