The reaction yp -p .rr+.rr+.rr-.rr-has been studied in the energy interval 1.5 -12.0 GeV, using the SLAC 40-inch liquid hydrogen bubble chamber exposed to the SLAC annihilation beam. Total and differential cross sections are presented for the reactions y p -A++a+.rr-x, y p -p pO.rr+.rr-and y p -A++po.rr-. The last reaction is analyzed in terms of a double-Regge-exchange model.
Phys. Rev. Lett. 22, 200 (1969). 4 The results are presented for the combined data at 3.9 and 4.6 GeV/c. A similar analysis at each momentum separately shows results which are consistent with those obtained for the total sample. 5 The film coverage is different for the two topologies. 6 ln each figure we indicate the sum of weights as well as the number of events. 7
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