Correlations among final-state particles at various pseudorapidity ($ \eta $) values is an important probe to study the underlying mechanism of particle production. Forward-backward correlation is a significant tool to understand the dynamics of multi-particle production as it is believed to be free from final state effects. The forward-backward correlation strength ($ b_{corr} $) has been calculated for multiplicity in backward $(N_{b})$ and forward $(N_{f})$ $ \eta-$intervals as follows: $ b_{corr} [N_{b}, N_{f}]= \frac{ - }{ -^{2}}, $ In the nucleus-nucleus collisions, the volume varies on event-by-event basis and cannot be controlled. Thus, there is a need of quantities which can measure properties of the strongly interacting system independent of volume fluctuations. The strongly intensive quantities are such quantities which are independent of volume as well as volume fluctuations. In Ref. [1,2], two families ($ \Delta $ and $ \Sigma $) of strongly intensive quantities were introduced. In the independent particle production model, where inter-particle correlations are absent, these quantities ($ \Delta $ and $ \Sigma $) are normalized in such a manner that they attain the value of unity. In the absence of any event-by-event fluctuations, the $ \Delta $ and $ \Sigma $ are equal to zero. The strongly intensive variable ($ \Sigma $) has been calculated for two extensive variables i.e., $N_{b}$ and $N_{f}$ as follows: $ \Sigma [N_{b}, N_{f}] = \frac{\omega[{N_{f}}] + \omega[{N_{b}}] -2\left( - \right)} { + }. $ The centrality dependence of these observables has been investigated. The $ b_{corr} [N_{b}, N_{f}] $ has also been studied for different charge combinations. [1] Gorenstein, M. I., and M. Gaździcki, Physical Review C 84.1 (2011): 014904. [2] Gazdzicki, Marek, M. I. Gorenstein, and M. Mackowiak-Pawlowska, Physical Review C 88.2 (2013): 024907.

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XXV DAE-BRNS High Energy Physics Symposium 2022