Net-charge fluctuations in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV

Submission Date: 
26/07/2012
Article Information
Submission Form
System: 
Pb-Pb
Energy: 
2.76 TeV
Abstract Plain Text: 

 

 

 

We report the first measurement of the net–charge fluctuations in Pb–Pb collisions at 2.76 TeV, measured with the ALICE detector at the CERN Large Hadron Collider. The dynamical fluctuations per unit entropy are observed to decrease when going from peripheral to central colli- sions. An additional reduction in the amount of fluctuations is seen in comparison to the results from lower energies. We examine the dependence of fluctuations on the pseudo–rapidity interval, which may account for the dilution of fluctuations during the evolution of the system. We find that the ALICE data are between the theoretically predicted values for a hadron gas and a Quark–Gluon Plasma (QGP), indicating that the fluctuations might have their origin in the QGP phase.