Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-09-02
Adv.Nucl.Phys. 25 (2000) 1
Physics
High Energy Physics
High Energy Physics - Phenomenology
164 pages LaTeX including 88 eps-/ps-figures, Review Article to appear in Adv. Nucl. Phys
Scientific paper
The current theoretical status in the analysis and interpretation of low-mass dilepton measurements in (ultra-) relativistic heavy-ion experiments is reviewed. Special emphasis is put on potential signals of (partial) restoration of dynamically broken chiral symmetry in a hot and dense hadronic medium. It follows from chiral symmetry alone that parity partners of hadronic correlation functions must become identical when the symmetry is restored. The assessment of medium effects in the vector channel, which governs the dilepton production, thus necessitates a simultaneous treatment of the vector and axialvector degrees of freedom. While significant progress in this respect has been made some open questions remain in establishing a rigorous link in the mass region below 1 GeV. From the present calculations a suggestive 'quark-hadron duality' emerges near the phase boundary. It implies substantial medium effects in the dilepton signal from the hadronic phase which smoothly matches a perturbative description within the plasma phase.
Rapp Ralf
Wambach Jochen
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