We have searched for light scalar and/or pseudoscalar particles that couple to two photons by studying the propagation of a laser beam ( nm) through a transverse magnetic field. A limit of 3.5× rad was set on a possible optical rotation of the beam polarization for an effective path length of 2.2 km in a 3.25 T magnetic field. We find that the coupling Ge at the 95% confidence level, provided eV. Similar limits can be set from the absence of ellipticity in the transmitted beam. We also searched for photon regeneration in a magnetic field and found the limit Ge for the same range of particle mass.
- Received 5 October 1992
©1993 American Physical Society