A closer look at the U(1)_B-L explanation of the ATOMKI nuclear anomalies

2023/11/29 by P. M. Ferreira, Ferreira, P. M., B. L. Gonçalves +3 · 1 citation
Physics and Astronomy · Computer Science · #Particle physics theoretical and experimental studies #Computational Physics and Python Applications #Astrophysics and Cosmic Phenomena

paper · pdf · doi:10.48550/arxiv.2311.18004

Abstract

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.

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• Flavor specific chiral U(1)_X framework for explaining the ATOMKI anomaly

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