“School of Particles”
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| Paper IPM / Particles / 11882 |
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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 (Dh) and the full range of relative azimuthal angle (Df). The data were collected with the CMS detector, at the LHC. A broadening
of the away-side (Df=p) azimuthal correlation is observed at all Dh, as compared to the measurements in pp collisions. Furthermore, long-range dihadron correlations in Dh are observed for particles with similar f values. This phenomenon, also known as the ?ridge?, persists up to at least Dn = 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
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