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We consider an extension of the Standard Model with an extra gauged $U(1)'$symmetry in presence of a 2-Higgs Doublet Model structure of the scalar sector.We show that this scenario is able to explain the anomaly observed by theAtomki collaboration in the decay of an excited state of Beryllium via a lightspin-1 $Z'$ with a mass of 17 MeV.

Explanation of the Beryllium Anomaly in a $U(1)'$-Extended 2-Higgs Doublet Model