Energy Dependence of Multiplicity Fluctuations in Heavy Ion Collisions at the CERN SPS

Abstract

Multiplicity fluctuations of positively, negatively and all charged hadrons in the forward hemisphere were studied in central Pb+Pb collisions at 20A, 30A, 40A, 80A and 158A GeV. The multiplicity distributions and their scaled variances are presented in dependence of collision energy as well as of rapidity and transverse momentum. The distributions have bell-like shape and their scaled variances are in the range from 0.8 to 1.2 without any significant structure in their energy dependence. No indication of the critical point in fluctuations are observed. The string-hadronic model UrQMD significantly overpredicts the mean, but approximately reproduces the scaled variance of the multiplicity distributions. The predictions of the statistical hadron-resonance gas model obtained within the grand-canonical and canonical ensembles disagree with the measured scaled variances. The narrower than Poissonian multiplicity fluctuations measured in numerous cases may be explained by the impact of conservation laws on fluctuations in relativistic systems.

arXiv comment26 pages, 34 figures, updated version including referee comments

References in corpus (30)

• Experimental and Theoretical Challenges in the Search for the Quark Gluon Plasma: The STAR Collaboration's Critical Assessment of the Evidence from RHIC Collisions
• Formation of dense partonic matter in relativistic nucleus-nucleus collisions at RHIC: Experimental evaluation by the PHENIX collaboration
• Quark Gluon Plasma an Color Glass Condensate at RHIC? The perspective from the BRAHMS experiment
• The PHOBOS Perspective on Discoveries at RHIC
• Microscopic Models for Ultrarelativistic Heavy Ion Collisions
• Relativistic Hadron-Hadron Collisions in the Ultra-Relativistic Quantum Molecular Dynamics Model (UrQMD)
• 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
• Energy and system size dependence of chemical freeze-out in relativistic nuclear collisions
• Pion and kaon production in central Pb+Pb collisions at 20A and 30A GeV: Evidence for the onset of deconfinement
• Universality, the QCD critical/tricritical point and the quark number susceptibility
• Relativistic Transport Approach for Nucleus-Nucleus Collisions from SIS to SPS Energies
• Event-by-event physics in relativistic heavy ion collisions
• Particle Number Fluctuations in Canonical Ensemble
• Report from NA49
• Transverse Momentum Fluctuations in Nuclear Collisions at 158 AGeV
• Fluctuations and Deconfinement Phase Transition in Nucleus-Nucleus 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
• Particle Number Fluctuations in the Microcanonical Ensemble
• Centrality and system size dependence of multiplicity fluctuations in nuclear collisions at 158 AGeV
• Particle Number Fluctuations in High Energy Nucleus-Nucleus Collisions from Microscopic Transport Approaches
• Transparency, Mixing and Reflection of Initial Flows in Relativistic Nuclear Collisions
• Non-monotonic behavior of multiplicity fluctuations
• Transverse momentum versus multiplicity fluctuations in high-energy nuclear collisions
• Multiplicity fluctuations in the string clustering approach
• Searching for the Critical Point of QCD: Theoretical Benchmark Calculations
• Multiplicity Fluctuations in Proton-Proton and Nucleus-Nucleus Collisions
• Possible links between the liquid-gas and deconfinement-hadronization phase transitions
• Multiplicity Fluctuations in Heavy Ion Collisions at CERN SPS

Cited by in corpus (32)

• QCD and strongly coupled gauge theories: challenges and perspectives
• Mapping the Phases of Quantum Chromodynamics with Beam Energy Scan
• Proton number fluctuations in $\sqrt{s_{NN}}$ = 2.4 GeV Au+Au collisions studied with HADES
• Multiplicity fluctuations due to the temperature fluctuations in high-energy nuclear collisions
• Multiplicity and transverse momentum fluctuations in inelastic proton-proton interactions at the CERN Super Proton Synchrotron
• Particlization of an interacting hadron resonance gas with global conservation laws for event-by-event fluctuations in heavy-ion collisions
• The RHIC Beam Energy Scan Program: Results from the PHENIX Experiment
• Large proton cumulants from the superposition of ordinary multiplicity distributions
• Fluctuations of the $K/\pi$ Ratio in Nucleus-Nucleus Collisions: Statistical and Transport Models
• Search for the critical point of strongly interacting matter in NA49
• Hadron yields and fluctuations at the CERN Super Proton Synchrotron: system size dependence from Pb+Pb to p+p collisions
• Correcting event-by-event fluctuations in heavy-ion collisions for exact global conservation laws with the generalized subensemble acceptance method
• Recent Developments in the Study of Deconfinement in Nucleus-Nucleus Collisions
• Measurement of event-by-event transverse momentum and multiplicity fluctuations using strongly intensive measures $\Delta [P_T,N]$ and $\Sigma [P_T,N]$ in nucleus-nucleus collisions at the CERN Super Proton Synchrotron
• Isothermal compressibility of hadronic matter formed in relativistic nuclear collisions
• Fluctuations in Charged Particle Multiplicities in Relativistic Heavy-Ion Collisions
• SPS energy scan results and physics prospects at FAIR
• Fluctuations of the number of participants and binary collisions in AA interactions at fixed centrality in the Glauber approach
• A study of event-by-event fluctuations in relativistic heavy-ion collisions
• Event-by-event fluctuations in p+p and central A+A collisions within relativistic transport models
• Event-By-Event Fluctuation of Maximum Particle Density in Narrow Pseudo-Rapidity Interval at a Few AGeV/c
• Multiplicity Fluctuations and Correlations in Limited Momentum Space Bins in Relativistic Gases
• Generalized nonlinear Langevin equation from quantum nonlinear projection operator
• Particle Production at the SPS and the QCD Phase Diagram
• Measurements of multiplicity fluctuations of identified hadrons in inelastic proton-proton interactions at the CERN Super Proton Synchrotron
• Pseudorapidity Window Size Dependence of Multiplicity Fluctuations in High-Energy Collisions with System Size and Beam Energies
• Statistical Fluctuations and Correlations in Hadronic Equilibrium Systems
• Event-by-event multiplicity fluctuations and correlations in ring-like and jet like events in ${}^{197}$Au-AgBr collisions at 11.6A GeV/c
• Statistical Ensembles With Finite Bath: A Description for an Event Generator
• New results from fluctuation analysis in NA49 at the CERN SPS
• Overview of event-by-event fluctuations
• Accessing proton number fluctuations in limited regions of phase space