Indirect new physics effects on $σ_{\rm had}$ confront the $(g-2)_μ$ window discrepancies and the CMD-3 result
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2022
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866917566810685440 |
|---|---|
| author | Darmé, Luc di Cortona, Giovanni Grilli Nardi, Enrico |
| author_facet | Darmé, Luc di Cortona, Giovanni Grilli Nardi, Enrico |
| contents | Recent lattice determinations of the hadronic vacuum polarization contribution to the muon anomalous magnetic moment $a_μ^{\rm HVP}$ have confirmed the discrepancy with the data-driven dispersive method. In the meanwhile the CMD-3 collaboration has reported a result for the $e^+e^-\to π^+π^-$ cross section considerably larger than previous experimental results (and close to the lattice determinations) exacerbating the discordance between different $e^+e^-$ datasets. We explore to what extent these disagreements can be accounted for by some new physics effect altering selectively the individual experimental determinations of $σ(e^+e^- \to\;$hadrons). We find that specific effects of GeV-scale new particles are able to shift upwards the KLOE and BaBar results in the low and intermediate energy windows, while leaving unaffected the CMD-3 energy scan. Although these new physics effects cannot fully explain all the discrepancies among the different $σ(e^+e^- \to\;$hadrons) datasets, they succeed in mitigating the overall tension between data-driven and lattice estimates of $a_μ^{\rm HVP}$. Remarkably, the additional loop corrections involving the new particles concur to solve the residual discrepancy with the experimental value of $(g-2)_μ$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2212_03877 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Indirect new physics effects on $σ_{\rm had}$ confront the $(g-2)_μ$ window discrepancies and the CMD-3 result Darmé, Luc di Cortona, Giovanni Grilli Nardi, Enrico High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice Recent lattice determinations of the hadronic vacuum polarization contribution to the muon anomalous magnetic moment $a_μ^{\rm HVP}$ have confirmed the discrepancy with the data-driven dispersive method. In the meanwhile the CMD-3 collaboration has reported a result for the $e^+e^-\to π^+π^-$ cross section considerably larger than previous experimental results (and close to the lattice determinations) exacerbating the discordance between different $e^+e^-$ datasets. We explore to what extent these disagreements can be accounted for by some new physics effect altering selectively the individual experimental determinations of $σ(e^+e^- \to\;$hadrons). We find that specific effects of GeV-scale new particles are able to shift upwards the KLOE and BaBar results in the low and intermediate energy windows, while leaving unaffected the CMD-3 energy scan. Although these new physics effects cannot fully explain all the discrepancies among the different $σ(e^+e^- \to\;$hadrons) datasets, they succeed in mitigating the overall tension between data-driven and lattice estimates of $a_μ^{\rm HVP}$. Remarkably, the additional loop corrections involving the new particles concur to solve the residual discrepancy with the experimental value of $(g-2)_μ$. |
| title | Indirect new physics effects on $σ_{\rm had}$ confront the $(g-2)_μ$ window discrepancies and the CMD-3 result |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2212.03877 |