Physics with Positron Beams at Jefferson Lab 12 GeV
Abstract
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 or the precise measurement of electroweak couplings. This letter proposes to develop an experimental positron program at JLab to perform unique high impact measurements with respect to the two-photon exchange problem, the determination of the proton and the neutron GPDs, and the search for the dark photon.
Cite
@article{arxiv.1906.09419,
title = {Physics with Positron Beams at Jefferson Lab 12 GeV},
author = {A. Afanasev and I. Albayrak and S. Ali and M. Amaryan and A. D'Angelo and J. Annand and J. Arrington and A. Asaturyan and H. Avakian and T. Averett and L. Barion and M. Battaglieri and V. Bellini and V. Berdnikov and J. Bernauer and A. Biselli and M. Boer and M. Bondì and K. -T. Brinkmann and B. Briscoe and V. Burkert and A. Camsonne and T. Cao and L. Cardman and M. Carmignotto and L. Causse and A. Celentano and P. Chatagnon and G. Ciullo and M. Contalbrigo and D. Day and M. Defurne and S. Diehl and B. Dongwi and R. Dupré and D. Dutta and M. Ehrhart and L. Elouadrhiri and R. Ent and I. Fernando and A. Filippi and Y. Furletova and H. Gao and A. Gasparian and D. Gaskell and F. Georges and F. -X. Girod and J. Grames and C. Gu and M. Guidal and D. Hamilton and D. Hasell and D. Higinbotham and M. Hoballah and T. Horn and C. Hyde and A. Italiano and N. Kalantarians and G. Kalicy and D. Keller and C. Keppel and M. Kerver and P. King and E. Kinney and H. -S. Ko and M. Kohl and V. Kubarovsky and L. Lanza and P. Lenisa and N. Liyanage and S. Liuti and J. Mamei and D. Marchand and P. Markowitz and L. Marsicano and M. Mazouz and M. McCaughan and B. McKinnon and M. Mihovilovič and R. Milner and A. Mkrtchyan and H. Mkrtchyan and A. Movsisyan and C. Muñoz Camacho and P. Nadel-Turońs and M. De Napoli and J. Nazeer and S. Niccolai and G. Niculescu and R. Novotny and L. Pappalardo and R. Paremuzyan and E. Pasyuk and T. Patel and I. Pegg and D. Perera and A. Puckett and N. Randazzo and M. Rashad and M. Rathnayake and A. Rizzo and J. Roche and O. Rondon and A. Schmidt and M. Shabestari and Y. Sharabian and S. Širca and D. Sokhan and A. Somov and N. Sparveris and S. Stepanyan and I. Strakovsky and V. Tadevosyan and M. Tiefenback and R. Trotta and R. De Vita and H. Voskanyan and E. Voutier and R. Wang and B. Wojtsekhowski and S. Wood and H. -G. Zaunick and S. Zhamkochyan and J. Zhang and S. Zhao and X. Zheng and C. Zorn},
journal= {arXiv preprint arXiv:1906.09419},
year = {2019}
}
Comments
Letter-of-Intent to Jefferson Lab PAC46