# The energy dependence of p$_t$ angular correlations inferred from mean-pt fluctuation scale dependence in heavy ion collisions at the SPS and RHIC

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 pt 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.
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Journal articles

http://hal.in2p3.fr/in2p3-00137239
Contributor : Yvette Heyd <>
Submitted on : Monday, March 19, 2007 - 10:22:43 AM
Last modification on : Thursday, August 6, 2020 - 6:03:20 PM

### Citation

J. Adams, M.M. Aggarwal, Z. Ahammed, J. Amonett, B.D. Anderson, et al.. The energy dependence of p$_t$ angular correlations inferred from mean-pt fluctuation scale dependence in heavy ion collisions at the SPS and RHIC. Journal of Physics G: Nuclear and Particle Physics, IOP Publishing, 2007, 34, pp.451-465. ⟨10.1088/0954-3899/34/3/004⟩. ⟨in2p3-00137239⟩

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