论文标题
小型Instantons和Composite Higgs模型中的强大CP问题
Small instantons and the strong CP problem in composite Higgs models
论文作者
论文摘要
我们表明，QCD Instantons可以在利用部分合成性的标准复合希格斯模型中的紫外线中在较小的尺度上产生巨大效果。这对于这些模型中强CP问题的可能解决方案具有重要意义。首先，我们表明，在最简单的复合希格斯模型的紫外线完成中，如果也存在轴，它的质量可能比通常的QCD轴大得多。没有轴是不存在轴的情况，可以通过完全从Instantons的贡献中产生UP Quark质量来解决强大的CP问题，从而为这些模型恢复了无数的夸克解决方案。在这两种情况下，除了实现部分综合所需的需要外，不需要其他字段内容。
We show that QCD instantons can generate large effects at small length scales in the ultraviolet in standard composite Higgs models that utilise partial compositeness. This has important implications for possible solutions of the strong CP problem in these models. First we show that in the simplest known UV completions of composite Higgs models, if an axion is also present, it can have a mass much larger than the usual QCD axion. Even more remarkable is the case where there are no axions, but the strong CP problem can be solved by generating the up quark mass entirely from the contribution of instantons thus reviving the massless up-quark solution for these models. In both cases no additional field content is required apart from what is required to realise partial compositeness.
