REVIEW 5 cited by
Dilepton polarization as a signature of plasma anisotropy
Not yet reviewed by Pith; the record is open.
This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.
SPECIMEN: schema-true, not a live event
T0 review · schema-true
One-sentence machine reading of the paper's core claim.
pith:XXXXXXXX · record.json · timestamp
abstract
We propose the angular distribution of lepton pairs produced in ultrarelativistic heavy-ion collisions as a probe of thermalization of the quark-gluon plasma. We focus on dileptons with invariant masses large enough that they are produced through quark-antiquark annihilation in the early stages of the collision. The angular distribution of the lepton in the rest frame of the pair then reflects the angular distribution of quark momenta. At early times, the transverse pressure of the quark-gluon plasma is larger than its longitudinal pressure as a result of the fast longitudinal expansion, which results in an oblate lepton distribution. By contrast, direct (Drell-Yan) production by quarks and antiquarks from incoming nuclei, whose momenta are essentially longitudinal, results in a prolate distribution. As the invariant mass increases, Drell-Yan gradually becomes the dominant source of dilepton production, and the lepton distribution evolves from oblate to prolate. The invariant mass at which the transition occurs is highly sensitive to the equilibration time of the quark-gluon plasma or, equivalently, the shear viscosity over entropy ratio $\eta/s$ in the early stages of the collision.
Forward citations
Cited by 5 Pith papers
-
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...
-
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...
-
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.
-
Thermal dilepton production within conformal viscous Gubser flow
Thermal dilepton yields and effective temperatures are computed for conformal viscous Gubser flow, showing larger yields for lower q (larger systems) and higher effective temperatures for smaller systems.
-
Theory Summary
A conference summary paper reports selected theory results from Quark Matter 2025 in heavy-ion physics, with no new original research.
Discussion (0). Continue with ORCID to comment.