Suppression of Back-to-Back Hadron Pairs at Forward Rapidity in d+Au Collisions at √sNN=200 GeV
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Adare-2011-Letters-Suppression of Back-to-Back Hadron Pairs.pdf
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Author(s)
Aidala, Christine A.
Date Issued
October 2011
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Adare, A. et al. “Suppression of Back-to-Back Hadron Pairs at Forward Rapidity in d+Au Collisions at sqrt[s_{NN}]=200 GeV.” Physical Review Letters 107.17 (2011): 172301. © 2011 American Physical Society.
Version
Final published version
Abstract
Back-to-back hadron pair yields in d+Au and p+p collisions at √sNN=200 GeV were measured with the PHENIX detector at the Relativistic Heavy Ion Collider. Rapidity separated hadron pairs were detected with the trigger hadron at pseudorapidity |η|<0.35 and the associated hadron at forward rapidity (deuteron direction, 3.0<η<3.8). Pairs were also detected with both hadrons measured at forward rapidity; in this case, the yield of back-to-back hadron pairs in d+Au collisions with small impact parameters is observed to be suppressed by a factor of 10 relative to p+p collisions. The kinematics of these pairs is expected to probe partons in the Au nucleus with a low fraction x of the nucleon momenta, where the gluon densities rise sharply. The observed suppression as a function of nuclear thickness, pT, and η points to cold nuclear matter effects arising at high parton densities.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.107.172301
