77226 20250722154010.0 doi 10.1088/1475-7516/2019/01/032 sideral 110550 ART-2019-110550 eng Anastassopoulos, V. Improved search for solar chameleons with a GridPix detector at CAST 2019 Access copy available to the general public Unrestricted 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) less than or similar to 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. info:eu-repo/grantAgreement/EC/FP7/240054/EU/Novel Developments in Time Projection Chambers (TPCs) for Rare Event Searches in Underground Astroparticle EXperiments/TREX info:eu-repo/grantAgreement/ES/MINECO-FEDER/FPA2011-24058 info:eu-repo/grantAgreement/ES/MINECO-FEDER/FPA2013-41085-P info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 5.21 2019 PHYSICS, PARTICLES & FIELDS 5 / 29 = 0.172 2019 Q1 T1 ASTRONOMY & ASTROPHYSICS 13 / 68 = 0.191 2019 Q1 T1 0.813 2019 Astronomy and Astrophysics 2019 Q2 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Aune, S. Barth, K. Belov, A. Brauninger, H. Cantatore, G. Carmona, J.M. Universidad de Zaragoza (orcid)0000-0003-2264-2306 Castel, J.F. Universidad de Zaragoza (orcid)0000-0003-3532-7540 Cetin, S.A. Christensen, F. Dafni, T. Universidad de Zaragoza (orcid)0000-0002-8921-910X Davenport, M. Dermenev, A. Desch, K. Dobrich, B. Eleftheriadis, C. Fanourakis, G. Ferrer-Ribas, E. Fischer, H. Funk, W. Garcia, J.A. (orcid)0000-0002-7399-7353 Gardikiotis, A. Garza, J.G. (orcid)0000-0003-0800-1588 Gazis, E.N. Geralis, T. Giomataris, I. Gninenko, S. Hailey, C.J. Hasinoff, M.D. Hoffmann, D.H.H. Iguaz, F.J. (orcid)0000-0001-6327-9369 Irastorza, I.G. Universidad de Zaragoza (orcid)0000-0003-1163-1687 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. Universidad de Zaragoza (orcid)0000-0002-5352-1884 Maroudas, M. Miceli, L. Neff, S. Ortega, I. Papaevangelou, T. Paraschou, K. Pivovaroff, M.J. Raffelt, G. Rosu, M. Ruz, J. (orcid)0000-0002-3253-7027 Choliz, E.R. Universidad de Zaragoza (orcid)0000-0002-2417-7121 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. 2004 X Universidad de Zaragoza Dpto. Física Teórica Proy. investigación HCA 2004 390 Universidad de Zaragoza Dpto. Física Teórica Área Física Atóm.Molec.y Nucl. 2019, 1 (2019), 032 [18 pp.] J. Cosmol. Astropart. Phys. Journal of Cosmology and Astroparticle Physics 1475-7516 568740 http://zaguan.unizar.es/record/77226/files/texto_completo.pdf Versión publicada 99793 http://zaguan.unizar.es/record/77226/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:77226 articulos driver 2025-07-22-15:35:40 ARTICLE