Speaker
Mr
Risto Paatelainen
(University of Jyväskylä)
Description
We report the results from the recent studies [1,2], where we have brought the EKRT framework [3] to next-to-leading order (NLO) in pQCD, and shown the viability of the model in describing the produced initial QGP energy densities at the LHC and RHIC.
Our updated framework [1] combines a rigorous NLO pQCD computation of the minijet transverse energy production with the saturation of gluons and fluid dynamics. Latest knowledge of NLO nuclear parton distributions (nPDFs) is utilized. Identifying the key parameters and charting the uncertainties of the model, we obtain an encouragingly good agreement with the charged-particle multiplicities and identified bulk hadron p_T spectra measured in 5% most central Au+Au collisions at RHIC and Pb+Pb at the LHC [1].
To obtain the initial QGP energy-density profiles dynamically in non-central collisions [2], we supplement the calculation by a local saturation condition and impact-parameter dependent nPDFs (EPS09s [4]). We address the main uncertainties associated with the obtained initial states. Using viscous fluid dynamics, we show that a good simultaneous description of the centrality dependence of multiplicity, p_T spectra and elliptic flow is obtained both at the LHC and RHIC.
Ref. [1]
R. Paatelainen, K.J. Eskola, H. Holopainen and K. Tuominen
Phys. Rev. C87 (2012) 044904.
Ref. [2]
R. Paatelainen, K.J. Eskola, and H. Niemi, work in progress.
Ref. [3]
K.J. Eskola, K. Kajantie, P.V. Ruuskanen, K. Tuominen,
Nuc. Phys. B570 (2000) 379.
Ref. [4]
I. Helenius, K.J. Eskola, H. Honkanen and C.A. Salgado,
JHEP 1207 (2012) 073.
Keywords
initial state, QGP
Primary author
Mr
Risto Paatelainen
(University of Jyväskylä)
Co-authors
Dr
Hannu Holopainen
(Frankfurt Institute for Advanced Studies)
Dr
Harri Niemi
(University of Jyväskylä)
Prof.
Kari Eskola
(University of Jyväskylä)
