This version contains minor modifications to several sections to clarify some fine points. Also, several references have been added. 24 pages, 7 figures
We reconsider parity violation experiments in atomic hydrogen and deuterium in the light of existing tests of the Electroweak interactions, and assess whether new experiments, using improved experimental techniques, could make useful contributions to testing the Standard Model (SM). We find that, if parity experiments in hydrogen can be done, they remain highly desirable because there is negligible atomic-physics uncertainty and low energy tests of weak neutral current interactions are needed to probe for new physics beyond the SM. Of particular interest would be a measurement of the nuclear spin independent coupling C_{1D} for the deuteron at a combined error (theory + experiment) of 0.3%. This would provide a factor of three improvement to the precision on sin^2 theta_W at very low momentum transfer provided by heavy atom Atomic Parity Violation (APV) experiments. Also, experiments in H and D could provide precise measurements of three other electron-nucleon, weak-neutral-current coupling constants: C_{1p}, C_{2p},and C_{2D}, which have not been accurately determined to date. Analysis of a generic APV experiment in deuterium indicates that a 0.3% measurement of C_{1D} requires development of a slow (77K) metastable beam of ~ 5x10^14 D(2S) s^-1 per hyperfine component. The advent of UV radiation from free electron laser (FEL) technology could allow production of such a beam.
On-shell renormalization of neutralino and chargino mass matrices in R-parity violating models - Correlation between LSP decays and neutrino mixing angles revisited
在轻子数自发破缺的模型中，出现了无质量的戈德斯通玻色子--Majoron（$J$）。在R宇称自发破缺的超对称模型中，计算了发射带电轻子衰变Br（$μ\to e J$）和Br（$μ\to e J γ$）的Majoron分支比的理论允许范围. Br（$μ\to eJ$）在最轻的中性伴子衰变主要是不可见的参数空间的同一区域中是最大的。因此，Br（$μ\to eJ$）的测量潜在地提供了与加速器搜索互补的关于R奇偶违反的信息。我们还简要地讨论了现有的界限和未来的改进带电轻子的Majoron耦合的前景。
