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Suppression of Back-to-Back Hadron Pairs at Forward Rapidity in d+ Au Collisions at sqrt [s_ {NN}]= 200 GeV

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1928/20561

Suppression of Back-to-Back Hadron Pairs at Forward Rapidity in d+ Au Collisions at sqrt [s_ {NN}]= 200 GeV

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Title: Suppression of Back-to-Back Hadron Pairs at Forward Rapidity in d+ Au Collisions at sqrt [s_ {NN}]= 200 GeV
Author: Fields, Douglas E.; PHENIX Collaboration; Brooks, M. L.; Butsyk, S.; Grim, G.; Jiang, X.; Kapustinsky, J.; Kunde, G. J.; Lee, D. M.; Leitch, M. J.; Liu, H.; Liu, M. X.; McGaughey, P. L.; Sondheim, W. E.; Van Hecke, H.W.; Bassalleck, B.; Malik, M. D.; Thomas, T. L.; Younus, I.; Al-Bataineh, H.; Dharmawardane, K.V.; Kyle, G. S.; Papavassiliou, V.; Pate, S. F.; Wang, X. R.
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.
Date: 2011-10-21
Publisher: American Physical Society
Citation: Physical review letters, 107(17): 1-7
URI: http://hdl.handle.net/1928/20561

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