A 160-hour solar tracking campaign with a 7-GridPix detector at CAST found no axion signal and set a new best helioscope limit g_ae*g_aγ < 7.35e-23 GeV^-1 at 95% confidence.
Weinberg,The u(1) problem,Phys
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Search for solar axions produced through the axion-electron coupling $g_{ae}$ using a new GridPix detector at CAST
A 160-hour solar tracking campaign with a 7-GridPix detector at CAST found no axion signal and set a new best helioscope limit g_ae*g_aγ < 7.35e-23 GeV^-1 at 95% confidence.