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arXiv 0812.1202nucl-exhep-phnucl-th
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超允许的0+到0+核β衰变：守恒矢量流假设和标准模型的精确检验的新调查

Superallowed 0+ to 0+ nuclear beta decays: A new survey with precision tests of the conserved vector current hypothesis and the standard model

J. C. Hardy, I. S. Towner

备注：
36 pages, 11 tables, 9 figures
发表信息：
Phys.Rev.C79:055502,2009
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摘要：

本文介绍了与20个0+到0+ β衰变有关的所有半衰期、衰变能和分支比测量的一个新的临界调查。与我们上次的评论相比，有许多改进：首先，我们增加了27个最近发表的测量结果，并删除了9个参考文献;特别重要的是，新数据包括一些高精度的彭宁陷阱测量衰变能量。第二，我们使用了最近改进的同位旋破缺修正。第三，我们对统计速率函数的计算现在考虑了子原子中可能的激发。最后，我们重新检查了与同位旋破缺修正有关的系统不确定性，方法是用Hartree-Fock径向波函数计算径向重叠修正，并将结果与我们以前用Saxon-Woods波函数计算的结果进行比较;因此，系统不确定性的规定已经改变。新修正的Ft值是令人印象深刻的常数，当与μ子寿命结合时，它们的平均值产生Cabibbo-Kobayashi-Maskawa（CKM）矩阵的上下夸克混合元，V_{ud} = 0.97425（22）。矩阵顶行上的酉性检验变为|V_{ud}| ^2个以上|V_{us}| ^2 +| V_{ub}| ^2 = 0.99995（61）。V_{ud}和么正性和与我们以前的调查相比，显著降低了不确定性，尽管V_{ud}的新值在统计上与旧值一致。从这些数据中，我们还对标量相互作用、右手流和额外Z玻色子的可能存在设置了限制。最后，我们讨论了未来的理论和实验工作的优先事项，使CKM酉性测试更加明确的目标。

英文摘要：

A new critical survey is presented of all half-life, decay-energy and branching-ratio measurements related to 20 0+ to 0+ beta decays. Compared with our last review, there are numerous improvements: First, we have added 27 recently published measurements and eliminated 9 references; of particular importance, the new data include a number of high-precision Penning-trap measurements of decay energies. Second, we have used the recently improved isospin symmetry-breaking corrections. Third, our calculation of the statistical rate function now accounts for possible excitation in the daughter atom. Finally, we have re-examined the systematic uncertainty associated with the isospin symmetry-breaking corrections by evaluating the radial-overlap correction using Hartree-Fock radial wave functions and comparing the results with our earlier calculations, which used Saxon-Woods wave functions; the provision for systematic uncertainty has been changed as a consequence. The new corrected Ft values are impressively constant and their average, when combined with the muon liftime, yields the up-down quark-mixing element of the Cabibbo-Kobayashi-Maskawa (CKM) matrix, V_{ud} = 0.97425(22). The unitarity test on the top row of the matrix becomes |V_{ud}|^2 + |V_{us}|^2 + |V_{ub}|^2 = 0.99995(61). Both V_{ud} and the unitarity sum have significantly reduced uncertainties compared with our previous survey, although the new value of V_{ud} is statistically consistent with the old one. From these data we also set limits on the possible existence of scalar interactions, right-hand currents and extra Z bosons. Finally, we discuss the priorities for future theoretical and experimental work with the goal of making the CKM unitarity test even more definitive.

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