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 , at 5 T with 44 000 passes through a 1 m long magnet, with . The relevance of this result in terms of the existence of a light, neutral, spin-zero particle is discussed.
- Received 29 July 2005
DOI:https://doi.org/10.1103/PhysRevLett.96.110406
©2006 American Physical Society