학술논문
An experimental program with high duty-cycle polarized and unpolarized positron beams at Jefferson Lab
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article
Author
Accardi, A; Afanasev, A; Albayrak, I; Ali, SF; Amaryan, M; Annand, JRM; Arrington, J; Asaturyan, A; Atac, H; Avakian, H; Averett, T; Gayoso, C Ayerbe; Bai, X; Barion, L; Battaglieri, M; Bellini, V; Beminiwattha, R; Benmokhtar, F; Berdnikov, VV; Bernauer, JC; Bertone, V; Bianconi, A; Biselli, A; Bisio, P; Blunden, P; Boer, M; Bondì, M; Brinkmann, K-T; Briscoe, WJ; Burkert, V; Cao, T; Camsonne, A; Capobianco, R; Cardman, L; Carmignotto, M; Caudron, M; Causse, L; Celentano, A; Chatagnon, P; Chen, J-P; Chetry, T; Ciullo, G; Cline, E; Cole, PL; Contalbrigo, M; Costantini, G; D'Angelo, A; Darmé, L; Day, D; Defurne, M; Napoli, M De; Deur, A; Vita, R De; D'Hose, N; Diehl, S; Diefenthaler, M; Dongwi, B; Dupré, R; Dutrieux, H; Dutta, D; Ehrhart, M; Fassi, L El; Elouadrhiri, L; Ent, R; Erler, J; Fernando, IP; Filippi, A; Flay, D; Forest, T; Fuchey, E; Fucini, S; Furletova, Y; Gao, H; Gaskell, D; Gasparian, A; Gautam, T; Girod, F-X; Gnanvo, K; Grames, J; Grauvoge, GN; Gueye, P; Guidal, M; Habet, S; Hague, TJ; Hamilton, DJ; Hansen, O; Hasell, D; Hattawy, M; Higinbotham, DW; Hobart, A; Horn, T; Hyde, CE; Ibrahim, H; Ilyichev, A; Italiano, A; Joo, K; Joosten, SJ; Khachatryan, V; Kalantarians, N; Kalicy, G
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Abstract
Positron beams, both polarized and unpolarized, are identified as essentialingredients for the experimental programs at the next generation of leptonaccelerators. In the context of the hadronic physics program at Jefferson Lab(JLab), positron beams are complementary, even essential, tools for a preciseunderstanding of the electromagnetic structure of nucleons and nuclei, in boththe elastic and deep-inelastic regimes. For instance, elastic scattering ofpolarized and unpolarized electrons and positrons from the nucleon enables amodel independent determination of its electromagnetic form factors. Also, thedeeply-virtual scattering of polarized and unpolarized electrons and positronsallows unambiguous separation of the different contributions to the crosssection of the lepto-production of photons and of lepton-pairs, enabling anaccurate determination of the nucleons and nuclei generalized partondistributions, and providing an access to the gravitational form factors.Furthermore, positron beams offer the possibility of alternative tests of theStandard Model of particle physics through the search of a dark photon, theprecise measurement of electroweak couplings, and the investigation of chargedlepton flavor violation. This document discusses the perspectives of anexperimental program with high duty-cycle positron beams at JLab.