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The QCD axion, precisely

Open access
di Cortona, Giovanni Grilli, Hardy, Edward, Vega, Javier Pardo, Villadoro, Giovanni·2016·Journal of High Energy Physics

Abstract

We show how several properties of the QCD axion can be extracted at high precision using only first principle QCD computations. By combining NLO results obtained in chiral perturbation theory with recent Lattice QCD results the full axion potential, its mass and the coupling to photons can be reconstructed with percent precision. Axion couplings to nucleons can also be derived reliably, with uncertainties smaller than ten percent. The approach presented here allows the precision to be further improved as uncertainties on the light quark masses and the effective theory couplings are reduced. We also compute the finite temperature dependence of the axion potential and its mass up to the crossover region. For higher temperature we point out the unreliability of the conventional instanton approach and study its impact on the computation of the axion relic abundance.

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Crossref · 10.1007/jhep01(2016)034

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Metadata

Authors
di Cortona, G. G., Hardy, E., Vega, J. P., & Villadoro, G.
Venue
Journal of High Energy Physics
Published
2016-01
Volume
2016
Issue
1
ISSN
1029-8479 (ISSN-L)
OpenAlex
W2163349752
Cited by
747
References
2
FWCI
27.55
Type
journal article
Language
en
Open access
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