A closer look at the U(1)B−L explanation of the ATOMKI nuclear anomalies

A bstract We revisit the gauged U(1) B−L explanation of the ATOMKI nuclear anomalies, in which the new gauge boson is the hypothetical X (17) particle. It is known that the vanilla B − L scenario is unable to account for appropriate couplings, namely the suppression of the couplings of X (17) to neutrinos, which motivates adding vector-like leptons. The simplest case, in which the new fields have B − L charges equal to 1, is highly disfavoured since it requires large mixing with the Standard Model fields. One solution recently put forward is to consider large B − L charges to counterbalance small mixing. We show that, in this scenario, and after taking into account several phenomenological constraints, the dominant contribution to the muon anomalous magnetic moment ( g − 2) μ is expected to be extremely large and with a negative sign, being thus excluded by experiment.