Abstract
Positron beams, both polarized and unpolarized, are identified as important ingredients for the experimental programs at the next generation of lepton accelerators. In the context of the hadronic physics program at Jefferson Lab (JLab), positron beams are complementary, even essential, tools for a precise understanding of the electromagnetic structure of nucleons and nuclei, in both the elastic and deep-inelastic regimes. For instance, elastic scattering of polarized and unpolarized electrons and positrons from the nucleon enables a model independent determination of its electromagnetic form factors. Also, the deeply-virtual scattering of polarized and unpolarized electrons and positrons allows unambiguous separation of the different contributions to the cross section of the lepto-production of photons and of lepton-pairs, enabling an accurate determination of the nucleons and nuclei generalized parton distributions, and providing an access to the gravitational form factors of the energy-momentum tensor. Furthermore, positron beams offer the possibility of alternative tests of the Standard Model of particle physics through the search of a dark photon, the precise measurement of electroweak couplings, and the investigation of charged lepton flavor violation. This document discusses the perspectives of an experimental program with high duty-cycle positron beams at JLab.
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Data Availability Statement
This manuscript has no associated data or the data will not be deposited. [Authors’ comment: The discussion presented in this article develops from already existing and published data which are duly referenced.]
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Acknowledgements
This article is part of a project that has received funding from the European Union’s Horizon 2020 research and innovation program under agreement STRONG - 2020 - No 824093. It is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177.
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Accardi, A., Afanasev, A., Albayrak, I. et al. An experimental program with high duty-cycle polarized and unpolarized positron beams at Jefferson Lab. Eur. Phys. J. A 57, 261 (2021). https://doi.org/10.1140/epja/s10050-021-00564-y
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DOI: https://doi.org/10.1140/epja/s10050-021-00564-y