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Polarization of Thermal Dilepton Radiation
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abstract
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 $\rho$-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.
Forward citations
Cited by 4 Pith papers
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Thermal dilepton polarization and dynamics of the QCD plasma in relativistic heavy-ion collisions
Using next-to-leading-order rates, the paper predicts that dilepton polarization changes sign and magnitude in low and intermediate invariant-mass ranges, making it a sensitive probe of gluonic processes and pre-equil...
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Thermal Dilepton Polarization under Rotation or Magnetic Field in Heavy-ion Collisions
Vorticity and magnetic fields induce characteristically different dilepton polarization spectra via modified quark propagators, with λ_θ decreasing monotonically under rotation but oscillating under magnetic fields du...
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Renormalization-Group Invariant Parity-Doublet Model for Nuclear and Neutron-Star Matter
Including baryonic vacuum fluctuations in the parity-doublet model through an RG-invariant mean-field scheme moves the chiral transition to higher densities and turns it into a smooth crossover for most values of the ...
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Effective temperatures of the QGP from thermal photon and dilepton production
In the Trajectum model, dilepton effective temperatures reliably track the quark-gluon plasma temperature, while photon effective temperatures are biased by flow and stay near 250-300 MeV.
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