Improved Search for Solar Chameleons with a GridPix Detector at CAST

V. Anastassopoulos , S. Aune , K. Barth , A. Belov , H. Br\"auninger , G. Cantatore , J. M. Carmona , J. F. Castel

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S. A. Cetin F. Christensen T. Dafni M. Davenport A. Dermenev K. Desch B. D\"obrich C. Eleftheriadis G. Fanourakis E. Ferrer-Ribas H. Fischer W. Funk J. A. Garc\'ia A. Gardikiotis J. G. Garza E. N. Gazis T. Geralis I. Giomataris S. Gninenko C. J. Hailey M. D. Hasinoff D. H. H. Hoffmann F. J. Iguaz I. G. Irastorza A. Jakobsen J. Jacoby K. Jakov\v{c}i\'c J. Kaminski M. Karuza S. Kostoglou N. Kralj M. Kr\v{c}mar C. Krieger B. Laki\'c J. M. Laurent A. Liolios A. Ljubi\v{c}i\'c G. Luz\'on M. Maroudas L. Miceli S. Neff I. Ortega T. Papaevangelou K. Paraschou M. J. Pivovaroff G. Raffelt M. Rosu J. Ruz E. Ruiz Ch\'oliz I. Savvidis S. Schmidt Y. K. Semertzidis S. K. Solanki L. Stewart T. Vafeiadis J. K. Vogel M. Vretenar W. Wuensch S. C. Yildiz K. Zioutas (CAST Collaboration) P. Brax

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classification ✦ hep-ex physics.ins-det

keywords solarchameleonssearchbetacastdetectorgridpiximproved

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We report on a new search for solar chameleons with the CERN Axion Solar Telescope (CAST). A GridPix detector was used to search for soft X-ray photons in the energy range from 200 eV to 10 keV from converted solar chameleons. No signiffcant excess over the expected background has been observed in the data taken in 2014 and 2015. We set an improved limit on the chameleon photon coupling, $\beta_\gamma < 5.7\times10^{10}$ for $1<\beta_\mathrm{m}<10^6$ at 95% C.L. improving our previous results by a factor two and for the first time reaching sensitivity below the solar luminosity bound for tachocline magnetic fields up to $12.5\,\mathrm{T}$.

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Probing Solar Symmetrons with Direct Detection
hep-ph 2026-04 unverdicted novelty 7.0

Solar tachocline production of symmetrons yields a keV-scale flux at Earth whose absorption in xenon detectors provides new complementary bounds on symmetron parameter space.