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Title: Dihadron Azimuthal Correlations in Au+Au Collisions at s_NN = 200 GeV

Abstract

Azimuthal angle ({Delta}{sup {phi}}) correlations are presented for a broad range of transverse momentum (0.4 < p{sub T} < 10 GeV/c) and centrality (0-92%) selections for charged hadrons from dijets in Au+Au collisions at {radical} s{sub NN} = 200 GeV. With increasing p{sub T}, the away-side {Delta}{sup {phi}} distribution evolves from a broad and relatively flat shape to a concave shape, then to a convex shape. Comparisons with p+p data suggest that the away-side distribution can be divided into a partially suppressed 'head' region centered at {Delta}{sup {phi}} {approx} {pi}, and an enhanced 'shoulder' region centered at {Delta}{sup {phi}} {approx} {pi} {+-} 1.1. The p{sub T} spectrum for the associated hadrons in the head region softens toward central collisions. The spectral slope for the shoulder region is independent of centrality and trigger p{sub T}. The properties of the near-side distributions are also modified relative to those in p+p collisions, reflected by the broadening of the jet shape in {Delta}{sup {phi}} and {Delta}{sup {eta}}, and an enhancement of the per-trigger yield. However, these modifications seem to be limited to p{sub T} {approx}< 4 GeV/c, above which both the hadron pair shape and per-trigger yield become similar to p+p collisions. These observationsmore » suggest that both the away- and near-side distributions contain a jet fragmentation component which dominates for p{sub T} {approx}> 5 GeV/c and a medium-induced component which is important for p{sub T} {approx}< 4 GeV/c. We also quantify the role of jets at intermediate and low p{sub T} through the yield of jet-induced pairs in comparison with binary scaled p+p pair yield. The yield of jet-induced pairs is suppressed at high pair proxy energy (sum of the p{sub T} magnitudes of the two hadrons) and is enhanced at low pair proxy energy. The former is consistent with jet quenching; the latter is consistent with the enhancement of soft hadron pairs due to transport of lost energy to lower p{sub T}.« less

Authors:
 [1];  [2];  [2];  [3];  [2];  [2];  [4];  [2];  [2]
  1. University of Colorado, Boulder
  2. ORNL
  3. University of Tennessee, Knoxville (UTK) & Oak Ridge National Laboratory (ORNL)
  4. University of Tennessee, Knoxville (UTK)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
934939
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 78; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DISTRIBUTION; FRAGMENTATION; HADRONS; MODIFICATIONS; QUENCHING; SHAPE; TRANSPORT; TRANSVERSE MOMENTUM

Citation Formats

Adare, A., Awes, Terry C, Cianciolo, Vince, Efremenko, Yuri, Read, Jr, Kenneth F, Silvermyr, David O, Sorensen, Soren P, Stankus, Paul W, Young, Glenn R, and PHENIX, Collaboration. Dihadron Azimuthal Correlations in Au+Au Collisions at s_NN = 200 GeV. United States: N. p., 2008. Web. doi:10.1103/PhysRevC.78.014901.
Adare, A., Awes, Terry C, Cianciolo, Vince, Efremenko, Yuri, Read, Jr, Kenneth F, Silvermyr, David O, Sorensen, Soren P, Stankus, Paul W, Young, Glenn R, & PHENIX, Collaboration. Dihadron Azimuthal Correlations in Au+Au Collisions at s_NN = 200 GeV. United States. https://doi.org/10.1103/PhysRevC.78.014901
Adare, A., Awes, Terry C, Cianciolo, Vince, Efremenko, Yuri, Read, Jr, Kenneth F, Silvermyr, David O, Sorensen, Soren P, Stankus, Paul W, Young, Glenn R, and PHENIX, Collaboration. Tue . "Dihadron Azimuthal Correlations in Au+Au Collisions at s_NN = 200 GeV". United States. https://doi.org/10.1103/PhysRevC.78.014901.
@article{osti_934939,
title = {Dihadron Azimuthal Correlations in Au+Au Collisions at s_NN = 200 GeV},
author = {Adare, A. and Awes, Terry C and Cianciolo, Vince and Efremenko, Yuri and Read, Jr, Kenneth F and Silvermyr, David O and Sorensen, Soren P and Stankus, Paul W and Young, Glenn R and PHENIX, Collaboration},
abstractNote = {Azimuthal angle ({Delta}{sup {phi}}) correlations are presented for a broad range of transverse momentum (0.4 < p{sub T} < 10 GeV/c) and centrality (0-92%) selections for charged hadrons from dijets in Au+Au collisions at {radical} s{sub NN} = 200 GeV. With increasing p{sub T}, the away-side {Delta}{sup {phi}} distribution evolves from a broad and relatively flat shape to a concave shape, then to a convex shape. Comparisons with p+p data suggest that the away-side distribution can be divided into a partially suppressed 'head' region centered at {Delta}{sup {phi}} {approx} {pi}, and an enhanced 'shoulder' region centered at {Delta}{sup {phi}} {approx} {pi} {+-} 1.1. The p{sub T} spectrum for the associated hadrons in the head region softens toward central collisions. The spectral slope for the shoulder region is independent of centrality and trigger p{sub T}. The properties of the near-side distributions are also modified relative to those in p+p collisions, reflected by the broadening of the jet shape in {Delta}{sup {phi}} and {Delta}{sup {eta}}, and an enhancement of the per-trigger yield. However, these modifications seem to be limited to p{sub T} {approx}< 4 GeV/c, above which both the hadron pair shape and per-trigger yield become similar to p+p collisions. These observations suggest that both the away- and near-side distributions contain a jet fragmentation component which dominates for p{sub T} {approx}> 5 GeV/c and a medium-induced component which is important for p{sub T} {approx}< 4 GeV/c. We also quantify the role of jets at intermediate and low p{sub T} through the yield of jet-induced pairs in comparison with binary scaled p+p pair yield. The yield of jet-induced pairs is suppressed at high pair proxy energy (sum of the p{sub T} magnitudes of the two hadrons) and is enhanced at low pair proxy energy. The former is consistent with jet quenching; the latter is consistent with the enhancement of soft hadron pairs due to transport of lost energy to lower p{sub T}.},
doi = {10.1103/PhysRevC.78.014901},
url = {https://www.osti.gov/biblio/934939}, journal = {Physical Review C},
number = 1,
volume = 78,
place = {United States},
year = {2008},
month = {1}
}