Reference : Scattering of twisted particles: Extension to wave packets and orbital helicity
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Scattering of twisted particles: Extension to wave packets and orbital helicity
Ivanov, Igor mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Physique des astroparticules >]
Serbo, Valery mailto [Novosibirsk State University > > > >]
Physical Review. A
American Physical Society
Yes (verified by ORBi)
College Park
[en] High-energy photons and other particles carrying nonzero orbital angular momentum (OAM) emerge as a new tool in high-energy physics. Recently, it was suggested to generate high-energy photons with nonzero OAM (twisted photons) by the Compton backscattering of twisted optical photons on relativistic electron beams. Twisted electrons in the intermediate energy range have also been demonstrated experimentally; twisted protons and other particles can, in principle, be created in a similar way. Collisions of energetic twisted states can offer a new look at particle properties and interactions. A theoretical description of twisted particle scattering developed previously treated them as pure Bessel states and ran into difficulty when describing the OAM of the final twisted particle at nonzero scattering angles. Here we develop further this formalism by incorporating two additional important features. First, we treat the initial OAM state as a wave packet of a finite transverse size rather than a pure Bessel state. This realistic assumption allows us to resolve the existing controversy between two theoretical analyses for nonforward scattering. Second, we describe the final twisted particle in terms of the orbital helicity: the OAM projection on its average direction of propagation rather than on the fixed reaction axis. Using this formalism, we determine to what extent the twisted state is transferred from the initial to final OAM particle in a generic scattering kinematics. As a particular application, we prove that in the Compton backscattering the orbital helicity of the final photon stays close to the OAM projection of the initial photon.

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