Multiplicity Fluctuations in Nucleus-Nucleus Collisions: Dependence on Energy and Atomic Number

Understand

Event-by-event multiplicity fluctuations in central C+C, S+S, In+In, and Pb+Pb as well as p+p collisions at bombarding energies from 10 to 160 AGeV are studied within the HSD and UrQMD microscopic transport approaches.

• Our investigation is directly related to the future experimental program of the NA61 Collaboration at the SPS for a search of the QCD critical point.
• The dependence on energy and atomic mass number of the scaled variances for negative, positive, and all charged hadrons is presented and compared to the results of the model of independent sources.
• Furthermore, the nucleus-nucleus results from the transport calculations are compared to inelastic proton-proton collisions for reference.