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CERN Heavy Ion Forum
1. Photons and Dileptons from the Quark-Gluon Plasma2. Implication of percolation of colour strings on multiplicity, correlations and the tr
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Europe/Zurich
40-S2- (CERN)
40-S2-
CERN
Description
1. Photons and Dileptons from the Quark-Gluon Plasma
by Markus Thoma/CERN
Photons and dileptons produced in relativistic heavy ion collisions provide a promising signature for the quark-gluon plasma formation.
A review will be given on the latest perturbative and non-perturbative results for the production rates of photons and dileptons emitted from a quark-gluon plasma. Using hydrodynamical calculations the photon and dilepton spectra, containing the most recent production rates, will be discussed in the case of an equilibrated as well as non-equilibrated quark-gluon plasma. In particular, a unique signal in the dilepton spectrum for the existence of deconfined quarks will be proposed.
2. Implication of percolation of colour strings on multiplicity, correlations and the transverse momentum
by M. Braun/St. Petersburg State University
In the colour string model the impact of string percolation on multiplicity, average transverse momentum and their long-range (forward-backward) correlation is studied. It is assumed that different string overlaps produce observed hadrons independently.
The multiplicity is shown to be moderately damped by a simple factor, which follows from the percolation theory. The average transverse momenta rise at the same rate as multiplicity fall.
A clear signature of the percolation phase transition is found to be the behaviour of the forward-backward correlations for intensive quantities, such as the transverse momentum or its inverse, which can be detected in the high-energy heavy ion collisions. Studies of the forward-backward correlations in ALICE are discussed.