Large rapidity gap events and Reggeon in DIS

The experimental results on maximum pseudo-rapidity ηmax distribution in the charge exchange process e + p→e + n + X is discussed. The contributions of Reggeon from Regge phenomenology and π+-exchange from pion cloud model is calculated. The results show that neither the Rρ-exchange nor the pion cloud model alone can explain the experimental data well, but after considering both these two processes together, by using Monte Carlo simulation, a good agreement between theoretical results and experimental data is found