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Vacuum magnetic birefringence was predicted long time ago and is stilllacking a direct experimental confirmation. Several experimental efforts arestriving to reach this goal, and the sequence of results promises a success inthe next few years. This measurement generally is accompanied by the search forhypothetical light particles that couple to two photons. The PVLAS experimentemploys a sensitive polarimeter based on a high finesse Fabry-Perot cavity. Inthis paper we report on the latest experimental results of this experiment. Thedata are analysed taking into account the intrinsic birefringence of thedielectric mirrors of the cavity. Besides the limit on the vacuum magneticbirefringence, the measurements also allow the model-independent exclusion ofnew regions in the parameter space of axion-like and milli-charged particles.In particular, these last limits hold also for all types of neutrinos,resulting in a laboratory limit on their charge.

The PVLAS experiment: measuring vacuum magnetic birefringence and dichroism with a birefringent Fabry-Perot cavity