Produced particle multiplicity dependence on centrality in nucleus-nucleus collisions

An equation is presented, which allows us to calculate the dependence of the multiplicity of the particles produced in nucleus - nucleus collisions, , on an experimentally measured value , which is strongly correlated to the impact parameter b. The equation combines data from a wide range of projectile masses ( - 197) over a large momentum region . The possible meaning of the parameters is discussed in the context of a simple geometrical model.