Speaker
Risto Paatelainen
(University of Jyväskylä)
Description
Using next-to-leading order perturbative QCD and a conjecture of saturation to suppress the production of low energy quanta, we calculate the initial energy densities and formation times for the dissipative fluid dynamical evolution of the quark-gluon plasma produced in ultrarelativistic heavy ion collisions [1,2].
We identify the uncertainties of the model and demonstrate the predictive power of the approach by obtaining a good global agreement with the measured centrality dependence of the charged particle multiplicities, transverse
momentum spectra and elliptic flow simultaneously for the Pb+Pb collisions at the LHC and Au+Au at RHIC. In particular, the shear viscosity-to-entropy ratio in the different phases of QCD matter is simultaneously constrained by all these data. In order to study higher cumulants $v_n$ and their event-by-event (EbyE) distributions, we are currently engaged in modeling the EbyE fluctuations of saturated minijet production in this framework [3]. Also these results will be reported.
[1] R. Paatelainen, K. J. Eskola, H. Holopainen and K. Tuominen, **Phys. Rev. C87** (2012) 044904
[2] R. Paatelainen, K. J. Eskola, H. Niemi and K. Tuominen, **arXiv:1310.3105** [hep-ph], to appear in **Phys. Lett. B**
[3] H. Niemi, K. J. Eskola, R. Paatelainen and K. Tuominen, work in progress
Authors
Harri Niemi
(University of Jyväskylä)
Kari J. Eskola
(University of Jyvaskyla)
Dr
Kimmo Tuominen
(University of Helsinki)
Risto Paatelainen
(University of Jyväskylä)
