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Multiplicity distributions and event-by-event multiplicity fluctuations inAuAu collisions at energies in future heavy-ion experiment at the Facility forAnti-proton and Ion Research (FAIR) are investigated. Events corresponding toFAIR energies are simulated in the frame work of Ultra Relativistic QuantumMolecular Dynamics (URQMD) model. It is observed that the mean and the width ofmultiplicity distributions monotonically increase with beam energy. The trendof variations of dispersion with mean number of participating nucleons for thecentrality-bin width of 5\% are in accord with the Central Limit Theorem. Themultiplicity distributions in various centrality bins as well as for full eventsamples are observed to obey Koba, Nielsen and Olesen (KNO) scaling. The trendsof variations of scaled variance with beam energy are also found to support theKNO scaling predictions for larger collision centrality. The findings alsoreveal that the statistical fluctuations in 5\% centrality-bin width appear tobe under control.

Centrality Dependence of Multiplicity Fluctuations in Ion-Ion Collisions from the Beam Energy Scan at FAIR