Evolution of the longitudinal and azimuthal structure of the near-side jet peak in Pb-Pb collisions at root s(NN)=2.76 TeV

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Adam , J , Brucken , E J , Chang , B , Kim , D J , Mieskolainen , M M , Orava , R , Rak , J , Räsänen , S S , Snellman , T W , Trzaska , W H , Viinikainen , J & The ALICE Collaboration 2017 , ' Evolution of the longitudinal and azimuthal structure of the near-side jet peak in Pb-Pb collisions at root s(NN)=2.76 TeV ' , Physical Review C , vol. 96 , no. 3 , 034904 . https://doi.org/10.1103/PhysRevC.96.034904

Title: Evolution of the longitudinal and azimuthal structure of the near-side jet peak in Pb-Pb collisions at root s(NN)=2.76 TeV
Author: Adam, J.; Brucken, E. J.; Chang, B.; Kim, D. J.; Mieskolainen, M. M.; Orava, R.; Rak, J.; Räsänen, S. S.; Snellman, T. W.; Trzaska, W. H.; Viinikainen, J.; The ALICE collaboration
Contributor organization: Helsinki Institute of Physics
Date: 2017-09-08
Language: eng
Number of pages: 18
Belongs to series: Physical Review C
ISSN: 2469-9985
DOI: https://doi.org/10.1103/PhysRevC.96.034904
URI: http://hdl.handle.net/10138/225844
Abstract: In two-particle angular correlation measurements, jets give rise to a near-side peak, formed by particles associated to a higher-p(T) trigger particle. Measurements of these correlations as a function of pseudorapidity (Delta eta) and azimuthal (Delta phi) differences are used to extract the centrality and p(T) dependence of the shape of the near-side peak in the p(T) range 1 <p(T) <8 GeV/c in Pb-Pb and pp collisions at root s(NN) = 2.76 TeV. A combined fit of the near-side peak and long-range correlations is applied to the data and the peak shape is quantified by the variance of the distributions. While the width of the peak in the Delta phi direction is almost independent of centrality, a significant broadening in the Delta eta direction is found from peripheral to central collisions. This feature is prominent for the low-p(T) region and vanishes above 4 GeV/c. The widths measured in peripheral collisions are equal to those in pp collisions in the Delta phi direction and above 3 GeV/c in the Delta eta direction. Furthermore, for the 10% most central collisions and 1 <p(T, assoc) <2 GeV/c, 1 <p(T,trig) <3 GeV/c, a departure from a Gaussian shape is found: a depletion develops around the center of the peak. The results are compared to A Multi-Phase Transport (AMPT) model simulation as well as other theoretical calculations indicating that the broadening and the development of the depletion are connected to the strength of radial and longitudinal flow.
Subject: TRANSVERSE-MOMENTUM
ROOT-S-NN=2.76 TEV
CENTRALITY DEPENDENCE
ANISOTROPIC FLOW
ATLAS DETECTOR
SUPPRESSION
PP
114 Physical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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