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An atom placed in an optical vortex close to the axis may, upon absorbing aphoton, acquire a transverse momentum much larger than the transverse momentumof any plane-wave component of the vortex lightfield. This surprisingphenomenon dubbed superkick has been clarified previously in terms of the atomwave packet evolution in the field of an optical vortex treated classically.Here, we study this effect within the quantum field theoretical (QFT)framework. We consider collision of a Bessel twisted wave with a compactGaussian beam focused to a small focal spot $\sigma$ located at distance $b$from the twisted beam axis. Through a qualitative discussion supported by exactanalytical and numerical calculations, we recover the superkick phenomenon for$\sigma \ll b$ and explore its limits when $\sigma$ becomes comparable to $b$.On the way to the final result within the QFT treatment, we encountered andresolved apparent paradoxes related to subtle issues of the formalism. Theseresults open a way to a detailed QFT exploration of other superkick-relatedeffects recently suggested to exist in high-energy collisions.

Observability of the superkick effect within a quantum-field-theoretical approach