Multiplicity Fluctuations in Proton-Proton and Nucleus-Nucleus Collisions

Abstract

We study the scaled variances of multiplicity fluctuations in nucleus-nucleus collisions at SPS and RHIC energies within the HSD transport model. The HSD results are compared with proton-proton data and with predictions of the hadron-resonance gas statistical model. We find that the HSD scaled variances ${\omega }_i$ for negatively, positively, and all charged hadrons in central nucleus-nucleus collisions remain close to the ${\omega }_i$ values in proton-proton collisions and increase with collision energy as the corresponding multiplicities per participating nucleon. The statistical model predicts very different behavior of ${\omega }_i$. However, a comparison with preliminary NA49 data for the most central Pb+Pb collisions at SPS energies does not permit to distinguish the HSD and statistical model results. New measurements of the multiplicity fluctuations in nucleus-nucleus collisions in a wide energy region with large acceptance are needed to allow for a proper determination of the underlying dynamics.

9 pages, 4 figures, Phys. Lett. B, in press

References in corpus (39)

• Signatures of the Tricritical Point in QCD
• Event-by-Event Fluctuations in Heavy Ion Collisions and the QCD Critical Point
• Energy Dependence of Pion and Kaon Production in Central Pb+Pb Collisions
• Relativistic Transport Approach for Nucleus-Nucleus Collisions from SIS to SPS Energies
• Event-by-event physics in relativistic heavy ion collisions
• Strangeness dynamics and transverse pressure in relativistic nucleus-nucleus collisions
• Event-by-event fluctuations of average transverse momentum in central Pb+Pb collisions at 158 GeV per nucleon
• Event-by-event fluctuations of the mean transverse momentum in 40, 80, and 158 A GeV/c Pb-Au collisions
• Particle Number Fluctuations in Canonical Ensemble
• Excitation functions of hadronic observables from SIS to RHIC energies
• Multiplicity fluctuations in Au+Au collisions at $\sqrt{s_{NN}}=130$ GeV
• Open charm and charmonium production at relativistic energies
• Measurement of Non-Random Event-by-Event Fluctuations of Average Transverse Momentum in sqrt(s_NN)=200 GeV Au+Au and p+p Collisions
• Transverse Momentum Fluctuations in Nuclear Collisions at 158 AGeV
• Non-Equilibrium Phase Transition in Rapidly Expanding Matter
• Event-by-event fluctuations of the kaon to pion ratio in central Pb+Pb collisions at 158 GeV per Nucleon
• Hadronic observables from SIS to SPS energies - anything strange with strangeness ?
• Event-wise mean p_t fluctuations in Au-Au collisions at sqrt{s_{NN}} = 130 GeV
• Fluctuations and Deconfinement Phase Transition in Nucleus-Nucleus Collisions
• Anomalous Multiplicity Fluctuations from Phase Transitions in Heavy Ion Collisions
• Multiplicity fluctuations in relativistic nuclear collisions: statistical model versus experimental data
• Event-by-Event Fluctuations in Particle Multiplicities and Transverse Energy Produced in 158.A GeV Pb+Pb collisions
• Fluctuations of Strangeness and Deconfinement Phase Transition in Nucleus-Nucleus Collisions
• Event-by-Event Fluctuations of Particle Ratios in Central Pb+Pb Collisions at 20 to 158 AGeV
• Particle Number Fluctuations in the Microcanonical Ensemble
• Particle Number Fluctuations in High Energy Nucleus-Nucleus Collisions from Microscopic Transport Approaches
• Fluctuations in the Canonical Ensemble
• Transparency, Mixing and Reflection of Initial Flows in Relativistic Nuclear Collisions
• Probability distributions in statistical ensembles with conserved charges
• Non-monotonic behavior of multiplicity fluctuations
• Multiplicity fluctuations in the hadron gas with exact conservation laws
• Particle Number Fluctuations in Statistical Model with Exact Charge Conservation Laws
• Event-by-Event Fluctuations
• Baryon Number and Electric Charge Fluctuations in Pb+Pb Collisions at SPS energies
• Thermodynamic limit and semi--intensive quantities
• Analysis of Dynamic Multiplicity Fluctuations at PHOBOS
• Fluctuation Results from PHENIX
• Charged hadron transverse momentum distributions in Au+Au collisions at sqrt(s_NN) = 200 GeV
• Energy Dependence of Multiplicity Fluctuations in Heavy Ion Collisions

Cited by in corpus (12)

• Energy Dependence of Multiplicity Fluctuations in Heavy Ion Collisions at the CERN SPS
• Fluctuations of the $K/\pi$ Ratio in Nucleus-Nucleus Collisions: Statistical and Transport Models
• Binomial acceptance corrections for particle number distributions in high-energy reactions
• Hadron yields and fluctuations at the CERN Super Proton Synchrotron: system size dependence from Pb+Pb to p+p collisions
• Searching for the Critical Point of QCD: Theoretical Benchmark Calculations
• Multiplicity Fluctuations in Nucleus-Nucleus Collisions: Dependence on Energy and Atomic Number
• Multiplicity Fluctuations in Limited Segments of Momentum Space in Statistical Models
• Energy dependence of fluctuations in central Pb+Pb collisions from NA49 at the CERN SPS
• Multiplicity Fluctuations in Au+Au Collisions at RHIC
• Strongly Intensive Measures for Multiplicity Fluctuations
• Multiplicity fluctuations in relativistic nuclear collisions
• $K/\pi$, $K/p$ and $p/\pi$ Ratio Fluctuations within the HSD Transport Approach