Photon and Electron Polarization in High-Energy Bremsstrahlung and Pair Production with Screening

Olsen, Haakon A.; Maximon, L. C.

doi:10.1103/physrev.114.887

Cited by 353 publications

(259 citation statements)

References 25 publications

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“…In the leading quasiclassical approximation, the cross sections for pair photoproduction and bremsstrahlung have been obtained in [14][15][16][17][18]. The first quasiclassical corrections to the spectra of both processes, as well as to the total cross section of pair photoproduction, have been obtained in Refs.…”

Section: Introductionmentioning

confidence: 99%

Charge asymmetry in the differential cross section of high-energy bremsstrahlung in the field of a heavy atom

Krachkov

Milstein

2015

Phys. Rev. A

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The distinction between the charged particle and antiparticle differential cross sections of highenergy bremsstrahlung in the electric field of a heavy atom is investigated. The consideration is based on the quasiclassical approximation to the wave functions in the external field. The charge asymmetry (the ratio of the antisymmetric and symmetric parts of the differential cross section) arises due to the account for the first quasiclassical correction to the differential cross section. All evaluations are performed with the exact account of the atomic field. We consider in detail the charge asymmetry for electrons and muons. For electrons, the nuclear size effect is not important while for muons this effect should be taken into account. For the longitudinal polarization of the initial charged particle, the account for the first quasiclassical correction to the differential cross section leads to the asymmetry in the cross section with respect to the replacement ϕ → −ϕ, where ϕ is the azimuth angle between the photon momentum and the momentum of the final charged particle.

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Section: Introductionmentioning

confidence: 99%

Charge asymmetry in the differential cross section of high-energy bremsstrahlung in the field of a heavy atom

Krachkov

Milstein

2015

Phys. Rev. A

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“…The polarisation of the electron is transferred to the photon due to helicity conservation, which is exactly described by QED [7]. To obtain the photon polarisation, it is required to determine the absolute electron polarisation.…”

Section: Circularly Polarised Photon Beamsmentioning

confidence: 99%

Polarised Photon Beams for the BGO-OD Experiment at ELSA

Zimmermann¹,

Bella²,

Alef³

et al. 2016

Proceedings of the 10th International Workshop on the Physics of Excited Nucleons (NSTAR2015)

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“…Past theoretical works showed that the asymmetry is larger when the two leptons share the energy equally [37], that it varies with the (azimuthal) acoplanarity, ϕ + −ϕ − [38] and that it is larger for small pair opening angles [39]. Many attempts have been undertaken to increase the effective polarization asymmetry by applying a well-chosen event selection on the collected sample, in the hope that the sensitivity to polarization would be increased [40,41,42,43,44,45,46].…”

Section: γ-Ray Polarimetry With Pairs: Techniquesmentioning

confidence: 99%

γ-Ray polarimetry with conversions to e+e− pairs: Polarization asymmetry and the way to measure it

Gros

Bernard

2017

Astroparticle Physics

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We revisit the measurement of the polarization fraction, P , and the measurement of the polarization angle of partially linearly-polarized gamma rays using their conversion to e + e − pairs in the field of a nucleus. We show that an inappropriate definition of the azimuthal angle, ϕ, used to reference the orientation of the final state degrades the precision of the measurement of P , by comparison to the optimal case where the bisector angle of the electron and of the positron momenta is used. We then focus on the lowest part of the energy spectrum, below ≈ 10 MeV, where a large part of the statistics lie for a cosmic source. We obtain the value of the polarization asymmetry, A, of pair conversion at threshold and we show that in the case where the correct expression is used for ϕ, the measured value of A tends to the limit.

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Photon and Electron Polarization in High-Energy Bremsstrahlung and Pair Production with Screening

Cited by 353 publications

References 25 publications

Charge asymmetry in the differential cross section of high-energy bremsstrahlung in the field of a heavy atom

Charge asymmetry in the differential cross section of high-energy bremsstrahlung in the field of a heavy atom

Polarised Photon Beams for the BGO-OD Experiment at ELSA

γ-Ray polarimetry with conversions to e+e− pairs: Polarization asymmetry and the way to measure it

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