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Improved search for solar chameleons with a GridPix detector at CAST

(CAST Collaboration) Anastassopoulos, V; Aune, S.; Barth, K.; Belov, A.; Braueninger, H.; Cantatore, G.; Carmona, J. M.; Castel, J. F.; Cetin, S. A.; Christensen, F.; Dafni, T.; Davenport, M.; Dermenev, A.; Desch, K.; Doebrich, B.; Eleftheriadis, C.; Fanourakis, G.; Ferrer-Ribas, E.; Fischer, H.; Funk, W.; Garcia, 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.; Jakovcic, K.; Kaminski, J.; Karuza, M.; Kostoglou, S.; Kralj, N.; Krcmar, M.; Krieger, C.; Lakic, B.; Laurent, J. M.; Liolios, A.; Ljubicic, A.; Luzon, G.; Maroudas, M.; Miceli, L.; Neff, S.; Ortega, I; Papaevangelou, T.; Paraschou, K.; Pivovaroff, M. J.; Raffelt, G.; Rosu, M.; Ruz, J.; Ruiz Choliz, E.; Savvidis, I; Schmidt, S.; Semertzidis, Y. K.; Solanki, S. K.; Stewart, L.; Vafeiadis, T.; Vogel, J. K.; Vretenar, M.; Wuensch, W.; Yildiz, S. C.; Zioutas, K.; Brax, P.; (2019) Improved search for solar chameleons with a GridPix detector at CAST. Journal of cosmology and astroparticle physics, 2019 (01). ISSN 1475-7516

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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 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, beta_{; ; ; gamma}; ; ; < 5.7 x 10^(10) for 1 < beta_{; ; ; 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.

Item Type: Article
Uncontrolled Keywords: dark energy experiments ; modified gravity ; particle physics - cosmology connection ; solar physics
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Experimental Physics
Project titleProject leaderProject codeProject type
Potraga za kasiomima i njima sličnim česticama-SAALPBiljana LakićIP-2014-09-3720HRZZ
Depositing User: Ante Ljubičić
Date Deposited: 03 Jul 2019 12:47
DOI: 10.1088/1475-7516/2019/01/032

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