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Addendum to the NA64 Proposal: Search for the $A'\to invisible$ and $X\to e^+e^-$ decays in 2021
The experiment NA64 is aimed at a direct search for sub-GeV vector mediator $A'$ of Dark Matter production in invisible $A'$ decay mode. Another goal is to search for of a new light $X$ boson, which could explain a recently observed excess of $\ee$ events from excited $^8$Be transiti...
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2018
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| Acceso en línea: | http://cds.cern.ch/record/2300189 |