Strongly Intensive Measures for Multiplicity Fluctuations

Abstract

The recently proposed two families of strongly intensive measures of fluctuations and correlations are studied within Hadron-String-Dynamics (HSD) 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. These strongly intensive measures appear to cancel the participant number fluctuations. This allows to enlarge the centrality window in the analysis of event-by-event fluctuations up to at least of 10% most central collisions. We also present a comparison of the HSD results with the data of NA49 and STAR collaborations. The HSD describes ${\Sigma }^{K\pi }$ reasonably well. However, the HSD results depend monotonously on collision energy and do not reproduce the bump-deep structure of ${\Delta }^{K\pi }$ observed from the NA49 data in the region of the center of mass energy of nucleon pair $\sqrt{s_{NN}}=8÷12$ GeV. This fact deserves further studies. The origin of this `structure' is not connected with simple geometrical or limited acceptance effects, as these effects are taken into account in the HSD simulations.

References in corpus (4)

• Strongly Intensive Quantities
• Onset of deconfinement in nucleus-nucleus collisions: Review for pedestrians and experts
• Multiplicity fluctuations in relativistic nuclear collisions: statistical model versus experimental data
• Multiplicity Fluctuations in Proton-Proton and Nucleus-Nucleus Collisions

Cited by in corpus (7)

• On Normalization of Strongly Intensive Quantities
• Fluctuations as a test of chemical non-equilibrium at the LHC
• Strongly Intensive Measures for Transverse Momentum and Particle Number Fluctuations
• Recent Developments in the Study of Deconfinement in Nucleus-Nucleus Collisions
• Event-by-event fluctuations in p+p and central A+A collisions within relativistic transport models
• Energy and Transverse Momentum Fluctuations in the Equilibrium Quantum Systems
• Pseudorapidity Window Size Dependence of Multiplicity Fluctuations in High-Energy Collisions with System Size and Beam Energies