Suppression of Back-to-Back Hadron Pairs at Forward Rapidity in d + Au Collisions at s_NN=200 GeV

Back-to-back hadron pair yields in d+Au and p+p collisions at {radical}s{sub NN} = 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 |{eta}| < 0.35 and the associated hadro...

Full description

Saved in:
Bibliographic Details
Published in:Physical review letters 2011-01, Vol.107 (17)
Main Authors: Adare, A., Awes, Terry C, Cianciolo, Vince, Efremenko, Yuri V, Efremenko, Yuri, Enokizono, Akitomo, Read Jr, Kenneth F, Silvermyr, David O, Sorensen, Soren P, Stankus, Paul W
Format: Article
Language:English
Subjects:
ATOMIC AND MOLECULAR PHYSICS
GLUONS
HADRONS
HEAVY IONS
IMPACT PARAMETER
NUCLEAR MATTER
NUCLEONS
PARTICLE RAPIDITY
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PROBES
THICKNESS
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Back-to-back hadron pair yields in d+Au and p+p collisions at {radical}s{sub NN} = 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 |{eta}| < 0.35 and the associated hadron at forward rapidity (deuteron direction, 3.0 < {eta} < 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, p{sub T}, and {eta} points to cold nuclear matter effects arising at high parton densities.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.107.172301