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CAST constraints on the axion-electron coupling

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arxiv 1302.6283 v2 pith:5W2TWYBV submitted 2013-02-26 astro-ph.SR hep-ph

K. Barth , A. Belov , B. Beltran , H. Brauninger , J. M. Carmona , J.I. Collar , T. Dafni , M. Davenport
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L. Di Lella C. Eleftheriadis J. Englhauser G. Fanourakis E. Ferrer Ribas H. Fischer J. Franz P. Friedrich J. Galan J. A. Garcia T. Geralis I. Giomataris S. Gninenko H. Gomez M. D. Hassinoff F. H. Heinsius D. H. H. Hoffmann I.G. Irastorza J. Jacoby K. Jakovcic D. Kang K. Konigsmann R. Kotthaus K. Kousouris M. Krcmar M. Kuster B. Lakic A. Liolios A. Ljubicic G. Lutz G. Luzon D.W. Miller T. Papaevangelou M.J. Pivovaroff G. Raffelt J. Redondo H. Riege A. Rodriguez J. Ruz I. Savvidis Y. Semertzidis L. Stewart K. Van Bibber J.D. Vieira J.A. Villar J.K. Vogel L. Walckiers K. Zioutas
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classification astro-ph.SRhep-ph
keywords axionaxion-electronaxio-recombinationcastcouplingfluxinteractionlimits
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In non-hadronic axion models, which have a tree-level axion-electron interaction, the Sun produces a strong axion flux by bremsstrahlung, Compton scattering, and axio-recombination, the "BCA processes." Based on a new calculation of this flux, including for the first time axio-recombination, we derive limits on the axion-electron Yukawa coupling g_ae and axion-photon interaction strength g_ag using the CAST phase-I data (vacuum phase). For m_a < 10 meV/c2 we find g_ag x g_ae< 8.1 x 10^-23 GeV^-1 at 95% CL. We stress that a next-generation axion helioscope such as the proposed IAXO could push this sensitivity into a range beyond stellar energy-loss limits and test the hypothesis that white-dwarf cooling is dominated by axion emission.

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  1. Experiments to test the hypothesis for solar and dark matter axions

    hep-ph 2025-07 unverdicted novelty 1.0 of 10

    This is a pedagogical review of haloscope and helioscope experiments searching for dark matter and solar axions, with an overview of near-future technological developments.

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