自由中子衰变中发射电子横向极化的测量
Measurement of the Transverse Polarization of Electrons Emitted in Free Neutron Decay
摘要：
在极化自由中子的β衰变中发射的电子的横向极化的两个分量都已被测量。由中子极化和电子动量定义的垂直于衰变平面的分量的T-奇数、P-奇数相关系数为R=0.008 +/- 0.015 +/-0.005。这个值与时间反演不变性是一致的，并显着提高了限制的相对强度的虚标量耦合在弱相互作用。与衰变平面N=0.056 +/- 0.011 +/- 0.005内包含的电子极化分量相关的相关系数的值与标准模型预期一致，提供了实验装置的重要灵敏度测试。
英文摘要：
Both components of the transverse polarization of electrons emitted in the beta-decay of polarized, free neutrons have been measured. The T-odd, P-odd correlation coefficient quantifying the component perpendicular to the decay plane defined by neutron polarization and electron momentum, was found to be R=0.008 +/- 0.015 +/-0.005. This value is consistent with time reversal invariance, and significantly improves limits on the relative strength of imaginary scalar couplings in the weak interaction. The value obtained for the correlation coefficient associated with the electron polarization component contained within the decay plane N=0.056 +/- 0.011 +/- 0.005, agrees with the Standard Model expectation, providing an important sensitivity test of the experimental setup.
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