Naslov
Beam-Energy and System-Size Dependence of Dynamical Net Charge Fluctuations

Autori
Abelev, B.I. ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; et al. (the STAR Collaboration)

Izvornik
Physical Review C - Nuclear Physics (0556-2813) 79 (2009), 2; 024906-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
charge correlation strength

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
Art. no. 024906.

POVEZANOST RADA