Naslov
New solar axion search using the CERN Axion Solar Telescope with He-4 filling

Autori
M. Arik ; S. Aune ; K. Barth ; A. Belov ; H. Bräuninger ; J. Bremer ; V. Burwitz ; G. Cantatore ; 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. Galán ; J. A. García ; A. Gardikiotis ; J. G. Garza ; E. N. Gazis ; T. Geralis ; E. Georgiopoulou ; I. Giomataris ; S. Gninenko ; M. Gómez Marzoa ; M. D. Hasinoff ; D. H. H. Hoffmann ; F. J. Iguaz ; I. G. Irastorza ; J. Jacoby ; Jakovčić, Krešimir ; Karuza, Marin ; M. Kavuk ; Krčmar, Milica ; M. Kuster ; Lakić, Biljana ; J. M. Laurent ; A. Liolios ; Ljubičić, Ante ; G. Luzón ; S. Neff ; T. Niinikoski ; A. Nordt ; I. Ortega ; T. Papaevangelou ; M. J. Pivovaroff ; G. Raffelt ; A. Rodríguez ; M. Rosu ; J. Ruz ; I. Savvidis ; I. Shilon ; S. K. Solanki ; L. Stewart ; A. Tomás ; T. Vafeiadis ; J. Villar ; J. K. Vogel ; S. C. Yildiz ; K. Zioutas

Izvornik
Physical Review D - Particles, Fields, Gravitation, and Cosmology (1550-7998) 92 (2015), 2; 021101-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
strong cp problem ; coherent conversion ; cast experiment ; magnetic-field ; invariance ; detectors ; photons

Sažetak
The CERN Axion Solar Telescope (CAST) searches for a -> 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 less than or similar to 0.02 eV, we used He-4 in 2005-2007 to cover the mass range of 0.02-0.39 eV and He-3 in 2009-2011 to scan from 0.39 to 1.17 eV. After improving the detectors and shielding, we returned to He-4 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 He-4, 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 x 10^(-10) GeV^(-1) (95% C.L.), depending on the pressure settings. Since 2013, we have returned to the vacuum and aim for a significant increase in sensitivity.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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