doi:10.1016/j.physletb.2015.07.049engAnastassopoulos,V.Arik, M.Aune, S.Barth, K.Belov, A.Bräuninger, H.Cantatore, G.Carmona Martínez, José ManuelCetin, S.A.Christensen, F.Collar, J.I.Dafni , TheopistiDavenport, M.Desch, K.Dermenev, A.Eleftheriadis, C.Fanourakis, G.Ferrer-Ribas, E.Friedrich, P.Galán, J.García Pascual, Juan AntonioGardikiotis, A.Gracia Garza, JavierGazis, E.N.Geralis, T.Giomataris, I.Hailey, C.Haug, F.Hasinoff, M.D.Hoffmann, D.H.H.Iguaz Gutiérrez, Francisco JoséGarcía Irastorza, IgorJacoby, J.Jakobsen, A.Jakovcic, K.Kaminski, J.Karuza, M.Kavuk, M.Krcmar, M.Krieger, C.Krüger, A.Lakic, B.Laurent, J.M.Liolios, A.Ljubicic, A.Luzón Marco, GloriaNeff, S.Ortega, I.Papaevangelou, T.Pivovaroff, M.J.Raffelt, G.Riege, H.Rosu, M.Ruz, J.Savvidis, I.Solanki, S.K.Vafeiadis, T.Villar Rivacoba, José ÁngelVogel, J.K.Yildiz, S.C.Zioutas, K.Brax, P.Lavrentyev, I.Upadhye, A.Search for chameleons with CASTART-2015-91105In this work we present a search for (solar) chameleons with the CERN Axion Solar Telescope (CAST). This novel experimental technique, in the field of dark energy research, exploits both the chameleon coupling to matter (ßm) and to photons (ß¿) via the Primakoff effect. By reducing the X-ray detection energy threshold used for axions from 1keV to 400eV CAST became sensitive to the converted solar chameleon spectrum which peaks around 600eV. Even though we have not observed any excess above background, we can provide a 95% C.L. limit for the coupling strength of chameleons to photons of ß¿¿1011 for 1<ßm<106.2015http://zaguan.unizar.es/record/3278610.1016/j.physletb.2015.07.049http://zaguan.unizar.es/record/32786oai:zaguan.unizar.es:32786info:eu-repo/grantAgreement/EUR/EIC-CERN-2011-0006info:eu-repo/grantAgreement/EUR/FP7/PITN-GA-2011-289442info:eu-repo/grantAgreement/EUR/FP7/ERC2009-StG-240054info:eu-repo/grantAgreement/ES/MINECO-FEDER/FPA2008-03456info:eu-repo/grantAgreement/ES/MINECO-FEDER/FPA2011-24058PHYSICS LETTERS B 749 (2015), 172-180byhttp://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccess