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-recombinatio...

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Veröffentlicht in:Journal of cosmology and astroparticle physics 2013-05, Vol.2013 (5), p.i-15
Hauptverfasser: Barth, K, Belov, A, Beltran, B, Brauninger, H, Carmona, J M, Collar, J I, Dafni, T, Davenport, M, Di Lella, L, Eleftheriadis, C
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Sprache:eng
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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 g sub(ae) and axion-photon interaction strength g sub(a[gamma]) using the CAST phase-I data (vacuum phase). For m sub(a) [< ~] 10 meV/c super(2) we find g sub(a[gamma]) g sub(ae) < 8.1 x 10 super(-23) GeV super(-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
DOI:10.1088/1475-7516/2013/05/010