Abstract

Event-by-event fluctuations of produced particle multiplicities are believed to be sensitive to a deconfinement phase transition and the critical point of strongly interacting matter. The NA49 collaboration has conducted a systematic study of various fluctuation observables. In this contribution, recent results on hadron ratio fluctuations in central Pb+Pb collisions at –17.3 GeV are reported. These results are complemented by the centrality dependence of hadron ratio fluctuations at . A universal scaling was found, describing the energy and centrality dependence of the (K+ + K−)/(π+ + π−) and ratio fluctuations purely by a change in the observed average hadron multiplicities. This scaling is broken for the fluctuations of the and K+/p ratios, possibly hinting at a change in the baryon number–strangeness correlation.

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