NONMONOTONIC TARGET EXCITATION DEPENDENCE OF PION CLANS IN RELATIVISTIC NUCLEUS–NUCLEUS COLLISIONS

Abstract

Target excitation dependence of fluctuation of produced pions (i.e. classifying data of the fluctuation pattern on pions on the basis of the number of gray tracks) is studied for nucleus–nucleus collisions at different projectile energies. In each set the experimental multiplicity distribution is compared with the negative binomial distribution (NBD), which is found to describe the experimental distribution quite well. Target excitation dependence is studied in respect of the clan model parameters [Formula: see text] and [Formula: see text], which are extracted from the NBD fit parameters [Formula: see text] and k. A detailed comparison between different interactions at the same energy and the same interactions at different energies is also drawn. A nonmonotonic dependence of [Formula: see text] on 〈ng〉 is revealed, which is also a characteristic of multiplicity fluctuations at RHIC data.