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The centrality dependence of the charged-particle pseudorapidity densitymeasured with ALICE in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ over a broadpseudorapidity range is presented. This Letter extends the previous resultsreported by ALICE to more peripheral collisions. No strong change of thecharged-particle pseudorapidity density distributions with centrality isobserved, and when normalised to the number of participating nucleons in thecollisions, the evolution over pseudorapidity with centrality is likewisesmall. The broad pseudorapidity range allows precise estimates of the totalnumber of produced charged particles which we find to range from $162\pm22$(syst.) to $17170\pm770$ (syst.) in 80-90% and 0-5 central collisions,respectively. The total charged-particle multiplicity is seen to approximatelyscale with the number of participating nucleons in the collision. This suggeststhat hard contributions to the charged-particle multiplicity are limited. Theresults are compared to models which describe$\mbox{d}N_{\mbox{ch}}/\mbox{d}\eta$ at mid-rapidity in the most central Pb-Pbcollisions and it is found that these models do not capture all features of thedistributions.

physics letters b

Centrality evolution of the charged-particle pseudorapidity density over  a broad pseudorapidity range in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ =  2.76 TeV