Journal Article

FZJ-2021-00159

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png QCD θ-vacuum energy and axion properties

Lu, Z.-Y. (Corresponding author) ; Du, M.-L. ; Guo, F.-K. ; Meißner, U.-G.FZJ* ; Vonk, T.

2020
SISSA [Trieste]

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Please use a persistent id in citations: http://hdl.handle.net/2128/26727  doi:10.1007/JHEP05(2020)001

Abstract: 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 θ-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 cumulant both analytically and numerically, taking the strong isospin breaking effects into account. In addition, the model-independent part of the axion-photon coupling, which is important for axion search experiments, is also extracted from the chiral Lagrangian supplemented with the anomalous terms up to O(p6).

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Contributing Institute(s):

1. Theorie der Starken Wechselwirkung (IAS-4)
2. Theorie der starken Wechselwirkung (IKP-3)

Research Program(s):

1. 511 - Computational Science and Mathematical Methods (POF3-511) (POF3-511)
2. DFG project 196253076 - TRR 110: Symmetrien und Strukturbildung in der Quantenchromodynamik (196253076) (196253076)

Appears in the scientific report 2020

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