The experimental results on maximum pseudo-rapidityηmax distribution in the charge exchange processes e+P→e+N+X(X means anything)are discussed.The contributions of reggeon from Regge phenomenology and ofπ^(+)-exchange from pion cloud model are calculated.The results show that neither the Rρ-exchange nor the pion cloud model alone can explain the experimental data well,but after considering these two processes together,by using Monte Carlo simulation,a good agreement between the theoretical results and experimental data is found.
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