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- W4200633212 abstract "The 4.2$sigma$ discrepancy between the standard model prediction for the muon anomalous magnetic moment $a_mu$ and the experimental result is accompanied by other anomalies. A crucial input for the prediction is the hadronic vacuum polarization $a_mu^{rm HVP}$ inferred from $sigma_{rm had} =sigma(e^+e^- to,$hadrons) data. However, the two most accurate determinations of $sigma_{rm had}$ from KLOE and BaBar disagree by almost 3$,sigma$. Additionally, the combined data-driven result disagrees with the most precise lattice determination of $a_{mu}^{rm HVP}$ by $2.1,sigma$. We argue that all these discrepancies could originate from a $s$-channel new physics contribution to Bhabha scattering hitting a resonance around the KLOE centre of mass energy. This would affect the KLOE luminosity determination, and hence the inferred value of $sigma_{rm had}$. We discuss in detail this possibility, and we describe a simple dark photon model that can reconcile the KLOE and BaBar results for $sigma_{rm had}$, the data-driven and the lattice determinations of $a_mu^{rm HVP}$, and can bring the prediction for $a_mu$ to agree with the experimental result." @default.
- W4200633212 created "2021-12-31" @default.
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- W4200633212 date "2021-12-16" @default.
- W4200633212 modified "2023-09-29" @default.
- W4200633212 title "The muon g-2 anomaly confronts new physics in Bhabha scattering" @default.
- W4200633212 hasPublicationYear "2021" @default.
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