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Kinematic sensitivity to the Fierz term of beta-decay differential spectra

机译:对β-衰减差分光谱的益频术语的运动敏感性

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摘要

The current most stringent constraints on exotic scalar or tensor couplings in neutron and nuclear beta decay, involving left-handed neutrinos, are obtained from the Fierz interference term. The sensitivity to this term in a correlation coefficient is usually driven by an energy-averaged kinematic factor that increases monotonically toward smaller values of the beta endpoint energies. We first point out here that this property does not hold for certain differential observables that are directly sensitive to the Fierz term, such as the beta or the recoil energy spectrum. This observation is relevant for the selection of sensitive transitions in searches for exotic couplings through spectrum shape measurements. We then point out previous errors in the exploitation of measurements of the beta-upsilon angular correlation coefficient and discuss their impact on the extraction of constraints on exotic couplings.
机译:目前的最严格约束在中子和核β衰减中的异国标量或张力耦合,涉及左手中微子,从益尔兹干扰项获得。 在相关系数中对该术语的敏感性通常由能量平均运动因子驱动,该运动因子可以单调地增加较小的β终点能量的值。 我们首先指出,此属性不适用于对Fierz项直接敏感的某些差异可观察,例如β或反冲能谱。 该观察与通过光谱形状测量搜索外来耦合的搜索中的敏感过渡的选择是相关的。 然后,我们在利用β - upsilon角度相关系数的测量中指出了先前的误差,并讨论了它们对异国耦合限制的影响。

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