A high-statistics (100 000 events) measurement of photoproduction of charged pion pairs on protons is reported in two parts. First, the measured cross sections are presented in a three-dimensional data matrix where all the dynamical features are explicitly shown. Second, fitting the data in the energy region 2.6-6.8 GeV with various assumptions on ρ production indicates that dσdt|ₜ₌₀ for the photoproduction of ρ decreases with increasing energy similar to πN scattering.
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Alvensleben et al. (1969) studied this question.
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