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arXiv 1005.0797hep-ph
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来自原子宇称破坏和中微子散射的电弱约束

Electroweak Constraints from Atomic Parity Violation and Neutrino Scattering

Timothy Hobbs, Jonathan L. Rosner

摘要:

精确的电弱物理学可以为揭示标准模型(SM)之外的新物理学提供肥沃的土壤。新物理学可能出现的一个领域是所谓的“倾斜修正”,即,对应于真空极化的玻色子传播子的次领先阶展开。人们可以用区分同位旋守恒和非守恒的量$S$和$T$来参数化它们的影响。这提供了一种方法,比较精密电弱实验对新物理学的约束的相对贡献。考虑到强$T$敏感实验的普遍性,迫切需要对$S$的进一步约束,例如由重原子上的原子宇称违反实验提供的约束。我们评估的约束$S$所产生的最近改进的计算中的Cs原子。我们表明,顶夸克质量$m_t$提供严格的限制$S$的上下文中的标准模型。我们还考虑了下一代中微子散射实验对改进$(S,T)$约束的潜在贡献。

英文摘要:

Precision electroweak physics can provide fertile ground for uncovering new physics beyond the Standard Model (SM). One area in which new physics can appear is in so-called "oblique corrections", i.e., next-to-leading order expansions of bosonic propagators corresponding to vacuum polarization. One may parametrize their effects in terms of quantities $S$ and $T$ that discriminate between conservation and non-conservation of isospin. This provides a means of comparing the relative contributions of precision electroweak experiments to constraints on new physics. Given the prevalence of strongly $T$-sensitive experiments, there is an acute need for further constraints on $S$, such as provided by atomic parity-violating experiments on heavy atoms. We evaluate constraints on $S$ arising from recently improved calculations in the Cs atom. We show that the top quark mass $m_t$ provides stringent constraints on $S$ within the context of the Standard Model. We also consider the potential contributions of next-generation neutrino scattering experiments to improved $(S,T)$ constraints.

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