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arXiv 2006.12435nucl-ex
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前向角弹性电子-质子散射束流法向单自旋不对称性的精确测量

Precision Measurement of the Beam-Normal Single-Spin Asymmetry in Forward-Angle Elastic Electron-Proton Scattering

QWeak collaboration, D. Androic, D. S. Armstrong, A. Asaturyan, K. Bartlett, J. Beaufait, R. S. Beminiwattha, J. Benesch, F. Benmokhtar, J. Birchall, R. D. Carl… 展开作者

QWeak collaboration, D. Androic, D. S. Armstrong, A. Asaturyan, K. Bartlett, J. Beaufait, R. S. Beminiwattha, J. Benesch, F. Benmokhtar, J. Birchall, R. D. Carlini, J. C. Cornejo, S. Covrig Dusa, M. M. Dalton, C. A. Davis, W. Deconinck, J. F. Dowd, J. A. Dunne, D. Dutta, W. S. Duvall, M. Elaasar, W. R. Falk, J. M. Finn, T. Forest, C. Gal, D. Gaskell, M. T. W. Gericke, J. Grames, V. M. Gray, K. Grimm, F. Guo, J. R. Hoskins, D. Jones, M. K. Jones, R. T. Jones, M. Kargiantoulakis, P. M. King, E. Korkmaz, S. Kowalski, J. Leacock, J. P. Leckey, A. R. Lee, J. H. Lee, L. Lee, S. MacEwan, D. Mack, J. A. Magee, R. Mahurin, J. Mammei, J. W. Martin, M. J. McHugh, D. Meekins, J. Mei, K. E. Mesick, R. Michaels, A. Micherdzinska, A. Mkrtchyan, H. Mkrtchyan, N. Morgan, A. Narayan, L. Z. Ndukum, V. Nelyubin, Nuruzzaman, W. T. H van Oers, V. F. Owen, S. A. Page, J. Pan, K. D. Paschke, S. K. Phillips, M. L. Pitt, R. W. Radloff, J. F. Rajotte, W. D. Ramsay, J. Roche, B. Sawatzky, T. Seva, M. H. Shabestari, R. Silwal, N. Simicevic, G. R. Smith, P. Solvignon, D. T. Spayde, A. Subedi, R. Subedi, R. Suleiman, V. Tadevosyan, W. A. Tobias, V. Tvaskis, B. Waidyawansa, P. Wang, S. P. Wells, S. A. Wood, S. Yang, P. Zang, S. Zhamkochyan

摘要:

在横向极化电子与非极化核子的散射中产生的束法单自旋不对称性是与双光子交换过程虚部有关的一个观测量。本文报道了电子-质子弹性散射中束流法向单自旋不对称性的2%精度测量,平均散射角为θ_lab = 7.9度,平均能量为1.149 GeV。不对称结果为B_n = -5.194 +-0.067(stat)+-0.082(syst)ppm。这是迄今为止对这个量的最精确的测量,因此提供了在远向前散射角(theta_lab -> 0)下对双光子交换模型的严格测试,其中它们应该是最可靠的。

英文摘要:

A beam-normal single-spin asymmetry generated in the scattering of transversely polarized electrons from unpolarized nucleons is an observable related to the imaginary part of the two-photon exchange process. We report a 2% precision measurement of the beam-normal single-spin asymmetry in elastic electron-proton scattering with a mean scattering angle of theta_lab = 7.9 degrees and a mean energy of 1.149 GeV. The asymmetry result is B_n = -5.194 +- 0.067 (stat) +- 0.082 (syst) ppm. This is the most precise measurement of this quantity available to date and therefore provides a stringent test of two-photon exchange models at far-forward scattering angles (theta_lab -> 0) where they should be most reliable.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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