Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-09-21
Nucl.Phys. B570 (2000) 379-389
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, includes 7 eps-figures
Scientific paper
10.1016/S0550-3213(99)00720-8
We compute how the initial energy density and produced gluon, quark and antiquark numbers scale with atomic number and beam energy in ultrarelativistic heavy ion collisions. The computation is based on the argument that the effect of all momentum scales can be estimated by performing the computation at one transverse momentum scale, the saturation momentum. The initial numbers are converted to final ones by assuming kinetic thermalisation and adiabatic expansion. The main emphasis of the study is at LHC and RHIC energies but it is observed that even at SPS energies this approach leads to results which are not unreasonable: what is usually described as a completely soft nonperturbative process can also be described in terms of gluons and quarks. The key element is the use of the saturation scale.
Eskola Kari. J.
Kajantie K.
Ruuskanen P. V.
Tuominen Kimmo
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