Beam-energy and system-size dependence of dynamical net charge fluctuations

2008/07/21 by B. I. Abelev, M. M. Aggarwal, Z. Ahammed +372 · 2 citations
Engineering · Mathematics · Physics and Astronomy · #Atomic physics #Beam (structure) #Charge (physics) #Energy (signal processing) #High-Energy Particle Collisions Research #Mathematics #Net (polyhedron) #Optics #Particle Accelerators and Free-Electron Lasers #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #Statistical physics #nucl-ex

paper · pdf · doi:10.1103/physrevc.79.024906

published as Phys.Rev.C79:024906,2009 · 15 pages, 6 figures, STAR Collaboration

arxiv created 2008/07/21 · openalex publication_date 2009/02/25 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We present measurements of net charge fluctuations in Au+Au collisions at √s_NN=19.6, 62.4, 130, and 200 GeV, Cu+Cu collisions at √s_NN=62.4 and 200 GeV, and p+p collisions at √(s)=200 GeV using the dynamical net charge fluctuations measure \ensuremathν_+\ensuremath-,dyn. We observe that the dynamical fluctuations are nonzero at all energies and exhibit a modest dependence on beam energy. A weak system size dependence is also observed. We examine the collision centrality dependence of the net charge fluctuations and find that dynamical net charge fluctuations violate 1/N_ch scaling but display approximate 1/N_part scaling. We also study the azimuthal and rapidity dependence of the net charge correlation strength and observe strong dependence on the azimuthal angular range and pseudorapidity widths integrated to measure the correlation.

Citations

• Charge transfer fluctuations as a signal for quark-gluon plasma
• Clocking Hadronization in Relativistic Heavy-Ion Collisions with Balance Functions
• Transverse radial expansion in nuclear collisions and two particle correlations
• The STAR time projection chamber: a unique tool for studying high multiplicity events at RHIC
• Experimental and theoretical challenges in the search for the quark–gluon plasma: The STAR Collaboration's critical assessment of the evidence from RHIC collisions

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