自由中子衰变中发射电子横向极化的测量
Measurement of Transverse Polarization of Electrons Emitted in Free Neutron Decay
摘要：
最后分析的实验确定两个组件的横向极化的电子（$σ_{T_{1}}$，$σ_{T_{2}}$）发射的$β$ -衰变的极化，自由中子。垂直于中子极化和电子动量的量化$σ_{T_{2}}$的T-奇数、P-奇数相关系数被发现为$R=$ 0.004 $\pm0.012\pm$ 0.005。这个值与时间反演不变性一致，并且显著地改进了早期的结果和对弱相互作用中虚标量耦合的相对强度的限制。获得的与$σ_{T_{1}}$相关的相关系数值$N=$ 0.067 $\pm0.011\pm$ 0.004与标准模型预期一致，提供了实验装置的重要灵敏度测试。本文的结果对弱相互作用中标量和张量耦合的虚部进行了约束。讨论了具有R宇称破坏的轻子交换模型和最小超对称模型参数的意义。
英文摘要：
The final analysis of the experiment determining both components of the transverse polarization of electrons ($σ_{T_{1}}$, $σ_{T_{2}}$) emitted in the $β$-decay of polarized, free neutrons is presented. The T-odd, P-odd correlation coefficient quantifying $σ_{T_{2}}$, perpendicular to the neutron polarization and electron momentum, was found to be $R=$ 0.004$\pm0.012\pm$0.005. This value is consistent with time reversal invariance, and significantly improves both earlier result and limits on the relative strength of imaginary scalar couplings in the weak interaction. The value obtained for the correlation coefficient associated with $σ_{T_{1}}$, $N=$ 0.067$\pm0.011\pm$0.004, agrees with the Standard Model expectation, providing an important sensitivity test of the experimental setup. The present result sets constraints on the imaginary part of scalar and tensor couplings in weak interaction. Implications for parameters of the leptoquark exchange model and minimal supersymmetric model (MSSM) with R-parity violation are discussed.
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