Axions: Recent searches and new limits
arXiv:hep-ph/0504152
Abstract
The CERN Axion Solar Telescope (CAST) experiment searches for solar axions by the "helioscope" method. First results imply an upper limit on the axion-photon coupling of g_a-gamma < 1.16 x 10^-10 GeV^-1 (95% CL) for m_a < 0.02 eV, in this mass range superseding the previous energy-loss limit from globular cluster stars. By virtue of a variable-pressure helium filling of the magnetic transition region, CAST II will extend the sensitivity to axion masses up to about 1 eV, for the first time testing realistic axion parameters in a laboratory experiment. In this mass range axions would contribute a cosmic hot dark matter component. New structure-formation limits imply that m_a < 1-2 eV. For the particular case of hadronic axions with a standard axion-pion coupling, the present-day cosmic axion density would be about 50 cm^-3 and the cosmic mass limit is m_a < 1.05 eV (95% CL). We also comment on the axion interpretation of the anomalous signature observed in the PVLAS experiment.
Contribution to XI International Workshop on "Neutrino Telescopes" (22-25 Feb 2005, Venice, Italy)
References in corpus (16)
- The ratios of the light quark masses
- What do we (not) know theoretically about solar neutrino fluxes?
- Dimming Supernovae without Cosmic Acceleration
- Direct search for solar axions by using strong magnetic field and X-ray detectors
- Hadronic axion window and the big-bang nucleosynthesis
- New cosmological mass limit on thermal relic axions
- Evading Astrophysical Constraints on Axion-Like Particles
- Experimental Search for Solar Axions via Coherent Primakoff Conversion in a Germanium Spectrometer
- Particle Dark Matter and Solar Axion Searches with a small germanium detector at the Canfranc Underground Laboratory
- Cosmic acceleration vs axion-photon mixing
- Axion-photon Couplings in Invisible Axion Models
- Limiting the dimming of distant type Ia supernovae
- Axionic Hot Dark Matter in the Hadronic Axion Window
- Cosmological neutrinos
- Axion-like particles as ultra high energy cosmic rays?
- Cosmological bounds on masses of neutrinos and other thermal relics
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- Production and Detection of Axion-Like Particles at the VUV-FEL: Letter of Intent