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Photon polarisation in light-by-light scattering: finite size effects
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We derive a simple expression for the photon helicity and polarisation-flip probabilities in arbitrary background fields, in the low energy regime. Taking the background to model a focused laser beam, we study the impact of pulse shape and collision geometry on the probabilities and on ellipticity signals of vacuum birefringence. We find that models which do not account for pulse duration can overestimate all signals in near head-on collisions by up to an order of magnitude. Taking pulse duration into account, the flip probability becomes relatively insensitive to both angular incidence and the fine details of the pulse structure.
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Cited by 1 Pith paper
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Impact of background field localization on vacuum polarization effects
For Lorentzian background fields with d localized directions, the strong-field scaling of QED vacuum polarization and pair production depends on d, while weak-field scaling does not.
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