The muon (g-2) Standard-Model prediction and GeV-scale new physics
December 01, 2022
The discrepancy between the standard model (SM) prediction for the muon anomalous magnetic moment and the experimental result is accompanied by other anomalies. A crucial input for the prediction is the hadronic vacuum polarization inferred from hadronic data. However, the two most accurate determinations from KLOE and BaBar disagree by almost $3\sigma$. Additionally, the combined data-driven result also disagrees with the most precise lattice determinations in the intermediate energy window at the level of $\sim 4.2\sigma$. We show with a simple model that all these discrepancies could be accounted for by a new boson produced resonantly around the KLOE centre-of-mass energy and decaying promptly yielding lepton pairs and missing energy in the final states, while complying with all phenomenological constraints.
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