Mathematics – Probability
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..aprv16005k&link_type=abstract
American Physical Society, April Meeting, April 29-May 2, 2000 Long Beach, CA, abstract #V16.005
Mathematics
Probability
Scientific paper
The axion emerged from a minimal and elegant extension of the Standard Model solving the Strong-CP problem in QCD. An axion of sufficiently small mass would have been produced abundantly in the Big Bang, and is thus an excellent Cold Dark Matter candidate. A search is underway for axions which may constitute our galactic halo. In the presence of a magnetic field, an axion can decay into a single photon of the same energy, and the conversion probability is resonantly enhanced in a high-Q microwave cavity. As the expected signal is very weak, the physical temperature of the cavity and the intrinsic noise temperature of the electronics must be reduced to as low as possible. Our experiment has been operational for several years with a single cavity resonator, and has achieved the required power sensitivity (approximately 10-23 Watt) at masses where the axion might plausibly be discovered. We are just commissioning a four-cavity array to cover a higher mass range; results will be presented along with a brief discussion of our plans to increase sensitivity and extend the mass coverage even further.
Andre Marc-Olivier
Asztalos Stephen
Bibber Karl van
Clarke John
Daw Edward
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