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We investigate the azimuthal angular correlation between the leptontransverse momentum $P_\perp$ and the impact parameter $b_\perp$ in non-centralheavy-ion collisions, where the leptons are produced through two-photonscattering. Among the Fourier harmonic coefficients, a significant $v_4$asymmetry is found for the typical kinematics at RHIC and LHC with a milddependence on the $P_\perp$, whereas $v_2$ is power suppressed by the leptonmass over $P_\perp$. This unique prediction, if confirmed from the experiments,shall provide crucial information on the production mechanism for the dileptonin two-photon processes.

Momentum Anisotropy of Leptons from Two Photon Processes in Heavy Ion Collisions