2011/12/31 by В.Д. Тонеев, V. D. Toneev, V. Voronyuk +5 · 31 citations
Physics and Astronomy · #Astrophysics #Energy (signal processing) #Hadron #High-Energy Particle Collisions Research #Nuclear physics #Parity (physics) #Particle physics #Particle physics theoretical and experimental studies #Parton #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #Star (game theory) #hep-ex #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1103/physrevc.85.034910
published in Physical Review C 85(3) (American Institute of Physics) · 6pages, 3 figures, 1 table; title changed by editor, references updated
arxiv created 2012/03/26 · openalex publication_date 2012/03/29 · arxiv updated 2013/05/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
In terms of the hadron-string-dynamics (HSD) approach, we investigate the correlation function in the azimuthal angle \ensuremathψ of charged hadrons that is expected to be sensitive to a signal of local strong parity violation. Our analysis of Au+Au collisions is based on the recent STAR data within the RHIC beam-energy-scan (BES) program. The HSD model reasonably reproduces STAR data for √sNN=7.7 GeV, while there are some deviations from the experiment at the collision energy of 11.5 GeV and an increase of deviations between theory and experiment at √sNN=39 GeV. For reference, the results for √sNN=200 GeV are given as well. The role of the retarded electromagnetic field is discussed and a compensation effect for the action of its electric and magnetic components is pointed out. We conclude that the recent RHIC BES data at √sNN=7.7 and 11.5 GeV can be understood on the hadronic level without involving the idea of a strong parity violation; however, the HSD model fails to reproduce data for √sNN\ensuremath∼40 GeV and above which suggests that at these energies one has to take into account explicit partonic (quark-qluon) degrees of freedom for a proper treatment of the dynamics as well as a coupling of the partons to fluctuating color fields.