Pseudo-rapidity fluctuations revisited on event-by-event basis- dependence on centrality of collisions

A study of event-by-event pseudo-rapidity fluctuations of the produced shower particles in terms of the values has been carried out for 22Ne-emulsion interactions at 4.1AGeV/c and 28Si-emulsion interactions at 4.5 AGeV/c at different centrality of collision. Depending on the values of the total charges or sum of the charges of non interacting projectile fragments, event samples were classified into four centrality classes. Events having Q=0 have been designated as pure central collision events. Event-by-event pseudo-rapidity fluctuations are found to vary with collision centrality. Event-by-event fluctuations has been found to be minimum for pure central events. In order to extract true dynamical fluctuations experimental results has been compared with the results obtained from the analysis of Monte Carlo simulated (MC-RAND) events.