Magnetically amplified light-shining-through-walls via virtual minicharged particles

Abstract

We show that magnetic fields have the potential to significantly enhance a recently proposed light-shining-through-walls scenario in quantum-field theories with photons coupling to minicharged particles. Suggesting a dedicated laboratory experiment, we demonstrate that this particular tunneling scenario could provide access to a parameter regime competitive with the currently best direct laboratory limits on minicharged fermions below the $\mathrm{meV}$ regime. With present day technology, such an experiment has the potential to even overcome the best model-independent cosmological bounds on minicharged fermions with masses below $\mathcal{O}(10^{-4})\mathrm{eV}$.

21 pages, 7 figures; some clarifications added, matches journal version

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