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We compute the angular momentum of the electromagnetic field on a late timeCauchy surface with an arbitrary constant normal vector relevant for theclassical scattering of charged particles. We find a time independentcontribution to the angular momentum. This demonstrates that every chargedparticle scattering event is accompanied by a net shift in the angular momentumof the electromagnetic field. We speculate that this shift is related to asubleading electromagnetic memory effect. We argue that this asymptotic angularmomentum should be included in the description of the asymptotic states inquantum theories containing infrared divergences. We demonstrate that theLorentz covariance of the asymptotic electromagnetic angular momentum can onlybe exhibited upon making reference to the Cauchy slice's normal vector.

Angular momentum of the asymptotic electromagnetic field in the classical scattering of charged particles