Charge symmetry of weak interactions
Charge symmetry of weak interactions
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弱相互作用的电荷对称性
DOI：
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发表时间：
1958
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影响因子：
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通讯作者：
S. Weinberg
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文献类型：
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作者：
S. Weinberg
G 下强相互作用的不变性（电荷对称性和电荷共轭的产物）对于奇异性守恒轻子相互作用具有重要影响。根据强相互作用电流的G变换性质，我们可以将主要的弱相互作用分为两类。第一类包括传统的核子-轻子费米相互作用，并且是唯一有助于β衰变耦合常数的类。第二类相互作用存在的明确检验包括：(a) mu 吸收中的诱导标量项，(b) B/sup 12/ 和 N/sup 12/ 或 Li/sup 8/ 和 B/sup 8/ beta 衰减中某些小修正项的不等式，以及 (c) SIGMA 正负率的不等式 - 产生 LAMBDA /sup O/ + e/sup +/ + nu 。不存在第二类相互作用将表明同位素自旋和弱相互作用之间存在深刻的关系；例如，最近的 Feynman-GellMann 理论预测所有向量弱相互作用都是一流的。第二类相互作用的存在意味着通常的费米相互作用是不够的，必须用涉及奇异粒子的项来补充。还对 (l-, nu -bar) 和 (l/sup +/, nu ) 过程之间的关系进行了一些一般性评论，并且我们通过以下有用的定理得出结论：在任何对两个轻子进行相同处理并且没有测量宇称不守恒效应的实验中，V 和 A 之间不会发生干扰，前提是我们可以忽略轻子的质量和电荷。 （授权）« 少
The Invariance of strong interactions under G, the product of charge symmetry and charge conjugation, has important consequences for strangeness- conserving lepton interactions. According to the G-transformation properties of the strongly interacting currents, we may divide the primary weak interactions into two classes. The first class includes the conventional nucleon-lepton Fermi interaction, and is the only class that contributes to the beta -decay coupling constants. Unambiguous tests for the existence of second-class interactions include: (a) induced scalar term In mu absorption, (b) inequality of certain small correction terms in B/sup 12/ and N/sup 12/, or in Li/sup 8/ and B/sup 8/ beta decay, and (c) Inequality in rates of SIGMA plus or minus - yields LAMBDA /sup O/ + e/sup +/ + nu . Absence of second-class interactions would indicate a deep relation between isotopic spin and weak interactions; for example, the recent Feynman-GellMann theory predicts that all vector weak interactions are first class. The presence of second-class interactions would mean that the usual Fermi interaction is insufficient, and must be supplemented by terms involving strange particles. Some general remarks are also made about the relations between (l-, nu -bar) and (l/sup +/, nu ) processes, and we prcve themore » following useful theorem: no interference between V and A may occur in any experiment which treats both leptons identically and in which no parity nonconservation effects are measured, pro viding that we may neglect the mass and charge of the leptons. (auth)« less