The impact of the X17 boson on particle physics anomalies: Muon anomalous magnetic moment, Lamb shift and W mass

Abstract

We show that the $X_{17}$ vector boson, introduced to explain the ${}^8\mathrm{Be}$ anomalous decay, could play a role in the muon’s (electron’s) anomalous magnetic moment and the muonic Lamb shift anomaly. We compute an upper bound on the couplings of $X_{17}$ to leptons and nucleons, analyzing these anomalies. We further constrain the possible kinetic mixing with the $U{\left(1\right)}_Y$ boson of the Standard Model by using the latest available data on the $W$ boson mass.