质子弱荷的首次测定
核实验
2013-10-30 v2
摘要
Qweak 实验在杰斐逊实验室测量了极化电子 - 质子弹性散射中的宇称破坏不对称性，动量转移平方 ，实验采用 145 微安、89% 纵向极化的电子束轰击 34.4 厘米长的液氢靶。此处报告了该实验调试运行的结果，约占实验收集数据的 4%。根据这些初步结果，测得的不对称性为 （统计）（系统）ppb，这是极化电子 - 质子散射中迄今测得的最小且最精确的不对称性。该实验的小 值使得通过结合更高 下的早期宇称破坏电子散射（PVES）数据以约束强子修正，从而首次测定了质子弱荷 。由此获得的 值为 ，与标准模型预测值 吻合良好。当将此结果与铯原子宇称破坏（APV）测量值进一步结合时，还可以提取出对上下夸克弱荷的显著约束。该 PVES+APV 分析揭示中子的弱荷为 。
引用
@article{arxiv.1307.5275,
title = {First Determination of the Weak Charge of the Proton},
author = {Qweak Collaboration and D. Androic and D. S. Armstrong and A. Asaturyan and T. Averett and J. Balewski and J. Beaufait and R. S. Beminiwattha and J. Benesch and F. Benmokhtar and J. Birchall and R. D. Carlini and G. D. Cates and J. C. Cornejo and S. Covrig and M. M. Dalton and C. A. Davis and W. Deconinck and J. Diefenbach and J. F. Dowd and J. A. Dunne and D. Dutta and W. S. Duvall and M. Elaasar and W. R. Falk and J. M. Finn and T. Forest and D. Gaskell and M. T. W. Gericke and J. Grames and V. M. Gray and K. Grimm and F. Guo and J. R. Hoskins and K. Johnston and D. Jones and M. Jones and R. Jones and M. Kargiantoulakis and P. M. King and E. Korkmaz and S. Kowalski and J. Leacock and J. Leckey and A. R. Lee and J. H. Lee and L. Lee and S. MacEwan and D. Mack and J. A. Magee and R. Mahurin and J. Mammei and J. W. Martin and M. J. McHugh and D. Meekins and J. Mei and R. Michaels and A. Micherdzinska and A. Mkrtchyan and H. Mkrtchyan and N. Morgan and K. E. Myers and A. Narayan and L. Z. Ndukum and V. Nelyubin and Nuruzzaman and W. T. H van Oers and A. K. Opper and S. A. Page and J. Pan and K. D. Paschke and S. K. Phillips and M. L. Pitt and M. Poelker and J. F. Rajotte and W. D. Ramsay and J. Roche and B. Sawatzky and T. Seva and M. H. Shabestari and R. Silwal and N. Simicevic and G. R. Smith and P. Solvignon and D. T. Spayde and A. Subedi and R. Subedi and R. Suleiman and V. Tadevosyan and W. A. Tobias and V. Tvaskis and B. Waidyawansa and P. Wang and S. P. Wells and S. A. Wood and S. Yang and R. D. Young and S. Zhamkochyan},
journal= {arXiv preprint arXiv:1307.5275},
year = {2013}
}
备注
7 pages, 3 figures