New solar axion search in CAST with ⁴He filling

M. Arik , S. Aune , K. Barth , A. Belov , H. Br\"auninger , J. Bremer , V. Burwitz , G. Cantatore

show 55 more authors

J. M. Carmona S. A. Cetin J. I. Collar E. Da Riva T. Dafni M. Davenport A. Dermenev C. Eleftheriadis N. Elias G. Fanourakis E. Ferrer-Ribas J. Gal\'an J. A. Garc\'ia A. Gardikiotis J. G. Garza E. N. Gazis T. Geralis E. Georgiopoulou I. Giomataris S. Gninenko M. G\'omez Marzoa M. D. Hasinoff D. H. H. Hoffmann F. J. Iguaz I. G. Irastorza J. Jacoby K. Jakov\v{c}i\'c M. Karuza M. Kavuk M. Kr\v{c}mar M. Kuster B. Laki\'c J. M. Laurent A. Liolios A. Ljubi\v{c}i\'c G. Luz\'on S. Neff T. Niinikoski A. Nordt I. Ortega T. Papaevangelou M. J. Pivovaroff G. Raffelt A. Rodr\'iguez M. Rosu J. Ruz I. Savvidis I. Shilon S. K. Solanki L. Stewart A. Tom\'as T. Vafeiadis J. Villar J. K. Vogel S. C. Yildiz K. Zioutas (CAST Collaboration)

Authors on Pith no claims yet

classification ✦ hep-ex physics.ins-det

keywords axionmassgammarangesearchcastmagnetpressure

0 comments

read the original abstract

The CERN Axion Solar Telescope (CAST) searches for $a\to\gamma$ conversion in the 9 T magnetic field of a refurbished LHC test magnet that can be directed toward the Sun. Two parallel magnet bores can be filled with helium of adjustable pressure to match the X-ray refractive mass $m_\gamma$ to the axion search mass $m_a$. After the vacuum phase (2003--2004), which is optimal for $m_a\lesssim0.02$ eV, we used $^4$He in 2005--2007 to cover the mass range of 0.02--0.39 eV and $^3$He in 2009--2011 to scan from 0.39--1.17 eV. After improving the detectors and shielding, we returned to $^4$He in 2012 to investigate a narrow $m_a$ range around 0.2 eV ("candidate setting" of our earlier search) and 0.39--0.42 eV, the upper axion mass range reachable with $^4$He, to "cross the axion line" for the KSVZ model. We have improved the limit on the axion-photon coupling to $g_{a\gamma}< 1.47\times10^{-10} {\rm GeV}^{-1}$ (95% C.L.), depending on the pressure settings. Since 2013, we have returned to vacuum and aim for a significant increase in sensitivity.

This paper has not been read by Pith yet.

discussion (0)

Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

Probing Solar Symmetrons with Direct Detection
hep-ph 2026-04 unverdicted novelty 7.0

Solar tachocline production of symmetrons yields a keV-scale flux at Earth whose absorption in xenon detectors provides new complementary bounds on symmetron parameter space.