Phase-space dependence of particle-ratio fluctuations in Pb+Pb collisions from 20A to 158A GeV beam energy

Abstract

A novel approach, the identity method, was used for particle identification and the study of fluctuations of particle yield ratios in Pb+Pb collisions at the CERN Super Proton Synchrotron (SPS). This procedure allows to unfold the moments of the unknown multiplicity distributions of protons (p), kaons (K), pions ($\pi$) and electrons (e). Using these moments the excitation function of the fluctuation measure ${\nu }_{\text{dyn}}$[A,B] was measured, with A and B denoting different particle types. The obtained energy dependence of ${\nu }_{\text{dyn}}$ agrees with previously published NA49 results on the related measure ${\sigma }_{\text{dyn}}$. Moreover, ${\nu }_{\text{dyn}}$ was found to depend on the phase space coverage for [K,p] and [K,$\pi$] pairs. This feature most likely explains the reported differences between measurements of NA49 and those of STAR in central Au+Au collisions.

References in corpus (5)

• Strongly Intensive Quantities
• Centrality dependence of proton and antiproton spectra in Pb+Pb collisions at 40A GeV and 158A GeV measured at the CERN SPS
• Identity Method for the Determination of the Moments of Multiplicity Distributions
• Identity method to study chemical fluctuations in relativistic heavy-ion collisions
• Energy dependence of kaon-to-proton ratio fluctuations in central Pb+Pb collisions from $\sqrt{s_{NN}}$ = 6.3 to 17.3 GeV

Cited by in corpus (16)

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• Structure formation during phase transitions in strongly interacting matter
• Event-by-Event Identified Particle Ratio Fluctuations in Pb-Pb Collisions with ALICE using the Identity Method
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• Particle-Set Identification method to study multiplicity fluctuations
• Pseudorapidity Window Size Dependence of Multiplicity Fluctuations in High-Energy Collisions with System Size and Beam Energies
• Energy and system size dependence of strongly intensive fluctuation measures in heavy-ion collisions at FAIR energies