We also find that the transverse ( φ) dependence of the NC PbPb ( γ γ ) → Pb * Pb * γ γ differential cross section shows large anisotropy near the peak NC contribution for a pure spacelike NC parameter. ![]() ![]() We have demonstrated that γ γ → γ γ is the more appropriate channel to probe scale Λ NC. We apply our NCQED results to the γ γ → γ γ and γ γ → ℓ + ℓ − exclusive channels, convoluted to the ultraperipheral lead Pb 208 ion-ion collisions, where LbyL scattering was recently measured by the ATLAS Collaboration at the LHC. ![]() We investigate scattering amplitudes of the reversible θ-exact Seiberg-Witten map-based noncommutative (NC) quantum electrodynamics and show explicitly the SW map invariance for all types of tree-level NCQED two-by-two processes, including Møller, Bhabha, Compton, pair annihilation, pair production, and light-by-light (LbyL: γ γ → γ γ ) scatterings.
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