Azimuthal di-hadron correlations in d+Au and Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV from STAR

The collaboration
Phys.Rev.C 82 (2010) 024912, 2010.

Abstract (data abstract)
Yields, correlation shapes, and mean transverse momenta pT of charged particles associated with intermediate to high-pT trigger particles (2.5 < pT < 10 GeV/c) in d+Au and Au+Au collisions at sqrt(sNN) = 200 GeV are presented. For associated particles at higher pT > 2.5 GeV\c, narrow correlation peaks are seen in d+Au and Au+Au, indicating that the main production mechanism is jet fragmentation. At lower associated particle pT < 2 GeV/c, a large enhancement of the near- (dphi ~ 0) and away-side (dphi ~ pi) associated yields is found, together with a strong broadening of the away-side azimuthal distributions in Au+Au collisions compared to d+Au measurements, suggesting that other particle production mechanisms play a role. This is further supported by the observed significant softening of the away-side associated particle yield distribution at dphi ~ pi in central Au+Au collisions.

• #### Figure 2 and Figure 10 - part 1

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Background-subtracted azimuthal angle difference distributions for associated particles with pT between 1.0 and 2.5 GeV/c and for different ranges of...

• #### Figure 2 and Figure 10 - part 2

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Background-subtracted azimuthal angle difference distributions for associated particles with pT between 1.0 and 2.5 GeV/c and for different ranges of...

• #### Figure 3 and Figure 11

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Background-subtracted azimuthal angle difference distributions for different trigger particle pT and associated pT in 0-12% central Au+Au collisions and d+Au...

• #### Figure 5

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The angle Delta between the away-side peaks and DeltaPhi = pi for 4 < pT_trig < 6 GeV/c in 0-12%...

• #### Figure 6a

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Near-side (|dphi| < 0.9) associated yield per trigger particle for various trigger particle pT selections as a function of associated...

• #### Figure 6b

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Near-side (|dphi| < 0.9) ratios of the per-trigger associated yields in central Au+Au and d+Au collisions.

• #### Figure 6c

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Away-side (|dphi| > 0.9) associated yield per trigger particle for various trigger particle pT selections as a function of associated...

• #### Figure 6d

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Away-side (|dphi| > 0.9) ratios of the per-trigger associated yields in central Au+Au and d+Au collisions.

• #### Figure 8

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Mean transverse momentum of associated particles with 0.25 < pT,assoc < 4.0 GeV/c, for four different centrality selections.

• #### Figure 9

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Mean transverse momentum (DeltaPhi) of associated hadrons in the range 0.25 < pT_assoc < 4.0 GeV/c in the core...