Abstract
Relative yields of negative and positive pions produced from deuterium by a bremsstrahlung beam of maximum energy of 320 MeV have been measured for six pion energies at an angle of 133° (laboratory system). The measured negative to positive pion ratios decreased from 1.42 to 1.19 for mean pion energies of 15.3 and 65.5 MeV respectively. These results are compared with dispersion relation theory and other current theoretical predictions. It is found that experimental photoproduction results show evidence for the existence of a T = 1, J = 1 pion-pion resonance.
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