CAST constraints on the axion-electron coupling
Solar and Stellar Astrophysics
2015-02-02 v2 High Energy Physics - Phenomenology
Abstract
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.
Keywords
Cite
@article{arxiv.1302.6283,
title = {CAST constraints on the axion-electron coupling},
author = {K. Barth and A. Belov and B. Beltran and H. Brauninger and J. M. Carmona and J. I. Collar and T. Dafni and M. Davenport and L. Di Lella and C. Eleftheriadis and J. Englhauser and G. Fanourakis and E. Ferrer Ribas and H. Fischer and J. Franz and P. Friedrich and J. Galan and J. A. Garcia and T. Geralis and I. Giomataris and S. Gninenko and H. Gomez and M. D. Hassinoff and F. H. Heinsius and D. H. H. Hoffmann and I. G. Irastorza and J. Jacoby and K. Jakovcic and D. Kang and K. Konigsmann and R. Kotthaus and K. Kousouris and M. Krcmar and M. Kuster and B. Lakic and A. Liolios and A. Ljubicic and G. Lutz and G. Luzon and D. W. Miller and T. Papaevangelou and M. J. Pivovaroff and G. Raffelt and J. Redondo and H. Riege and A. Rodriguez and J. Ruz and I. Savvidis and Y. Semertzidis and L. Stewart and K. Van Bibber and J. D. Vieira and J. A. Villar and J. K. Vogel and L. Walckiers and K. Zioutas},
journal= {arXiv preprint arXiv:1302.6283},
year = {2015}
}