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Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-58962

# CMS Collaboration,; Amsler, C; Chiochia, V; Snoek, H; Favaro, C; Verzetti, M; Aguiló, E; De Visscher, S; Schmitt, A; Ivova, M; Millan, B; Otyugova, P; Storey, J (2011). Long-range and short-range dihadron angular correlations in central PbPb collisions at √sNN = 2.76 TeV. Journal of High Energy Physics, (7):76.

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## Abstract

First measurements of dihadron correlations for charged particles are presented for central PbPb collisions at a nucleon-nucleon center-of-mass energy 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 were collected with the CMS detector, at the LHC. A broadening of the away-side (Delta(phi) approximately pi) azimuthal correlation is observed at all Delta(eta), as compared to the measurements in pp collisions. Furthermore, long-range dihadron correlations in Delta(eta) are observed for particles with similar phi values. This phenomenon, also known as the "ridge", persists up to at least |Delta(eta)| = 4. For particles with transverse momenta (pt) of 2-4 GeV/c, the ridge is found to be most prominent when these particles are correlated with particles of pt = 2-6 GeV/c, and to be much reduced when paired with particles of pt = 10-12 GeV/c.

## Citations

9 citations in Web of Science®
5 citations in Scopus®