Baryon number and electric charge fluctuations in Pb+Pb collisions at relativistic energies
- Bogolyubov Institute for Theoretical Physics, Kiev (Ukraine)
- Frankfurt Institute for Advanced Studies, Frankfurt (Germany)
Event-by-event fluctuations of the net baryon number and electric charge in nucleus-nucleus collisions are studied in Pb+Pb at SPS energies within the Hadron-String Dynamics (HSD) transport model. We reveal an important role of the fluctuations in the number of target nucleon participants. They strongly influence all measured fluctuations even in the samples of events with rather rigid centrality trigger. This fact can be used to check different scenarios of nucleus-nucleus collisions by measuring the multiplicity fluctuations as a function of collision centrality in fixed kinematical regions of the projectile and target hemispheres. The HSD results for the event-by-event fluctuations of electric charge in central collisions at 20A,30A,40A,80A, and 158A GeV are in a good agreement with the NA49 experimental data and considerably larger than expected in a quark-gluon plasma. This demonstrates that the distortions of the initial fluctuations by the hadronization phase and, in particular, by the final resonance decays dominate the observable fluctuations.
- OSTI ID:
- 20864233
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 74, Issue 6; Other Information: DOI: 10.1103/PhysRevC.74.064911; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
Similar Records
Particle number fluctuations in high-energy nucleus-nucleus collisions from microscopic transport approaches
Energy and centrality dependence of p and p production and the {lambda}/p ratio in Pb+Pb collisions between 20A GeV and 158A GeV