论文标题
风味异常，中微子质量和轴轴之间的连接
A connection between flavour anomaly, neutrino mass, and axion
论文作者
论文摘要
我们提出了一个最小模型，其中$ b \ tosμ^+μ^ - $转换中的风味异常与peccei-quinn（pq）对称性的破裂有关。风味异常是通过新物理贡献来解释的，它引入了一代重型夸克和重物轻子，它们在标准型号（SM）量规组下类似于矢量，但在本地$ U（1）_x $ group下被收取。它们与Sm夸克和叶子混合在一起，诱导改变风味的$ z^\ prime $耦合，从而在树级生成$ b \ tosμ^+μ^ - $异常。另一方面，在全球peccei-Quinn（PQ）对称性下，新的费米子是手性的。来自PQ对称性的自发断裂的伪金石玻色子成为斧头，解决了强大的CP问题并提供了冷的暗物质候选者。相同的对称性阻止了右手中微子具有Majorana质量术语。但是，引入中微子特异性的Higgs Doublet允许中微子具有零dirac的质量术语而不会进行微调问题。该模型显示了轴，中微子，暗物质和风味物理学之间的相互作用。
We propose a minimal model in which the flavour anomaly in the $b \to s μ^+ μ^-$ transition is connected to the breaking of Peccei-Quinn (PQ) symmetry. The flavour anomaly is explained from new physics contribution by introducing one generation of heavy quark and heavy lepton which are vector-like under the standard model (SM) gauge group but charged under a local $U(1)_X$ group. They mix with the SM quarks and leptons, inducing flavour-changing $Z^\prime$ couplings, which generates the $b \to s μ^+μ^-$ anomaly at tree level. On the other hand the new fermions are chiral under the global Peccei-Quinn(PQ) symmetry. The pseudo-Goldstone boson coming from the spontaneous breaking of the PQ symmetry becomes an axion, solving the strong CP problem and providing a cold dark matter candidate. The same symmetry prevents the right-handed neutrino from having a Majorana mass term. But the introduction of a neutrino-specific Higgs doublet allows neutrino to have Dirac mass term without fine-tuning problem. The model shows an interplay between axion, neutrino, dark matter, and flavour physics.
