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The PVLAS experiment: a 25 year effort to measure vacuum magnetic birefringence

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arxiv 2005.12913 v1 pith:OVZ2PKFR submitted 2020-05-26 physics.optics hep-ex

A. Ejlli , F. Della Valle , U. Gastaldi , G. Messineo , R. Pengo , G. Ruoso , G. Zavattini This is my paper · ORCID
classification physics.opticshep-ex
keywords experimentpvlasdeltabirefringencemagnetictimes10vacuumdichroism
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

This paper describes the 25 year effort to measure vacuum magnetic birefringence and dichroism with the PVLAS experiment. The experiment went through two main phases: the first using a rotating superconducting magnet and the second using two rotating permanent magnets. The experiment was not able to reach the predicted value from QED. Nonetheless the experiment set the current best limits on vacuum magnetic birefringence and dichroism for a field of $B_{\rm ext} = 2.5$ T, namely, $\Delta n^{\rm (PVLAS)} = (12\pm17)\times10^{-23}$ and $|\Delta\kappa|^{\rm (PVLAS)} = (10\pm28)\times10^{-23}$. The uncertainty on $\Delta n^{\rm (PVLAS)}$ is about a factor 7 above the predicted value of $\Delta n^{\rm (QED)} = 2.5\times10^{-23}$ @ 2.5 T.

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