engleski

Measurement of emission angle anisotropy via long-range angular correlations with high pT hadrons in d+Au and p+p collisions at sqrt(s_NN)=200 GeV

We present measurements of two-particle angular correlations between high-transverse-momentum (2<pT<11 GeV/c) π0 observed at midrapidity (|η| <0.35) and particles produced either at forward (3.1<η<3.9) or backward (−3.7<η<−3.1) rapidity in d+Au and p+p collisions at sqrt(sNN)=200 GeV. The azimuthal angle correlations for particle pairs with this large rapidity gap in the Au-going direction exhibit a ridge-like structure that persists up to pT≈6 GeV/c and which strongly depends on collision centrality, which is a similar characteristic to the hydrodynamical particle flow in A+A collisions. The ridge-like structure is absent in the d-going direction as well as in p+p collisions, in the transverse- momentum range studied. The results indicate that the ridge-like structure is shifted in the Au- going direction toward more central collisions, similar to the charged-particle pseudorapidity distributions.

correlations ; anisotropy ; PHENIX

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