CAST constraints on the axion-electron coupling

CAST constraints on the axion-electron coupling

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 der...

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Veröffentlicht in:Journal of cosmology and astroparticle physics 2013-05, Vol.2013 (5)
Hauptverfasser: Barth, K., Belov, A., Beltran, B., Bräuninger, H., Carmona, J. M., Collar, J. I., Dafni, T., Davenport, M., Lella, L. Di, Eleftheriadis, C., Englhauser, J., Fanourakis, G., Ferrer-Ribas, E., Fischer, H., Franz, J., Friedrich, P., Galán, J., García, J. A., Geralis, T., Giomataris, I., Gninenko, S., Gómez, H., Hasinoff, M. D., Heinsius, F. H., Hoffmann, D. H.H, Irastorza, I. G., Jacoby, J., Jakovčić, K., Kang, D., Königsmann, K., Kotthaus, R., Kousouris, K., Krčmar, M., Kuster, M., Lakić, B., Liolios, A., Ljubičić, A., Lutz, G., Luzón, G., Miller, D. W., Papaevangelou, T., Pivovaroff, M. J., Raffelt, G., Redondo, J., Riege, H., Rodríguez, A., Ruz, J., Savvidis, I., Semertzidis, Y., Stewart, L., Bibber, K. Van, Vieira, J. D., Villar, J. A., Vogel, J. K., Walckiers, L., Zioutas, K.
Format: Artikel
Sprache:eng
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ASTRONOMY AND ASTROPHYSICS
axions
helioscopes
magnetic fields
sun
white dwarfs
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Zusammenfassung: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 gae and axion-photon interaction strength gaγ using the CAST phase-I data (vacuum phase). For ma ≲ 10 meV/c2 we find gaγ gae < 8.1 × 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.
ISSN:1475-7516
1475-7516