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A measurement is presented of the charged hadron multiplicity in hadronicPbPb collisions, as a function of pseudorapidity and centrality, at a collisionenergy of 2.76 TeV per nucleon pair. The data sample is collected using the CMSdetector and a minimum-bias trigger, with the CMS solenoid off. The number ofcharged hadrons is measured both by counting the number of reconstructedparticle hits and by forming hit doublets of pairs of layers in the pixeldetector. The two methods give consistent results. The charged hadronmultiplicity density dN(ch)/d eta, evaluated at eta=0 for head-on collisions,is found to be 1612 +/- 55, where the uncertainty is dominated by systematiceffects. Comparisons of these results to previous measurements and to variousmodels are also presented.

Dependence on pseudorapidity and centrality of charged hadron production in PbPb collisions at a nucleon-nucleon centre-of-mass energy of 2.76 TeV