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High Energy Physics - Phenomenology

arXiv:2010.15846 (hep-ph)
[Submitted on 29 Oct 2020 (v1), last revised 1 Feb 2021 (this version, v2)]

Title:Selective enhancement of the QCD axion couplings

Authors:Luc Darmé, Luca Di Luzio, Maurizio Giannotti, Enrico Nardi
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Abstract:We present a mechanism wherein the QCD axion coupling to nucleons, photons, or electrons, can be enhanced selectively without increasing the axion mass. We focus in particular on the axion-nucleon couplings, that are generally considered to be largely model-independent, and we show how nucleophilic axion models can be constructed. We discuss the implications of a nucleophilic axion for astrophysics, cosmology and laboratory searches. We present a model with enhanced axion couplings to nucleons and photons that can provide an excellent fit to the anomalous emission of hard X-rays recently observed from a group of nearby neutron stars, and we argue that such a scenario can be thoroughly tested in forthcoming axion-search experiments.
Comments: 14 pages, 4 figures. Matches version published in Phys.Rev.D
Subjects: High Energy Physics - Phenomenology (hep-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO); Astrophysics of Galaxies (astro-ph.GA); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics - Experiment (hep-ex)
Report number: DESY 20-177
Cite as: arXiv:2010.15846 [hep-ph]
  (or arXiv:2010.15846v2 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.2010.15846
arXiv-issued DOI via DataCite
Journal reference: Phys. Rev. D 103, 015034 (2021)
Related DOI: https://doi.org/10.1103/PhysRevD.103.015034
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Submission history

From: Luc Darmé [view email]
[v1] Thu, 29 Oct 2020 18:00:03 UTC (729 KB)
[v2] Mon, 1 Feb 2021 08:50:45 UTC (757 KB)
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