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arxiv: 1208.6164 · v3 · pith:EXBGFPRX · submitted 2012-08-30 · nucl-ex

New Measurements of the Transverse Beam Asymmetry for Elastic Electron Scattering from Selected Nuclei

The HAPPEX , PREX Collaborations: S. Abrahamyan , A. Acha , A. Afanasev , Z. Ahmed , H. Albataineh , K. Aniol , D. S. Armstrong
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W. Armstrong J. Arrington T. Averett B. Babineau S. L. Bailey J. Barber A. Barbieri A. Beck V. Bellini R. Beminiwattha H. Benaoum J. Benesch F. Benmokhtar P. Bertin T. Bielarski W. Boeglin P. Bosted F. Butaru E. Burtin J. Cahoon A. Camsonne M. Canan P. Carter C. C. Chang G. D. Cates Y. C. Chao C. Chen J. P. Chen Seonho Choi E. Chudakov E. Cisbani B. Craver F. Cusanno M. M. Dalton R. De Leo K. de Jager W. Deconinck P. Decowski D. Deepa X. Deng A. Deur D. Dutta A. Etile C. Ferdi R. J. Feuerbach J. M. Finn D. Flay G. B. Franklin M. Friend S. Frullani E. Fuchey S. A. Fuchs K. Fuoti F. Garibaldi E. Gasser R. Gilman A. Giusa A. Glamazdin L. E. Glesener J. Gomez M. Gorchtein J. Grames K. Grimm C. Gu O. Hansen J. Hansknecht O. Hen D. W. Higinbotham R. S. Holmes T. Holmstrom C. J. Horowitz J. Hoskins J. Huang T. B. Humensky C. E. Hyde H. Ibrahim F. Itard C. M. Jen E. Jensen X. Jiang G. Jin S. Johnston J. Katich L. J. Kaufman A. Kelleher K. Kliakhandler P. M. King A. Kolarkar S. Kowalski E. Kuchina K. S. Kumar L. Lagamba D. Lambert P. LaViolette J. Leacock J. Leckey IV J. H. Lee J. J. LeRose D. Lhuillier R. Lindgren N. Liyanage N. Lubinsky J. Mammei F. Mammoliti D. J. Margaziotis P. Markowitz M. Mazouz K. McCormick A. McCreary D. McNulty D. G. Meekins L. Mercado Z. E. Meziani R. W. Michaels M. Mihovilovic B. Moffit P. Monaghan N. Muangma C. Munoz-Camacho S. Nanda V. Nelyubin D. Neyret Nuruzzaman Y. Oh K. Otis A. Palmer D. Parno K. D. Paschke S. K. Phillips M. Poelker R. Pomatsalyuk M. Posik M. Potokar K. Prok A. J. R. Puckett X. Qian Y. Qiang B. Quinn A. Rakhman P. E. Reimer B. Reitz S. Riordan J. Roche P. Rogan G. Ron G. Russo K. Saenboonruang A. Saha B. Sawatzky A. Shahinyan R. Silwal J. Singh S. Sirca K. Slifer R. Snyder P. Solvignon P. A. Souder M. L. Sperduto R. Subedi M. L. Stutzman R. Suleiman V. Sulkosky C. M. Sutera W. A. Tobias W. Troth G. M. Urciuoli P. Ulmer A. Vacheret E. Voutier B. Waidyawansa D. Wang K. Wang J. Wexler A. Whitbeck R. Wilson B. Wojtsekhowski X. Yan H. Yao Y. Ye Z. Ye V. Yim L. Zana X. Zhan J. Zhang Y. Zhang X. Zheng V. Ziskin P. Zhu
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keywords measurementsasymmetryelasticnucleiscatteringagreementamplitudebeam
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We have measured the beam-normal single-spin asymmetry $A_n$ in the elastic scattering of 1-3 GeV transversely polarized electrons from $^1$H and for the first time from $^4$He, $^{12}$C, and $^{208}$Pb. For $^1$H, $^4$He and $^{12}$C, the measurements are in agreement with calculations that relate $A_n$ to the imaginary part of the two-photon exchange amplitude including inelastic intermediate states. Surprisingly, the $^{208}$Pb result is significantly smaller than the corresponding prediction using the same formalism. These results suggest that a systematic set of new $A_n$ measurements might emerge as a new and sensitive probe of the structure of heavy nuclei.

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