Results and perspectives of the solar axion search with the CAST experiment

Ferrer Ribas, E.; Liolios, A.; Collar, J.I.; Hartmann, R.; Silva, P.S.; Yildiz, S.C.; Gninenko, S.; Gomez, H.; Elias, N.; Morales, J.; Zioutas, K.; Garcia, J.A.; Haug, F.; Geralis, T.; Gruber, E.; Raffelt, G.; Savvidis, I.; Tsagri, M.; Brauninger, H.; Arik, M.; Vafeiadis, T.; Irastorza, I.G.; Pivovaroff, M.J.; Lozza, V.; Galan, J.; Carmona, J.M.; Fanourakis, G.; Jacoby, J.; Davenport, M.; Ezer, C.; Karuza, M.; Tomas, A.; Kuster, M.; Gazis, E.N.; Luzon, G.; Vogel, J.K.; Gardikiotis, A.; Hasinoff, M.D.; Dafni, T.; Krcmar, M.; Ljubicic, A.; Laurent, J.M.; Cetin, S.A.; Solanki, S.K.; Kotthaus, R.; Nordt, A.; Riege, H.; Cantatore, G.; Rashba, T.; Konigsmann, K.; Villar, J.; Belov, A.; Papaevangelou, T.; Rosu, M.; Stewart, L.; Rodriguez, A.; Jakovcic, K.; Guthorl, T.; Borghi, S.; Eleftheriadis, C.; Iguaz, F.J.; Aunes, S.; van Bibber, K.; Giomataris, I.; Ruz, J.; Lutz, G.; Niinikoski, T.; Lakic, B.; Hoffmann, D.H.H.; Barth, K.; Friedrich, P.

