手征$U(1)_{B-L}$轴子模型中的质量耦合关系
A quality-coupling relation in chiral $U(1)_{B-L}$ axion model
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中文总结 AI 辅助
本研究构建手征$U(1)_{B-L}$轴子模型，利用复标量真空期望值破缺对称性，推导轴子与规范玻色子、SM费米子的耦合关系，扩展QCD轴子参数空间以提升可检验性。
中文摘要 AI 辅助
QCD轴子的质量可由规范对称性保护，本研究考虑了一种规范的手征$U(1)_{B-L}$对称性。两个复标量的真空期望值会破坏$U(1)_{B-L}$对称性，它们的两个相位自由度的线性组合中，一个被$U(1)_{B-L}$规范玻色子吸收，另一个成为QCD轴子。由于PQ对称性是偶然的，PQ电荷分配不存在歧义。高轴子质量意味着轴子与$U(1)_{B-L}$规范玻色子（或规范Majoron）之间存在大的反常耦合，轴子与SM费米子的耦合会出现一个由轴子质量决定的最小耦合（即“质量下限”），这扩展了QCD轴子的参数空间，提升了其可检验性。
英文摘要
The quality of the QCD axion can be protected by a gauge symmetry. This work considers a gauged chiral $U(1)_{B-L}$. The vacuum expectation values of two complex scalars break $U(1)_{B-L}$. One linear combination of their two phase degrees of freedom is eaten by the $U(1)_{B-L}$ gauge boson, while the other becomes the QCD axion. Since the PQ symmetry is accidental, there is no ambiguity in the PQ charge assignment. High axion quality implies a large anomalous coupling between the axion and the $U(1)_{B-L}$ gauge boson (or gauged Majoron). A `quality floor', namely a minimal coupling determined by the axion quality, arises for the coupling between the axion and SM fermions, extending the parameter space of QCD axions toward improved testability.
