Fermionic signal of vacuum polarization in strong laser fields
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866910466573336576 |
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| author | Dai, Ya-Nan Hatsagortsyan, Karen Z. Keitel, Christoph H. Chen, Yue-Yue |
| author_facet | Dai, Ya-Nan Hatsagortsyan, Karen Z. Keitel, Christoph H. Chen, Yue-Yue |
| contents | Vacuum polarization (VP) is investigated for the interaction of a polarized $γ$-ray beam of GeV photons with a counterpropagating ultraintense laser pulse. In a conventional setup of a vacuum birefringence measurement, a VP signal is the emerging small circular (linear) polarization of the initially linearly (circularly) polarized probe photons. The pair production via the nonlinear Breit-Wheeler process in such a high-energy environment eliminates part of the $γ$-photons in the outgoing $γ$-beam, increasing the statistical error and decreasing the accuracy of this VP signal. In contrast, we investigate the conversion of the emerging circular polarization of $γ$-photons into longitudinal polarization of the created positrons, considering the latter as the main VP signal. To study the VP effects in the highly nonlinear regime, where the Euler-Heisenberg effective Lagrangian method breaks down, we have developed a Monte-Carlo simulation method, incorporating vacuum birefringence and dichroism via the one-loop QED probabilities in the locally constant field approximation. Our Monte Carlo method will enable the study of VP effects in strong fields of arbitrary configuration. With 10~PW laser systems, we demonstrate the feasibility of detecting the fermionic signal of the VP effect at the 5$σ$ confidence level with a few hours of measurement time. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_11168 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Fermionic signal of vacuum polarization in strong laser fields Dai, Ya-Nan Hatsagortsyan, Karen Z. Keitel, Christoph H. Chen, Yue-Yue High Energy Physics - Theory Plasma Physics Vacuum polarization (VP) is investigated for the interaction of a polarized $γ$-ray beam of GeV photons with a counterpropagating ultraintense laser pulse. In a conventional setup of a vacuum birefringence measurement, a VP signal is the emerging small circular (linear) polarization of the initially linearly (circularly) polarized probe photons. The pair production via the nonlinear Breit-Wheeler process in such a high-energy environment eliminates part of the $γ$-photons in the outgoing $γ$-beam, increasing the statistical error and decreasing the accuracy of this VP signal. In contrast, we investigate the conversion of the emerging circular polarization of $γ$-photons into longitudinal polarization of the created positrons, considering the latter as the main VP signal. To study the VP effects in the highly nonlinear regime, where the Euler-Heisenberg effective Lagrangian method breaks down, we have developed a Monte-Carlo simulation method, incorporating vacuum birefringence and dichroism via the one-loop QED probabilities in the locally constant field approximation. Our Monte Carlo method will enable the study of VP effects in strong fields of arbitrary configuration. With 10~PW laser systems, we demonstrate the feasibility of detecting the fermionic signal of the VP effect at the 5$σ$ confidence level with a few hours of measurement time. |
| title | Fermionic signal of vacuum polarization in strong laser fields |
| topic | High Energy Physics - Theory Plasma Physics |
| url | https://arxiv.org/abs/2401.11168 |