Abstract
We explore the physics potential of a terrestrial detector for observing axionic Kaluza-Klein excitations coming from the Sun within the context of higher-dimensional theories of low-scale quantum gravity. In these theories, the heavier Kaluza-Klein axions are relatively short-lived and may be detected by a coincidental triggering of their two-photon decay mode. Because of the expected high multiplicity of the solar axionic excitations, we find experimental sensitivity to a fundamental Peccei-Quinn axion mass up to (corresponding to an effective axion-photon coupling in theories with 2 extra dimensions and a fundamental quantum-gravity scale of order 100 TeV, and up to (corresponding to in theories with 3 extra dimensions and For comparison, based on recent data obtained from lowest level underground experiments, we derive the experimental limits and in the aforementioned theories with 2 and 3 large compact dimensions, respectively.
- Received 5 July 2000
DOI:https://doi.org/10.1103/PhysRevD.62.125011
©2000 American Physical Society