HAL : in2p3-00303483, version 1
 arXiv : 0807.3269
 Physical Review C 79 (2009) 024906
 Beam-Energy and System-Size Dependence of Dynamical Net Charge Fluctuations
 STAR Collaboration(s)
 (2009)
 We present measurements of net charge fluctuations in $Au + Au$ collisions at $\sqrt{s_{NN}} =$ 19.6, 62.4, 130, and 200 GeV, $Cu + Cu$ collisions at $\sqrt{s_{NN}} =$ 62.4, 200 GeV, and $p + p$ collisions at $\sqrt{s} =$ 200 GeV using the dynamical net charge fluctuations measure $\nu_{+-{\rm,dyn}}$. We observe that the dynamical fluctuations are non-zero 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.
 Thème(s) : Physique/Physique Nucléaire Expérimentale
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0807.3269
 in2p3-00303483, version 1 http://hal.in2p3.fr/in2p3-00303483 oai:hal.in2p3.fr:in2p3-00303483 Contributeur : Dominique Girod <> Soumis le : Mardi 22 Juillet 2008, 09:50:59 Dernière modification le : Vendredi 6 Mars 2009, 11:00:51