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.

Accardi, A., Afanasev, A., Albayrak, I., Ali, S.f., Amaryan, M., Annand, J., et al. (2021). An experimental program with high duty-cycle polarized and unpolarized positron beams at Jefferson Lab. THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI, 57(8) [10.1140/epja/s10050-021-00564-y].

An experimental program with high duty-cycle polarized and unpolarized positron beams at Jefferson Lab

D'Angelo A.
Membro del Collaboration Group
;
Lanza L.;Rizzo A.
Membro del Collaboration Group
;
2021-08-28

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.
28-ago-2021
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/04 - FISICA NUCLEARE E SUBNUCLEARE
English
Con Impact Factor ISI
electromagnetic form-factors; virtual compton-scattering; generalized; parton distributions; squared 4-momentum transfers; lepton-flavor; violation; electron-proton; parity violation; pair production; cross-section; ratio; Physics
https://link.springer.com/article/10.1140/epja/s10050-021-00564-y
Accardi, A., Afanasev, A., Albayrak, I., Ali, S.f., Amaryan, M., Annand, J., et al. (2021). An experimental program with high duty-cycle polarized and unpolarized positron beams at Jefferson Lab. THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI, 57(8) [10.1140/epja/s10050-021-00564-y].
Accardi, A; Afanasev, A; Albayrak, I; Ali, Sf; Amaryan, M; Annand, Jrm; Arrington, J; Asaturyan, A; Atac, H; Avakian, H; Averett, T; Gayoso, Ca; Bai, ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/287997
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