1205.6809 (V. V. Begun et al.)

Strongly Intensive Measures for Multiplicity Fluctuations    [PDF]

V. V. Begun, V. P. Konchakovski, M. I. Gorenstein, E. Bratkovskaya

The recently proposed two families of strongly intensive measures of fluctuations and correlations $\Delta^{AB}$ and $\Sigma^{AB}$ for extensive physical quantities $A$ and $B$ are studied within Hadron-String-Dynamics transport approach to nucleus-nucleus collisions. We consider the measures $\Delta^{K\pi}$ and $\Sigma^{K\pi}$ for kaon and pion multiplicities in Au+Au collisions in a wide range of collision energies and centralities. The event-by-event fluctuations of the number of nucleon participants strongly contribute to the scaled variances $\omega_\pi$ and $\omega_K$. Already for 10% most central Au+Au collisions the scaled variances, as the measures of particle number fluctuations, become uninformative because of the dominant contribution from the participant number fluctuations. However, the quantities $\Delta^{K\pi}$ and $\Sigma^{K\pi}$ appear to be useful measures of chemical fluctuations in the wide centrality samples of collision events.

View original: http://arxiv.org/abs/1205.6809