Polarization of thermal dilepton radiation
The invariant mass spectra of dileptons radiated from the fireballs formed in high-energy heavy-ion collisions have been successfully used to investigate the properties of hot and dense QCD matter. Using a realistic model for the in-medium electromagnetic spectral function, we predict polarization o...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-02-01
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| Series: | Physics Letters B |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269325000279 |
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| author | Florian Seck Bengt Friman Tetyana Galatyuk Hendrik van Hees Ralf Rapp Enrico Speranza Jochen Wambach |
| author_facet | Florian Seck Bengt Friman Tetyana Galatyuk Hendrik van Hees Ralf Rapp Enrico Speranza Jochen Wambach |
| author_sort | Florian Seck |
| collection | DOAJ |
| description | The invariant mass spectra of dileptons radiated from the fireballs formed in high-energy heavy-ion collisions have been successfully used to investigate the properties of hot and dense QCD matter. Using a realistic model for the in-medium electromagnetic spectral function, we predict polarization observables and compare them to experiment. This allows, for the first time, independent tests of the longitudinal and transverse components of the virtual photon's selfenergy. While the low- and high-mass regions exhibit the expected limits of transverse and unpolarized photons, respectively, baryon-driven medium effects in the ρ-meson mass region create a marked longitudinal polarization that transits into a largely unpolarized emission from the quark-gluon plasma, thus providing a sensitive test of microscopic emission processes in QCD matter. Applications to available data from the HADES and NA60 experiments at SIS and SPS energies, respectively, are consistent with our predictions and set the stage for quantitative polarization studies at FAIR and collider energies. |
| format | Article |
| id | doaj-art-2597b3dab4b0479587300adbb56f54ec |
| institution | Kabale University |
| issn | 0370-2693 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj-art-2597b3dab4b0479587300adbb56f54ec2025-02-10T04:33:56ZengElsevierPhysics Letters B0370-26932025-02-01861139267Polarization of thermal dilepton radiationFlorian Seck0Bengt Friman1Tetyana Galatyuk2Hendrik van Hees3Ralf Rapp4Enrico Speranza5Jochen Wambach6Technische Universität Darmstadt, 64289, Darmstadt, Germany; Corresponding author.GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291, Darmstadt, Germany; Technische Universität Darmstadt, 64289, Darmstadt, GermanyTechnische Universität Darmstadt, 64289, Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291, Darmstadt, GermanyInstitut für Theoretische Physik, Goethe-Universität Frankfurt am Main, Max-von-Laue-Strasse 1, 60438, Frankfurt am Main, Germany; Helmholtz Research Academy Hesse for FAIR, Campus Frankfurt, 60438, Frankfurt, GermanyTexas A&M University, College Station, 77843-3366, TX, USAIllinois Center for Advanced Studies of the Universe & Department of Physics, University of Illinois Urbana-Champaign, Urbana, 61801, IL, USATechnische Universität Darmstadt, 64289, Darmstadt, GermanyThe invariant mass spectra of dileptons radiated from the fireballs formed in high-energy heavy-ion collisions have been successfully used to investigate the properties of hot and dense QCD matter. Using a realistic model for the in-medium electromagnetic spectral function, we predict polarization observables and compare them to experiment. This allows, for the first time, independent tests of the longitudinal and transverse components of the virtual photon's selfenergy. While the low- and high-mass regions exhibit the expected limits of transverse and unpolarized photons, respectively, baryon-driven medium effects in the ρ-meson mass region create a marked longitudinal polarization that transits into a largely unpolarized emission from the quark-gluon plasma, thus providing a sensitive test of microscopic emission processes in QCD matter. Applications to available data from the HADES and NA60 experiments at SIS and SPS energies, respectively, are consistent with our predictions and set the stage for quantitative polarization studies at FAIR and collider energies.http://www.sciencedirect.com/science/article/pii/S0370269325000279Heavy-ion collisionsQCD matterDilepton radiationPolarization observables |
| spellingShingle | Florian Seck Bengt Friman Tetyana Galatyuk Hendrik van Hees Ralf Rapp Enrico Speranza Jochen Wambach Polarization of thermal dilepton radiation Physics Letters B Heavy-ion collisions QCD matter Dilepton radiation Polarization observables |
| title | Polarization of thermal dilepton radiation |
| title_full | Polarization of thermal dilepton radiation |
| title_fullStr | Polarization of thermal dilepton radiation |
| title_full_unstemmed | Polarization of thermal dilepton radiation |
| title_short | Polarization of thermal dilepton radiation |
| title_sort | polarization of thermal dilepton radiation |
| topic | Heavy-ion collisions QCD matter Dilepton radiation Polarization observables |
| url | http://www.sciencedirect.com/science/article/pii/S0370269325000279 |
| work_keys_str_mv | AT florianseck polarizationofthermaldileptonradiation AT bengtfriman polarizationofthermaldileptonradiation AT tetyanagalatyuk polarizationofthermaldileptonradiation AT hendrikvanhees polarizationofthermaldileptonradiation AT ralfrapp polarizationofthermaldileptonradiation AT enricosperanza polarizationofthermaldileptonradiation AT jochenwambach polarizationofthermaldileptonradiation |