Compatibility of CAST search with axion-like interpretation of PVLAS results

Abstract

The PVLAS collaboration has results that may be interpreted in terms of a light axion-like particle, while the CAST collaboration has not found any signal of such particles. We propose a particle physics model with paraphotons and with a low energy scale in which this apparent inconsistency is circumvented.

Comments: 10 pages, 3 figures, version accepted for publication in Physical Review Letters