期刊
ANNALS OF PHYSICS
卷 323, 期 11, 页码 2851-2872出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.aop.2008.02.001
关键词
Axion; Light shining through a wall; Photon-axion conversion; Axion-photon conversion; WKB/eikonal method; Green function method; Wave matching method
资金
- U.S. Department of Energy [DE-FG02-90ER40542]
- FONDECYT [1050114, 1060079]
- MEC/FULBRIGHT-FU2006-0469
We give a detailed study of axion-photon and photon-axion conversion amplitudes, which enter the analysis of light shining through a wall experiments. Several different calculational methods are employed and compared, and in all cases we retain a nonzero axion mass. To leading order, we find that when the photon frequency w is very close to the axion mass m, there is a threshold cusp which significantly enhances the photon to axion conversion amplitude, by a factor w/ root w(2) - m(2) relative to the corresponding axion to photon conversion process. When m = 0, the enhancement factor reduces to unity and the results of previous calculations are recovered. Our calculations include an exact wave matching analysis, which shows how unitarity is maintained near threshold at w = m, and a discussion of the case when the magnetic field extends into the wall region. (C) 2008 Elsevier Inc. All rights reserved.
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