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First measurements of dihadron correlations for charged particles arepresented for central PbPb collisions at a nucleon-nucleon center-of-massenergy of 2.76 TeV over a broad range in relative pseudorapidity, Delta(eta),and the full range of relative azimuthal angle, Delta(phi). The data werecollected with the CMS detector, at the LHC. A broadening of the away-side(Delta(phi) approximately pi) azimuthal correlation is observed at allDelta(eta), as compared to the measurements in pp collisions. Furthermore,long-range dihadron correlations in Delta(eta) are observed for particles withsimilar phi values. This phenomenon, also known as the "ridge", persists up toat least |Delta(eta)| = 4. For particles with transverse momenta (pt) of 2-4GeV/c, the ridge is found to be most prominent when these particles arecorrelated with particles of pt = 2-6 GeV/c, and to be much reduced when pairedwith particles of pt = 10-12 GeV/c.

Long-range and short-range dihadron angular correlations in central PbPb collisions at a nucleon-nucleon center of mass energy of 2.76 TeV