Abstract
The high-energy behaviour of the charge exchange reaction p ̄ p → n ̄ n is analysed within the context of the O(3,1) symmetry formalism. A good fit to the experimental data is obtained if the exchangedparticles are chosen to be ϱ, ϱ′ and A 2. It is found that the dominant contribution of ϱ and A 2 is from the helicity non-flip amplitudes while the contribution of ϱ′ is purely from the helicity flip amplitude.
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