High transverse momentum triggered correlations over a large pseudorapidity acceptance in Au+Au collisions at sqrt(s_NN)=200 GeV
Author(s)Alver, Burak Han; Ballintijn, Maarten; Busza, Wit; Decowski, Michael P.; Gulbrandsen, K.; Henderson, C.; Kane, J. L.; Kulinich, Piotr; Li, Wei; Loizides, Constantin; Reed, C.; Roland, Christof E.; Roland, Gunther M.; Stephans, George S. F.; Vale, C.; van Nieuwenhuizen, Gerrit Jan; Vaurynovich, Siarhei S.; Verdier, Robin; Veres, Gabor; Wenger, Edward Allen; Wyslouch, Boleslaw; ... Show more Show less
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A measurement of two-particle correlations with a high transverse momentum trigger particle (p[subscript T][superscript trig]>2.5 GeV/c) is presented for Au+Au collisions at √sNN=200 GeV over the uniquely broad longitudinal acceptance of the PHOBOS detector (-4<Δη<2). A broadening of the away-side azimuthal correlation compared to elementary collisions is observed at all Δη. As in p+p collisions, the near side is characterized by a peak of correlated partners at small angle relative to the trigger particle. However, in central Au+Au collisions an additional correlation extended in Δη and known as the “ridge” is found to reach at least |Δη|≈4. The ridge yield is largely independent of Δη over the measured range, and it decreases towards more peripheral collisions. For the chosen p[subscript T][superscript trig] cut, the ridge yield is consistent with zero for events with less than roughly 100 participating nucleons.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Physical Review Letters
American Physical Society
Alver, B. et al. “High Transverse Momentum Triggered Correlations over a Large Pseudorapidity Acceptance in Au+Au Collisions at sNN=200 GeV.” Physical Review Letters 104.6 (2010): 062301. Print.
Final published version