Pion Production at 12° and 15° in Proton-Beryllium Collisions at 12.5 GeV/c

The results of absolute-cross-section measurements for the production of $\pi$ mesons of 3, 4, and 5 GeV/c in proton-beryllium collisions at 12.5 GeV/c are reported. Measurements were made of ${\pi }^{+}$ and ${\pi }^{-}$ production at 15° to the incident proton direction, and of ${\pi }^{+}$ production at 12°. The production cross sections are about a factor of 2 larger than previously reported measurements.