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)×10^-12 rad/pass, at 5 T with 44 000 passes through a 1 m long magnet, with λ=1064 nm. The relevance of this result in terms of the existence of a light, neutral, spin-zero particle is discussed.
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Zavattini et al. (2006) studied this question.
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