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Preprint
Report number	arXiv:1209.6347
Title	Results and perspectives of the solar axion search with the CAST experiment
Author(s)	Ferrer Ribas, E. (DAPNIA, Saclay) ; Arik, M. (Dogus U., Kadikoy) ; Aunes, S. (DAPNIA, Saclay) ; Barth, K. (CERN) ; Belov, A. (Moscow, INR) ; Borghi, S. (CERN) ; Brauninger, H. (Garching, Max Planck Inst., MPE) ; Cantatore, G. (INFN, Trieste) ; Carmona, J.M. (Zaragoza U.) ; Cetin, S.A. (DAPNIA, Saclay) ; Collar, J.I. (Chicago U., EFI) ; Dafni, T. (Zaragoza U.) ; Davenport, M. (CERN) ; Eleftheriadis, C. (Aristotle U., Thessaloniki) ; Elias, N. (CERN) ; Ezer, C. (Dogus U., Kadikoy) ; Fanourakis, G. (Democritos Nucl. Res. Ctr.) ; Friedrich, P. (Garching, Max Planck Inst., MPE) ; Galan, J. (Zaragoza U.) ; Garcia, J.A. (Zaragoza U.) ; Gardikiotis, A. (Patras U.) ; Gazis, E.N. (Natl. Tech. U., Athens) ; Geralis, T. (Democritos Nucl. Res. Ctr.) ; Giomataris, I. (DAPNIA, Saclay) ; Gninenko, S. (Moscow, INR) ; Gomez, H. (Zaragoza U.) ; Gruber, E. (Freiburg U.) ; Guthorl, T. (Freiburg U.) ; Hartmann, R. (Munich, Max Planck Inst. HLL) ; Haug, F. (Dogus U., Kadikoy) ; Hasinoff, M.D. (British Columbia U.) ; Hoffmann, D.H.H. (Darmstadt, Tech. Hochsch.) ; Iguaz, F.J. (DAPNIA, Saclay) ; Irastorza, I.G. (Zaragoza U.) ; Jacoby, J. (Frankfurt U.) ; Jakovcic, K. (Boskovic Inst., Zagreb) ; Karuza, M. (INFN, Trieste) ; Konigsmann, K. (Freiburg U.) ; Kotthaus, R. (Munich, Max Planck Inst.) ; Krcmar, M. (Boskovic Inst., Zagreb) ; Kuster, M. (Garching, Max Planck Inst., MPE) ; Lakic, B. (Boskovic Inst., Zagreb) ; Laurent, J.M. (Dogus U., Kadikoy) ; Liolios, A. (Aristotle U., Thessaloniki) ; Ljubicic, A. (Boskovic Inst., Zagreb) ; Lozza, V. (INFN, Trieste) ; Lutz, G. (Munich, Max Planck Inst. HLL) ; Luzon, G. (Zaragoza U.) ; Morales, J. (Zaragoza U.) ; Niinikoski, T. (Dogus U., Kadikoy) ; Nordt, A. (Garching, Max Planck Inst., MPE ; Darmstadt, Tech. Hochsch.) ; Papaevangelou, T. (DAPNIA, Saclay) ; Pivovaroff, M.J. (LLNL, Livermore) ; Raffelt, G. (Munich, Max Planck Inst.) ; Rashba, T. (Lindau, Max Planck Inst.) ; Riege, H. (Darmstadt, Tech. Hochsch.) ; Rodriguez, A. (Zaragoza U.) ; Rosu, M. (Darmstadt, Tech. Hochsch.) ; Ruz, J. (Zaragoza U. ; CERN) ; Savvidis, I. (Aristotle U., Thessaloniki) ; Silva, P.S. (Dogus U., Kadikoy) ; Solanki, S.K. (Lindau, Max Planck Inst.) ; Stewart, L. (Dogus U., Kadikoy) ; Tomas, A. (Zaragoza U.) ; Tsagri, M. (Patras U.) ; van Bibber, K. (LLNL, Livermore) ; Vafeiadis, T. (CERN ; Aristotle U., Thessaloniki) ; Villar, J. (Zaragoza U.) ; Vogel, J.K. (LLNL, Livermore) ; Yildiz, S.C. (Dogus U., Kadikoy) ; Zioutas, K. (Patras U.)
Publication	2012
Imprint	28 Sep 2012
Number of pages	4
Note	Preliminary entry 4 pages, 2 pages, to appear in the proceedings of the 24th Rencontres de Blois V2 A few affiliations were not corrected in previous version V3 Author added
Presented at	24th Rencontres de Blois on "Particle Physics and Cosmology", Blois, Loire Valley, France, 27 May - 1 Jun 2012
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CAST
Abstract	The status of the solar axion search with the CERN Axion Solar Telescope (CAST) will be presented. Recent results obtained by the use of $^3$He as a buffer gas has allowed us to extend our sensitivity to higher axion masses than our previous measurements with $^4$He. With about 1 h of data taking at each of 252 different pressure settings we have scanned the axion mass range 0.39 eV$ \le m_{a} \le $ 0.64 eV. From the absence of an excess of x rays when the magnet was pointing to the Sun we set a typical upper limit on the axion-photon coupling of g$_{a\gamma} \le 2.3\times 10^{-10}$ GeV$^{-1}$ at 95% C.L., the exact value depending on the pressure setting. CAST published results represent the best experimental limit on the photon couplings to axions and other similar exotic particles dubbed WISPs (Weakly Interacting Slim Particles) in the considered mass range and for the first time the limit enters the region favored by QCD axion models. Preliminary sensitivities for axion masses up to 1.16 eV will also be shown reaching mean upper limits on the axion-photon coupling of g$_{a\gamma} \le 3.5\times 10^{-10}$ GeV$^{-1}$ at 95% C.L. Expected sensibilities for the extension of the CAST program up to 2014 will be presented. Moreover long term options for a new helioscope experiment will be evoked.
Other source	Inspire
Copyright/License	arXiv nonexclusive-distrib. 1.0

$\textit{Left: Latest CAST limit on g$_{a\gamma}$ as a function of m$_a$ obtained with the first part the $^3$He data reaching a sensitivity up to 0.64~eV. Right: CAST limits compared to other measurements and bound from theoretical, astrophysical as well as cosmologically derived upper (HDM). The blue line shows the 95\% exclusion limit from published CAST (vacuum phase and $^{4}$He data). The red line shows the 95\% exclusion limit obtained from the analysis of the 2008 $^{3}$He data which has been published in PRL. The Tokyo helioscope limits are also shown. The yellow band indicates the favoured theoretical region for axion models. }$ $\textit{Left: Latest CAST limit on g$_{a\gamma}$ as a function of m$_a$ obtained with the first part the $^3$He data reaching a sensitivity up to 0.64~eV. Right: CAST limits compared to other measurements and bound from theoretical, astrophysical as well as cosmologically derived upper (HDM). The blue line shows the 95\% exclusion limit from published CAST (vacuum phase and $^{4}$He data). The red line shows the 95\% exclusion limit obtained from the analysis of the 2008 $^{3}$He data which has been published in PRL. The Tokyo helioscope limits are also shown. The yellow band indicates the favoured theoretical region for axion models. }$

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