Suppression of back-to-back Hadron Pairs at forward rapidity in d+Au collisions at √sNN=200GeV

PHENIX Collaboration

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117 Scopus citations


Back-to-back hadron pair yields in d+Au and p+p collisions at √s NN=200GeV 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.

Original languageEnglish
Article number172301
JournalPhysical Review Letters
Issue number17
StatePublished - 18 Oct 2011
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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