Improved search for solar chameleons with a GridPix detector at CAST

V. Anastassopoulos; S. Aune; K. Barth; A. Belov; H. Bräuninger; G. Cantatore; J.M. Carmona; J.F. Castel; S.A. Cetin; F. Christensen; T. Dafni; M. Davenport; A. Dermenev; K. Desch; B. Döbrich; C. Eleftheriadis; G. Fanourakis; E. Ferrer-Ribas; H. Fischer; W. Funk; J.A. Garc𝚤a; 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. Jakovčić; J. Kaminski; M. Karuza; S. Kostoglou; N. Kralj; M. Krčmar; C. Krieger; B. Lakić; J. M. Laurent; A. Liolios; A. Ljubičić; G. Luzón; M. Maroudas; L. Miceli; S. Neff; I. Ortega; T. Papaevangelou; K. Paraschou; M.J. Pivovaroff; G. Raffelt; M. Rosu; J. Ruz; E. Ruiz Chóliz; 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; P. Brax

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

Journal of Cosmology and Astroparticle Physics

The following article is Open access

Improved search for solar chameleons with a GridPix detector at CAST

V. Anastassopoulos¹, S. Aune², K. Barth³, A. Belov⁴, H. Bräuninger⁵, G. Cantatore^6,7, J.M. Carmona⁸, J.F. Castel⁸, S.A. Cetin⁹, F. Christensen¹⁰, T. Dafni⁸, M. Davenport³, A. Dermenev⁴, K. Desch¹¹, B. Döbrich³, C. Eleftheriadis¹², G. Fanourakis¹³, E. Ferrer-Ribas², H. Fischer¹⁴, W. Funk³, J.A. Garc𝚤a⁸, A. Gardikiotis¹, J.G. Garza⁸, E.N. Gazis¹⁵, T. Geralis¹³, I. Giomataris², S. Gninenko⁴, C.J. Hailey¹⁶, M.D. Hasinoff¹⁷, D.H.H. Hoffmann¹⁸, F.J. Iguaz⁸, I.G. Irastorza⁸, A. Jakobsen¹⁰, J. Jacoby¹⁹, K. Jakovčić²⁰, J. Kaminski¹¹, M. Karuza²¹, S. Kostoglou³, N. Kralj²¹, M. Krčmar²⁰, C. Krieger¹¹, B. Lakić²⁰, J. M. Laurent³, A. Liolios¹², A. Ljubičić²⁰, G. Luzón⁸, M. Maroudas¹, L. Miceli²², S. Neff²³, I. Ortega^3,8, T. Papaevangelou², K. Paraschou¹², M.J. Pivovaroff²⁴, G. Raffelt²⁵, M. Rosu²³, J. Ruz²⁴, E. Ruiz Chóliz⁸, I. Savvidis¹², S. Schmidt¹¹, Y.K. Semertzidis^22,26, S.K. Solanki²⁷, L. Stewart³, T. Vafeiadis³, J.K. Vogel²⁴, M. Vretenar²¹, W. Wuensch³, S.C. Yildiz⁹, K. Zioutas^1,3 and P. Brax²⁸

Published 16 January 2019 • © 2019 CERN
Journal of Cosmology and Astroparticle Physics, Volume 2019, January 2019 Citation V. Anastassopoulos et al JCAP01(2019)032 DOI 10.1088/1475-7516/2019/01/032

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¹ Physics Department, University of Patras, Patras, Greece

² IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France

³ European Organization for Nuclear Research (CERN), Genève, Switzerland

⁴ Institute for Nuclear Research (INR), Russian Academy of Sciences, Moscow, Russia

⁵ Max-Planck-Institut für Extraterrestrische Physik, Garching, Germany

⁶ Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Trieste, Trieste, Italy

⁷ Università di Trieste, Trieste, Italy

⁸ Grupo de Investigación de Física Nuclear y Astropartículas, Universidad de Zaragoza, Zaragoza, Spain

⁹ Istanbul Bilgi University, High Energy Physics Research Center, Eyup, Istanbul, 34060, Turkey

¹⁰ DTU Space, National Space Institute, Technical University of Denmark, Lyngby, Denmark

¹¹ Physikalisches Institut, University of Bonn, Germany

¹² Aristotle University of Thessaloniki, Thessaloniki, Greece

¹³ National Center for Scientific Research "Demokritos", Athens, Greece

¹⁴ Albert-Ludwigs-Universität Freiburg, Freiburg, Germany

¹⁵ National Technical University of Athens, Athens, Greece

¹⁶ Physics Department and Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027, U.S.A.

¹⁷ Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada

¹⁸ Xi'An Jiaotong University, School of Science, Xi'An, P.R. China

¹⁹ Johann Wolfgang Goethe-Universität, Institut für Angewandte Physik, Frankfurt am Main, Germany

²⁰ Rudjer Bošković Institute, Zagreb, Croatia

²¹ Department of Physics and Centre for Micro and Nano Sciences and Technologies, University of Rijeka, Rijeka, Croatia

²² Center for Axion and Precision Physics Research, Institute for Basic Science (IBS), Daejeon 34141, Republic of Korea

²³ Technische Universität Darmstadt, IKP, Darmstadt, Germany

²⁴ Lawrence Livermore National Laboratory, Livermore, CA 94550, U.S.A.

²⁵ Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), München, Germany

²⁶ Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea

²⁷ Max-Planck-Institut für Sonnensystemforschung, Göttingen, Germany

²⁸ Institut de Physique Théorique, CEA, IPhT, CNRS, URA 2306, F-91191Gif/Yvette Cedex, France

Dates

Received 2 August 2018
Accepted 6 December 2018
Published 16 January 2019

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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≲#5.7×10¹⁰ for 1<β_m<10⁶ 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.

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Improved search for solar chameleons with a GridPix detector at CAST

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