System size dependence of particle-ratio fluctuations in Pb+Pb collisions at 158$A$ GeV

Abstract

New measurements by the NA49 experiment of the centrality dependence of event-by-event fluctuations of the particle yield ratios (K${}^{+}$+K${}^{-}$)/(${\pi }^{+}+{\pi }^{-}$), (p+$\bar{\text{p}}$)/(${\pi }^{+}+{\pi }^{-}$), and (K${}^{+}$+K${}^{-}$)/(p+$\bar{\text{p}}$) are presented for Pb+Pb collisions at 158$A$ GeV. The absolute values of the dynamical fluctuations of these ratios, quantified by the measure ${\sigma }_{\text{dyn}}$, increase by about a factor of two from central to semi-peripheral collisions. Multiplicity scaling scenarios are tested and found to apply for both the centrality and the previously published energy dependence of the (K${}^{+}$+K${}^{-}$)/(${\pi }^{+}+{\pi }^{-}$) and (p+$\bar{\text{p}}$)/(${\pi }^{+}+{\pi }^{-}$) ratio fluctuations. A description of the centrality and energy dependence of (K${}^{+}$+K${}^{-}$)/(p+$\bar{\text{p}}$) ratio fluctuations by a common scaling prescription is not possible since there is a sign change in the energy dependence.

References in corpus (8)

• From local to critical fluctuations in lattice models: a non-perturbative renormalization-group approach
• K/pi Fluctuations at Relativistic Energies
• System-size and centrality dependence of charged kaon and pion production in nucleus-nucleus collisions at 40A GeV and158A GeV beam energy
• Identity method to study chemical fluctuations in relativistic heavy-ion collisions
• Identity Method for Particle Number Fluctuations and Correlations
• Energy dependence of kaon-to-proton ratio fluctuations in central Pb+Pb collisions from $\sqrt{s_{NN}}$ = 6.3 to 17.3 GeV
• Searching for the QCD Critical Point Using Particle Ratio Fluctuations and Higher Moments of Multiplicity Distributions
• Particle Number Fluctuations and Correlations in Nucleus-Nucleus Collisions

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