Abstract
The electric conductivity, σel, is a fundamental transport coefficient of QCD matter that can be related to the zero-energy limit of the electromagnetic (EM) spectral function at vanishing three-momentum in the medium. The EM spectral function is also the central quantity to describe the thermal emission rates and pertinent spectra of photon and dilepton radiation in heavy-ion collisions. Employing a model for dilepton rates that combines hadronic many-body theory with nonperturbative QGP emission constrained by lattice QCD which describes existing dilepton measurements in heavy-ion collisions, I investigate the sensitivity of low-mass dilepton spectra in Pb-Pb collisions at the CERN Large Hadron Collider (LHC) to σel. In particular, I separately evaluate the contributions from QGP and hadronic emission, and identify signatures that can help to extract σel from high-precision experimental data expected to be attainable with future detector systems at the LHC. Published by the American Physical Society 2024
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