Study on manipulation mechanism of polarized positrons in nonlinear Breit-Wheeler scattering process

Kou Yuhan; Ababekri Mamutjan; Huang Yaqing; Wang Yu; Li Jianxing

doi:10.11884/HPLPB202638.250410

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Kou Yuhan, Ababekri Mamutjan, Huang Yaqing, et al. Study on manipulation mechanism of polarized positrons in nonlinear Breit-Wheeler scattering process[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250410

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Kou Yuhan, Ababekri Mamutjan, Huang Yaqing, et al. Study on manipulation mechanism of polarized positrons in nonlinear Breit-Wheeler scattering process[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250410

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Study on manipulation mechanism of polarized positrons in nonlinear Breit-Wheeler scattering process

doi: 10.11884/HPLPB202638.250410

Department of Physics, Xi’an Jiaotong University, Xi’an 710049, China

Received Date: 2025-11-18
Accepted Date: 2026-01-06
Rev Recd Date: 2025-12-20

Available Online: 2026-01-30

Abstract

Abstract

Background
Polarized positron beams are vital probes in fundamental physics. Generating them via the nonlinear Breit-Wheeler process in laser fields is a promising new approach, but control over the positron polarization requires further understanding.
Purpose
This study investigates how laser and γ-photon parameters control the final polarization of positrons in this process.
Methods
Within strong-field QED, we fully include all particle spins and the laser pulse's finite envelope. Systematic calculations are performed across various laser intensities, γ-photon energies, and polarization configurations.
Results
Key findings are: (1) No positron polarization arises with linearly polarized lasers and γ-photons. (2) When only one is circularly polarized, it dominates the positron polarization, which decreases with higher laser intensity or γ-photon energy. (3) With both circularly polarized, γ-photons dominate high-energy positron polarization, while both sources co-determine low-energy positron polarization, with laser intensity playing a stronger regulatory role.
Conclusions
These results clarify the dominant factors for positron polarization, providing a key theoretical basis for designing optimized laser-driven polarized positron sources.
- polarized positrons,
- nonlinear Breit-Wheeler process,
- strong-field quantum electrodynamics,
- intense laser,
- electron-positron pair production

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References(28)

References

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