Speaker
Description
We present the first comprehensive study of dilepton production from a hot, magnetized quark
gluon plasma in heavy-ion collisions (HIC), incorporating realistic, time-dependent, and spatially
inhomogeneous magnetic field profiles within an analytically solvable Gubser flow background. This
framework provides a significant improvement over previous static calculations with homogeneous
f
ields and moves toward the long-term goal of full 3 + 1D magnetohydrodynamic simulations. We
explore the effects of impact parameter, electrical conductivity, and invariant mass on the dilepton
spectra and anisotropic even flow coefficients. It is found that transverse momentum spectra increase
with impact parameter, dominated by annihilation processes, while decay contributions remain sub
leading. Strikingly, the elliptic flow v2 from decay channels is nonzero even in nearly central colli
sions, exhibiting a characteristic shape—positive at low pT and negative at high pT—that is largely
independent of impact parameter and conductivity. In contrast, v2 from annihilation processes is
smaller in magnitude but dominates the total flow in magnitude due to its larger yield. Higher
harmonics, such as v4, are an order of magnitude smaller as compared to v2 along with distinctive
zero-crossing patterns. Conductivity enhances both spectra and flow but leaves no unambiguous
signature for its extraction. Varying the invariant mass reveals the strongest enhancements at low
mass, with harmonic coefficients suppressed at higher masses. Overall, our results suggest that
central and semi-central collisions can carry imprints of the background magnetic field, and that
characteristic correlations in even flow harmonics may provide a robust probe of electromagnetic
effects in HICs.
