论文标题
通过用晶格QCD计算拓扑质量贡献，排除无质量的CP问题解决方案
Ruling Out the Massless Up-Quark Solution to the Strong CP Problem by Computing the Topological Mass Contribution with Lattice QCD
论文作者
论文摘要
粒子物理学中臭名昭著的强CP问题原则上可以通过无质量的夸克来解决。特别是，假设拓扑作用可以大大导致观察到的非零夸克质量，而不会重新引入CP违规。另外，通过使用拟合手性扰动理论的拟合，我们通过计算倾斜质量对动态奇怪夸克质量的依赖性来将拓扑质量贡献的强度与直接晶格QCD模拟结合。我们发现，拓扑质量贡献的大小与对强大CP问题的无数夸克解决方案不一致。
The infamous strong CP problem in particle physics can in principle be solved by a massless up quark. In particular, it was hypothesized that topological effects could substantially contribute to the observed nonzero up-quark mass without reintroducing CP violation. Alternatively to previous work using fits to chiral perturbation theory, in this Letter, we bound the strength of the topological mass contribution with direct lattice QCD simulations, by computing the dependence of the pion mass on the dynamical strange-quark mass. We find that the size of the topological mass contribution is inconsistent with the massless up-quark solution to the strong CP problem.
