Direct Photon Production fromπ+pInteractions at 10.5 GeV/c

Abstract
We have studied inclusive photon production from π+p interactions at 10.5 GeV/c and found a source of centrally produced direct photons which accounts for (46±9)% of all photons detected with PL* and PT between 0 and 20 MeV/c. The experimental data are found to be in good agreement with a calculation of hadronic inner bremsstrahlung.