e$^+$@JLab White Paper: An Experimental Program with Positron Beams at Jefferson Lab

作者：Alberto Accardi, Andrei Afanasev, I. Albayrak, S.F. Ali, M. J. Amaryan, J. R. M. Annand, J. Arrington, A. Asaturyan, H. Avakian, T. Averett, C. Ayerbe Gayoso, L. Barion, M. Battaglieri, Vincenzo Bellini, F. Benmokhtar, В. В. Бердников, J. C. Bernauer, A. Bianconi, A. S. Biselli, M. Boër, M. Bondí, K.-Th. Brinkmann, W. J. Briscoe, V. D. Burkert, T. Cao, A. Camsonne, R. Capobianco, L. S. Cardman, M. Carmignotto, M. Caudron, L. Causse, A. Celentano, P. Chatagnon, T. Chetry, G. Ciullo, E. Cline, P. L. Cole, M. Contalbrigo, G. Costantini, A. D’Angelo, Donal B. Day, M. Defurne, M. De Napoli, A. Deur, R. De Vita, N. d’Hose, S. Diehl, M. Diefenthaler, B. Dongwi, R. Dupré, D. Dutta, M. Ehrhart, L. El-Fassi, L. Elouadrhiri, R. Ent, Jens Erler, I. P. Fernando, A. Filippi, D. Flay, T. A. Forest, E. Fuchey, Sara Fucini, Yulia Furletova, H. Gao, D. Gaskell, A. Gasparian, T. Gautam, F. X. Girod, Joseph Grames, P. Guèye, M. Guidal, S. Habet, D. Hamilton, O. Hansen, D. Hasell, M. Hattawy, D. W. Higinbotham, A. Hobart, T. Horn, C. E. Hyde-Wright, H. Ibrahim, A. Italiano, K. Joo, S. Joosten, N. Kalantarians, G. Kalicy, D. Keller, C. Keppel, M. Kerver, A. Kim, J. Kim, P. M. King, E. Kinney, V. Klimenko, H. S. Ko, M. Köhl, V. Kozhuharov, V. Kubarovsky, T. Kutz, L. Lanza, M. Leali, P. Lenisa, N. Liyanage, Q. Liu, Simonetta Liuti, J. Mammei, Sonny Mantry, D. Marchand, P. Markowitz, L. Marsicano, V. Mascagna, M. Mazouz, M. McCaughan, B. McKinnon, D. McNulty, Wally Melnitchouk, Z.-E. Meziani, M. Mihovilovič, R. Milner, A. Mkrtchyan, H. Mkrtchyan, A. Movsisyan, M. Muhoza, C. Muñoz Camacho, J. J. Murphy, P. Nadel-Turoński, J. Nazeer, S. Niccolai, G. Niculescu, R. Novotny, M. Paolone, L. L. Pappalardo, R. Paremuzyan, E. Pasyuk, Tanvi Patel, Ian L. Pegg, C. Peng, D. Perera, M. Poelker, K. Price, A. J. R. Puckett, M. Raggi, N. Randazzo, M. N. H. Rashad, Malinga Rathnayake, B. A. Raue, P. E. Reimer, Matteo Rinaldi, A. Rizzo, J. Roche, G. Ron, G. Salmè, E. Santopinto, R. Santos Estrada, B. Sawatzky, A. Schmidt, P. Schweitzer, Sergio Scopetta, V. Sergeyeva, M. Shabestari, A. Shahinyan, Y. G. Sharabian, S. Širca, E. S. Smith, D. Sokhan, A. Somov, N. Sparveris, M. Spata, S. Stepanyan, P. Stoler, I. I. Strakovsky, R. Suleiman, M. Suresh, Holly Szumila-Vance, V. Tadevosyan, A.S. Tadepalli, Michael Tiefenback, R. Trotta, M. Ungaro, P. Valente, L. Venturelli, H. Voskanyan, E. Voutier, B. Wojtsekhowski, S. A. Wood, Ju-Jun Xie, Z. Ye, M. Yurov, H.-G. Zaunick, S. Zhamkochyan, J. Zhang, S. Zhang, Shengying Zhao, B. Zhao, Xiaochao Zheng, C. Zorn · 发表于：arXiv (Cornell University) · 年份：2020 · 被引用次数：8 · 研究领域：Particle physics theoretical and experimental studies、Particle Accelerators and Free-Electron Lasers、Dark Matter and Cosmic Phenomena

Positron beams, both polarized and unpolarized, are identified as essential ingredients for the experimental program at the next generation of lepton accelerators. In the context of the Hadronic Physics program at the Jefferson Laboratory (JLab), positron beams are complementary, even essential, tools for a precise understanding of the electromagnetic structure of the nucleon, in both the elastic and the deep-inelastic regimes. For instance, elastic scattering of (un)polarized electrons and positrons off the nucleon allows for a model independent determination of the electromagnetic form factors of the nucleon. Also, the deeply virtual Compton scattering of (un)polarized electrons and positrons allows us to separate unambiguously the different contributions to the cross section of the lepto-production of photons, enabling an accurate determination of the nucleon Generalized Parton Distributions (GPDs), and providing an access to its Gravitational Form Factors. Furthermore, positron beams offer the possibility of alternative tests of the Standard Model through the search of a dark photon, the precise measurement of electroweak couplings, or the investigation of lepton flavor violation. This white paper discusses the perspectives of an experimental program with positron beams at JLab.