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 |
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| container_title | Journal of cosmology and astroparticle physics |
| container_volume | 2013 |
| creator | Barth, K Belov, A Beltran, B Brauninger, H Carmona, J M Collar, J I Dafni, T Davenport, M Di Lella, L Eleftheriadis, C |
| description | 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. |
| doi_str_mv | 10.1088/1475-7516/2013/05/010 |
| format | Article |
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| source | IOP Publishing Journals; Institute of Physics (IOP) Journals - HEAL-Link |
| subjects | axions Bremsstrahlung Cosmology dark matter experiments Elastic scattering Emission analysis Emissions control Flux Joining Mathematical models PHYSICS OF ELEMENTARY PARTICLES AND FIELDS solar physics Sun white and brown dwarfs |
| title | CAST constraints on the axion-electron coupling |
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