Rapid change of multiplicity fluctuations in system size dependence at SPS energies

Understand

Recent preliminary results on multiplicity fluctuations in p+p, Be+Be and Ar+Sc collisions from the NA61/SHINE collaboration are presented.

• The scaled variance of charged hadron multiplicity changes little when going from p+p to Be+Be collisions and drops dramatically from Be+Be to Ar+Sc interactions.
• The centrality selection procedure and the influence of volume fluctuations are discussed.
• Comparisons with the EPOS event generator are shown.