Probing the Low-x Structure of the Nucleus with the PHENIX Detector

Chiu, Mickey

doi:10.3204/DESY-PROC-2012-02/133

Contribution to a conference proceedings/Internal Report

PUBDB-2016-00831

Probing the Low-x Structure of the Nucleus with the PHENIX Detector

Chiu, M. (Corresponding author)

2012
Deutsches Elektronen-Synchrotron, DESY Hamburg

20th International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS 2012, Bonn, Germany, 26 Mar 2012 - 30 Mar 2012 Hamburg : Deutsches Elektronen-Synchrotron, DESY 513-516 (2012) [10.3204/DESY-PROC-2012-02/133]

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Please use a persistent id in citations: doi:10.3204/DESY-PROC-2012-02/133

Report No.: arXiv:1210.2439

Abstract: One of the fundamental goals of the PHENIX experiment is to understand the structure of cold nuclear matter, since this serves as the initial state for heavy-ion collisions. Knowing the initial state is vital for interpreting measurements from heavy-ion collisions. Moreover, the structure of the cold nucleus by itself is interesting since it is a test-bed for our understanding of QCD. In particular there is the possibility of novel QCD effects such as gluon saturation at low-x in the nucleus. At RHIC we can probe the behavior of gluons at low-x by measuring the pair cross-section of di-hadrons from di-jets in d+Au collisions. Our results show a systematic decrease in the pair cross-section as one goes to smaller impact parameters of the nucleus, and also as one goes to lower Bjorken x. There is a possibility that these interesting effects come from gluon recombination at low x in the Au nucleus.

Keyword(s): quantum chromodynamics ; gluon: recombination ; gluon: saturation ; cross section: measured ; nucleus: structure function ; small-x ; initial state ; PHENIX ; Brookhaven RHIC Coll ; impact parameter ; Bjorken