Electric Conductivity of QCD Matter and Dilepton Spectra in Heavy-Ion Collisions
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arXiv
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866914843469021184 |
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| author | Rapp, Ralf |
| author_facet | Rapp, Ralf |
| contents | The electric conductivity, $σ_{\rm el}$, 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 3-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, we investigate the sensitivity of low-mass dilepton spectra in Pb-Pb collisions at the LHC to $σ_{\rm el}$. In particular, we disentangle the contributions from QGP and hadronic emission, and identify signatures that can help to extract $σ_{\rm el}$ from high-precision experimental data expected to be attainable with future detector systems at the LHC. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_14656 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Electric Conductivity of QCD Matter and Dilepton Spectra in Heavy-Ion Collisions Rapp, Ralf High Energy Physics - Phenomenology Nuclear Experiment Nuclear Theory The electric conductivity, $σ_{\rm el}$, 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 3-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, we investigate the sensitivity of low-mass dilepton spectra in Pb-Pb collisions at the LHC to $σ_{\rm el}$. In particular, we disentangle the contributions from QGP and hadronic emission, and identify signatures that can help to extract $σ_{\rm el}$ from high-precision experimental data expected to be attainable with future detector systems at the LHC. |
| title | Electric Conductivity of QCD Matter and Dilepton Spectra in Heavy-Ion Collisions |
| topic | High Energy Physics - Phenomenology Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2406.14656 |