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Paper   IPM / Particles And Accelerator / 11882
School of Particles and Accelerator
  Title:   Long-range and short-range dihadron angular correlations in central PbPb collisions at sqrt(s NN) = 2.76 TeV
1.  Hessamadin Arfaei
2.  Hamed Bakhshiansohi
3.  Seyed Mohsen Etesami
4.  Ali Fahim
5.  Majid Hashemi
6.  Abideh Jafari
7.  Mohsen Khakzad
8.  A Mohammadi
9.  Mojtaba Mohammadi Najafabadi
10.  Saeid Paktinat Mehdiabadi
11.  Batool Safarzadeh
12.  Maryam Zeinali
  Status:   Published
  Journal: JHEP
  No.:  076
  Vol.:  1107
  Year:  2011
  Supported by:  IPM
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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