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  • “School of Particles”

     
    Paper   IPM / Particles / 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
      Author(s):
    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
      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 (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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