低$Q^2$下质子弹性形状因子比率$\mu_pG_E/G_M$的高精度测量
核实验
2015-05-27 v2
摘要
我们报告了一项新的、高精度的质子弹性形状因子比率在四动量转移平方 (GeV/c)范围内的测量结果。该测量在杰斐逊实验室（JLab）A厅使用反冲极化法进行。总不确定度约为1%，新数据清楚地表明，先前在高极化测量中观察到的比率与1的偏差持续下降到本次测量的最低值。包含新结果的更新全局拟合显示，在该范围内，电（磁）形状因子比之前的全局拟合大约小2%（大1%）。我们获得了质子电半径和磁半径的新提取值，分别为 fm和 fm。电荷半径与基于电子-质子相互作用的其他近期提取结果（包括原子氢兰姆移位测量）一致，这表明在比较使用电子探针的质子电荷半径测量结果与近期从μ子氢兰姆移位提取的结果时，存在一个缺失的修正。
引用
@article{arxiv.1102.0318,
title = {High Precision Measurement of the Proton Elastic Form Factor Ratio $\mu_pG_E/G_M$ at low $Q^2$},
author = {X. Zhan and K. Allada and D. S. Armstrong and J. Arrington and W. Bertozzi and W. Boeglin and J. -P. Chen and K. Chirapatpimol and S. Choi and E. Chudakov and E. Cisbani and P. Decowski and C. Dutta and S. Frullani and E. Fuchey and F. Garibaldi and S. Gilad and R. Gilman and J. Glister and K. Hafidi and B. Hahn and J. -O. Hansen and D. W. Higinbotham and T. Holmstrom and R. J. Holt and J. Huang and G. M. Huber and F. Itard and C. W. de Jager and X. Jiang and J. Johnson and J. Katich and R. de Leo and J. J. LeRose and R. Lindgren and E. Long and D. J. Margaziotis and S. May-Tal Beck and D. Meekins and R. Michaels and B. Moffit and B. E. Norum and M. Olson and E. Piasetzky and I. Pomerantz and D. Protopopescu and X. Qian and Y. Qiang and A. Rakhman and R. D. Ransome and P. E. Reimer and J. Reinhold and S. Riordan and G. Ron and A. Saha and A. J. Sarty and B. Sawatzky and E. C. Schulte and M. Shabestari and A. Shahinyan and S. Sirca and P. Solvignon and N. F. Sparveris and S. Strauch and R. Subedi and V. Sulkosky and I. Vilardi and Y. Wang and B. Wojtsekhowski and Z. Ye and Y. Zhang},
journal= {arXiv preprint arXiv:1102.0318},
year = {2015}
}
备注
12 pages, 3 figures