The Rise and Fall of the Ridge in Heavy Ion Collisions

Details The Rise and Fall of the Ridge in Heavy Ion Collisions The Rise and Fall of the Ridge in Heavy Ion Collisions

2011-02-07

arxiv.org/abs/1102.1403v2

Physics

Nuclear Physics

Nuclear Theory

1 Figure and text added

Scientific paper

Recent data from heavy ion collisions at RHIC show unexpectedly large near-angle correlations that broaden longitudinally with increasing centrality. The amplitude of this ridge-like correlation rises rapidly, reaches a maximum, and then falls in the most central collisions. In this letter we explain how this behavior can be explained as initial-state coordinate-space anisotropies converted into final-state momentum-space correlations. We propose $v_n^2/\epsilon_{n,\mathrm{part}}^{2}$ as a useful way to study length scales and provide a prediction for the ridge in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 2.76 TeV.

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