%0 Journal Article
%T CAST constraints on the axion-electron coupling
%A K. Barth
%A A. Belov
%A B. Beltran
%A H. Brauninger
%A J. M. Carmona
%A J. I. Collar
%A T. Dafni
%A M. Davenport
%A L. Di Lella
%A C. Eleftheriadis
%A J. Englhauser
%A G. Fanourakis
%A E. Ferrer Ribas
%A H. Fischer
%A J. Franz
%A P. Friedrich
%A J. Galan
%A J. A. Garcia
%A T. Geralis
%A I. Giomataris
%A S. Gninenko
%A H. Gomez
%A M. D. Hassinoff
%A F. H. Heinsius
%A D. H. H. Hoffmann
%A I. G. Irastorza
%A J. Jacoby
%A K. Jakovcic
%A D. Kang
%A K. Konigsmann
%A R. Kotthaus
%A K. Kousouris
%A M. Krcmar
%A M. Kuster
%A B. Lakic
%A A. Liolios
%A A. Ljubicic
%A G. Lutz
%A G. Luzon
%A D. W. Miller
%A T. Papaevangelou
%A M. J. Pivovaroff
%A G. Raffelt
%A J. Redondo
%A H. Riege
%A A. Rodriguez
%A J. Ruz
%A I. Savvidis
%A Y. Semertzidis
%A L. Stewart
%A K. Van Bibber
%A J. D. Vieira
%A J. A. Villar
%A J. K. Vogel
%A L. Walckiers
%A K. Zioutas
%J Physics
%D 2013
%I arXiv
%R 10.1088/1475-7516/2013/05/010
%X 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.
%U http://arxiv.org/abs/1302.6283v2