Abstract
This minireview aim is to outline the main experimental results related to the search for LDM (light dark matter) at NA64 experiment at CERN. We discuss current results and the NA64 perspectives. Also we discuss the problem of the origin of the photon-dark photon mixing term \(\tfrac{\varepsilon }{2}{{F}^{{\mu \nu }}}F_{{\mu \nu }}^{'}\) and its connection with loop corrections.
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Notes
Here \({{B}_{\mu }}\) is the SM \(U(1)\) gauge field.
Recent discussion of the \(\varepsilon \) parameter origin is contained in [5].
The assumption that \(Br(A{\kern 1pt} ' \to invisible) = 1\) has been used.
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ACKNOWLEDGMENTS
I am indebted to S.N. Gninenko and V.A. Matveev for useful discussions and comments.
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Krasnikov, N.V. The Search for Light Dark Matter at NA64 Experiment. Phys. Part. Nuclei 51, 697–702 (2020). https://doi.org/10.1134/S1063779620040449
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DOI: https://doi.org/10.1134/S1063779620040449