Improved search for solar chameleons with a GridPix detector at CAST

Anastassopoulos, V.; Aune, S.; Barth, K.; Belov, A.; Bräuninger, H.; Cantatore, G.; Carmona, J.M.; Castel, J.F.; Cetin, S.A.; Christensen, F.; Dafni, T.; Davenport, M.; Dermenev, A.; Desch, K.; Döbrich, B.; Eleftheriadis, C.; Fanourakis, G.; Ferrer-Ribas, E.; Fischer, H.; Funk, W.; Garcboldimatha, J.A.; Gardikiotis, A.; Garza, J.G.; Gazis, E.N.; Geralis, T.; Giomataris, I.; Gninenko, S.; Hailey, C.J.; Hasinoff, M.D.; Hoffmann, D.H.H.; Iguaz, F.J.; Irastorza, I.G.; Jakobsen, A.; Jacoby, J.; Jakovčić, K.; Kaminski, J.; Karuza, M.; Kostoglou, S.; Kralj, N.; Krčmar, M.; Krieger, C.; Lakić, B.; Laurent, J. M.; Liolios, A.; Ljubičić, A.; Luzón, G.; Maroudas, M.; Miceli, L.; Neff, S.; Ortega, I.; Papaevangelou, T.; Paraschou, K.; Pivovaroff, M.J.; Raffelt, G.; Rosu, M.; Ruz, J.; Ruiz Chóliz, E.; Savvidis, I.; Schmidt, S.; Semertzidis, Y.K.; Solanki, Sami K.; Stewart, L.; Vafeiadis, T.; Vogel, J.K.; Vretenar, M.; Wuensch, W.; Yildiz, S.C.; Zioutas, K.; Brax, P.

doi:10.1088/1475-7516/2019/01/032

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Improved search for solar chameleons with a GridPix detector at CAST

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Solanki, Sami K.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Citation

Anastassopoulos, V., Aune, S., Barth, K., Belov, A., Bräuninger, H., Cantatore, G., et al. (2019). Improved search for solar chameleons with a GridPix detector at CAST. Journal of Cosmology and Astroparticle Physics, 2019(1): 032. doi:10.1088/1475-7516/2019/01/032.

Cite as: https://hdl.handle.net/21.11116/0000-0006-5BB4-9

Abstract

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 significant 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, β γ ∼#5.7×10 10 for 1<β 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 T.