Multiplicities for LHC Nuclear Collisions Using HERA Structure Functions
K. J. Eskola, K. Kajantie, P. V. Ruuskanen
Abstract
We compute in QCD perturbation theory the transverse energy carried by gluons, quarks and antiquarks with pT p0≈ 2 GeV in Pb+Pb collisions at s=5500 AGeV by using structure functions compatible with the small-x increase observed at HERA. This gives a perturbative estimate for the energy and entropy density of the bulk system at times τ 0.1 fm. The predicted initial gluon entropy density gives a lower limit of about 2200...3400 for the final charged multiplicity. Sources of further entropy increase are discussed.
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