弱混合角的新测量
摘要
SLAC 的 E158 实验对电子-电子 (Moller) 散射中的偏振破坏进行了首次测量。我们报告了使用 45 和 48 GeV 偏振电子束与液态氢靶内未偏振电子进行弹性散射中 right-left 偏振破坏横截面不对称性 (APV) 的初步结果，使用了累计数据的 50%。我们发现 APV = (-160 ± 21 (stat.) ± 17 (syst.)) 匹克布尔，观察偏振破坏的显著性为 6.3σ。在标准模型的框架下，这给出了在 Q² = 0.026 GeV² 处的弱混合角测量 sin²(θW-MSBAR) = 0.2379 ± 0.0016 (stat.) ± 0.0013 (syst.)。我们还 presenting 首次观察到 Moller 散射中单极转向不对称性的初步结果。
引用
@article{arxiv.hep-ex/0403010,
title = {A New Measurement of the Weak Mixing Angle},
author = {M. Woods},
journal= {arXiv preprint arXiv:hep-ex/0403010},
year = {2019}
}
备注
32 pages, 27 figures. Presented at the 31st SLAC Summer Institute on Particle Physics: Cosmic Connections to Particle Physics (SSI 2003), July 28 - August 8, 2003; Menlo Park, CA. Revised May 8, 2004 to reflect update in theoretical calculation by Zykunov (Ref. 32) for brem correction needed to extract weak mixing angle from measured asymmetry. Also took opportunity to included published references for References 16, 17, 18