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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:

Submitted

Journal:

High Energy Physics

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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