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arXiv 0909.5101hep-phhep-lat
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反常与离散手征对称性

Anomalies and discrete chiral symmetries

Michael Creutz

摘要:

打破无质量多味QCD的U(1)轴对称性的量子反常留下了离散的味单重手征不变性。对于有质量的夸克,这种剩余对称性与强CP破坏参数θ有着密切的联系。一个结果是,如果最轻的夸克是简并的,那么当θ通过π时,就会发生一级跃迁。由此产生的框架有助于澄清,当生根处方外推的口味数量是有效的。

英文摘要:

The quantum anomaly that breaks the U(1) axial symmetry of massless multi-flavored QCD leaves behind a discrete flavor-singlet chiral invariance. With massive quarks, this residual symmetry has a close connection with the strong CP-violating parameter theta. One result is that if the lightest quarks are degenerate, then a first order transition will occur when theta passes through pi. The resulting framework helps clarify when the rooting prescription for extrapolating in the number of flavors is valid.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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