Abstract
Measurements of charged dihadron Δη–Δϕ correlations from the CMS collaboration are presented for Pb–Pb collisions at a center-of-mass energy of 2.76 TeV per nucleon pair over a broad range of pseudorapidity and the full range of azimuthal angle. A significant correlated yield is observed for pairs of particles with small Δϕ but large longitudinal separation Δη, commonly known as the ‘ridge’. The ridge persists up to at least |Δη| = 4 and the dependence of the ridge region shape and yield on collision centrality and transverse momentum has been measured. A Fourier analysis of the long-range two-particle correlation is presented and discussed in the context of higher order flow coefficients.
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