Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2012-03-02
Physics
Nuclear Physics
Nuclear Experiment
WPCF 2011
Scientific paper
Charge fluctuations provide a possible signature for the existence of the de-confined Quark Gluon Plasma phase (QGP). Being sensitive to the square of the charges, fluctuations in QGP, with fractionally charged partons, are significantly different from those of a hadron gas with unit charged particles. Studies of charge fluctuations have been carried out using the variable, $\nu_{(+-,dyn)}$ which, by its construction, is free from collisional bias (impact parameter fluctuations and fluctuations from the finite number of charged particles within the detector acceptance). The dependence of charge fluctuations on the pseudo--rapidity windows for various centrality bins is analyzed for Pb--Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV in the ALICE experiment at CERN-LHC. A scaling behavior is observed as a function of increasing pseudo-rapidity window for the charge fluctuations, expressed in terms of \nchnudyn, where $N_{ch}$ is the number of charged particles. The results are compared to experimental measurements at lower energies and to model predictions.
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