Improved search for solar chameleons with a GridPix detector at CAST

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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, βγlesssim#5.7×1010 for 1<βm<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.
Publisher
IOP PUBLISHING LTD
Issue Date
2019-01
Language
English
Article Type
Article
Citation

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, v.2019, no.1, pp.032

ISSN
1475-7516
DOI
10.1088/1475-7516/2019/01/032
URI
http://hdl.handle.net/10203/250408
Appears in Collection
PH-Journal Papers(저널논문)
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