Long-range And Short-range Dihadron Angular Correlations In Central PbPb Collisions At psNN = 2:76 TeV

Authors

S. Chatrchyan, Yerevan Physics Institute
Marc M. Baarmand, Florida Institute of Technology
B. Dorney, Florida Institute of Technology
Samir Guragain, Florida Institute of Technology
Marcus Hohlmann, Florida Institute of Technology
Himali Kalakhety, Florida Institute of Technology
Robert Ralich, Florida Institute of Technology
Igor Vodopiyanov, Florida Institute of Technology
The CMS Collaboration

Document Type

Article

Publication Title

Journal of High Energy Physics

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 (∆η) and the full range of relative azimuthal angle (∆η). The data were collected with the CMS detector, at the LHC. A broadening of the away-side (∆ϕ ≈ π) azimuthal correlation is observed at all ∆η, as compared to the measurements in pp collisions. Furthermore, long-range dihadron correlations in ∆η are observed for particles with similar ϕ values. This phenomenon, also known as the “ridge”, persists up to at least |∆η| = 4. For particles with transverse momenta (pT) o f2-4 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.

DOI

10.1007/JHEP07(2011)076

Publication Date

2011

Recommended Citation

Chatrchyan, S.; Baarmand, Marc M.; Dorney, B.; Guragain, Samir; Hohlmann, Marcus; Kalakhety, Himali; Ralich, Robert; Vodopiyanov, Igor; and The CMS Collaboration, "Long-range And Short-range Dihadron Angular Correlations In Central PbPb Collisions At psNN = 2:76 TeV" (2011). Aerospace, Physics, and Space Science Faculty Publications. 565.
https://repository.fit.edu/apss_faculty/565