Axion Searches
arXiv:hep-ph/0002154 · doi:10.1016/S0920-5632(00)00628-9
Abstract
The strong CP problem and its resolution through the existence of an axion are briefly reviewed. The constraints on the axion from accelerator searches, from the evolution of red giants and from supernova SN1987a combine to require eV, where is the axion mass. On the other hand, the constraint that axions do not overclose the universe implies $m_a \gtwid 10^{-6}$ eV. If eV, axions contribute significantly to the cosmological energy density in the form of cold dark matter. Dark matter axions can be detected by resonant conversion to microwave photons in a cavity permeated by a static magnetic field and tuned to the axion mass. Experiments using this effect are described, as well as several other types of axion searches.
12 pages, 2 figures, based on talks at the TAUP99 Conference (Sept. 6-10, 1999, Paris, France) and at Adrianfest (Sept. 24-25, 1999, Rochester, NY)
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