Direct Photon Production fromπ+pInteractions at 10.5 GeV/c

Abstract

We have studied inclusive photon production from ${\ensuremath{\pi}}^{+}p$ interactions at 10.5 GeV/c and found a source of centrally produced direct photons which accounts for (46\ifmmode\pm\else\textpm\fi{}9)% of all photons detected with ${{P}_{L}}^{*}$ and ${P}_{T}$ between 0 and 20 MeV/c. The experimental data are found to be in good agreement with a calculation of hadronic inner bremsstrahlung.