Probability of radiation of twisted photons by classical currents

@article{Bogdanov2018ProbabilityOR,
  title={Probability of radiation of twisted photons by classical currents},
  author={O. V. Bogdanov and P. O. Kazinski and G. Yu. Lazarenko},
  journal={Physical Review A},
  year={2018},
  volume={97},
  pages={033837}
}
The general formula for the probability of radiation of a twisted photon by a classical current is derived. The general theory of generation of twisted photons by undulators is developed. It is proved that the probability to record a twisted photon produced by a classical current is equal to the average number of twisted photons in a given state. The general formula for the projection of the total angular momentum of twisted photons with given the energy, the longitudinal projection of momentum… 

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