Implications of last NA64 results and the electron $g_e-2$ anomaly for the X(16.7) boson survival

Abstract

We point out that last NA64 bound on coupling constant of hypothetical $X(16.7MeV)$ vector boson with electrons plus the recent value of the anomalous electron magnetic moment exclude at 90 \% C.L. purely vector or axial vector couplings of $X(16.7)$ boson with electrons. Models with nonzero $V\pm A$ coupling constant with electron survive and they can explain both the electron and muon $g-2$ anomalies.

arXiv comment6 pages

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• Data-driven study of the implications of anomalous magnetic moments and lepton flavor violating processes of $e$, $\mu$ and $\tau$