Experimental observation of optical rotation generated in vacuum by a magnetic field

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  • 29 July 2005
Abstract
We report the experimental observation of a light polarization rotation in vacuum in the presence of a transverse magnetic field. Assuming that data distribution is Gaussian, the average measured rotation is(3.9+/-0.5)e-12 rad/pass, at 5 T with 44000 passes through a 1 m long magnet. One possible interpretation of this result is the existence of a light, neutral, pseudoscalar particle coupled to two photons.

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