Abstract
We investigate the azimuthal angular correlation between the lepton transverse momentum P_{⊥} and the impact parameter b_{⊥} in noncentral heavy-ion collisions, where the leptons are produced through two-photon scattering. Among the Fourier harmonic coefficients, a significant v_{4} asymmetry is found for the typical kinematics at RHIC and LHC with a mild dependence on the P_{⊥}, whereas v_{2} is power suppressed by the lepton mass over P_{⊥}. This unique prediction, if confirmed from the experiments, shall provide crucial information on the production mechanism for the dilepton in two-photon processes.
Highlights
We investigate the azimuthal angular correlation between the lepton transverse momentum P⊥ and the impact parameter b⊥ in noncentral heavy-ion collisions, where the leptons are produced through twophoton scattering
They are defined as the anisotropy of final state hadrons in the transverse plane with respect to the impact parameter of the collision [7], e.g., in terms of cosðnφÞ, where φ is the athzeimiumthpaalcat npgalerabmeetwteerenb⃗ ⊥th. eIhnadthroisn’sLemttoemr, ewnteumstpu⃗ dh⊥y and the momentum anisotropy of the leptons from the pure electromagnetic process of γγ → lþl− in heavy-ion collisions
This anisotropy refers to the angular distribution of the leptons with respect to the reaction plane defined by the impact parameter of the collision
Summary
Momentum Anisotropy of Leptons from Two-Photon Processes in Heavy-Ion Collisions We investigate the azimuthal angular correlation between the lepton transverse momentum P⊥ and the impact parameter b⊥ in noncentral heavy-ion collisions, where the leptons are produced through twophoton scattering. This anisotropy refers to the angular distribution of the leptons with respect to the reaction plane defined by the impact parameter of the collision.
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