QCD $\theta$-vacuum energy and axion properties

@article{Lu2020QCDE,
  title={QCD \$\theta\$-vacuum energy and axion properties},
  author={Zhen-Yan Lu and Menglin Du and Feng-Kun Guo and Ulf-G. Meissner and Thomas Vonk},
  journal={arXiv: High Energy Physics - Phenomenology},
  year={2020}
}
  • Zhen-Yan Lu, Menglin Du, +2 authors Thomas Vonk
  • Published 2020
  • Physics
  • arXiv: High Energy Physics - Phenomenology
  • At low energies, the strong interaction is governed by the Goldstone bosons associated with the spontaneous chiral symmetry breaking, which can be systematically described by chiral perturbation theory. In this paper, we apply this theory to study the $\theta$-vacuum energy density and hence the QCD axion potential up to next-to-leading order with $N$ non-degenerate quark masses. By setting $N=3$, we then derive the axion mass, self-coupling, topological susceptibility and the normalized fourth… CONTINUE READING

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