The Energy dependence of $p_t$ angular correlations inferred from mean-p($t$) fluctuation scale dependence in heavy ion collisions at the SPS and RHIC

The collaboration
J.Phys.G 34 (2007) 451-466, 2007.

Abstract
We present the first study of the energy dependence of $p_t$ angular correlations inferred from event-wise mean transverse momentum $<p_{t} >$ fluctuations in heavy ion collisions. We compare our large-acceptance measurements at CM energies $\sqrt{s_{NN}} =$ 19.6, 62.4, 130 and 200 GeV to SPS measurements at 12.3 and 17.3 GeV. $p_t$ angular correlation structure suggests that the principal source of $p_t$ correlations and fluctuations is minijets (minimum-bias parton fragments). We observe a dramatic increase in correlations and fluctuations from SPS to RHIC energies, increasing linearly with $\ln \sqrt{s_{NN}}$ from the onset of observable jet-related $<p_{t}>$ fluctuations near 10 GeV.

• #### Table 3a

STAR data from Figure 3 - left

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Per-particle fluctuation dependence on pseudorapidity scale $\delta\eta$ in central collisions.

• #### Table 3c

CERES data from Figure 3 - left

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Per-particle fluctuation dependence on pseudorapidity scale $\delta\eta$ in central collisions.

• #### Table 3b

Data from Figure 3 - right

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• #### Table 4b

Data from Figure 4 - right

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Hijing-1.37  fluctuations for central collisions and the STAR acceptance at three energies, for quench-on, quench-off and jets-off collisions.