Measurement of electromagnetic transition form factors in two-photon collisions at BESIII
Abstract
The muon anomalous magnetic moment, aμ= (g−2)μ/2, shows a sizeable discrepancy between Standard Model (SM) predictions and direct measurements, hinting at either New Physics or limitations in modeling low-energy strong interactions. As the uncertainty in the SM predictions currently exceeds the experimental uncertainty by a substantial margin, further improvements in theoretical precision are essential to clarify the origin of this discrepancy. The SM theoretical uncertainty is dominated by hadronic processes. The hadronic light-by-light (HLbL) scattering contribution relies on highly accurate data for hadron production via two-photon fusion. Operating at √s=3.773 GeV with over 20 fb−1 of integrated luminosity, the BESIII experiment is ideally suited to probe these processes at small momentum transfers. By precisely measuring channels like e+e-→ e+ e-π0 and e+e-→ e+ e-π0π0, BESIII provides the critical experimental input necessary to sharpen the SM prediction and clarify the true nature of the aμ anomaly.
Related
- Measurement of the Higgs boson decay to a low-mass dilepton system and a photon in pp collisions at √s = 13 and 13.6 TeV with the ATLAS detector
- Measurement of isolated photon plus two-jet correlations in Pb+Pb and pp collisions at 5.02 TeV with ATLAS
- Strange Two-Photon Exchange in Time-Like Electromagnetic Form Factors
- Measurement of isolated-prompt photon−hadron correlations in Pb−Pb collisions at √(sNN) = 5.02 TeV
- Photon rings and shadows of black holes with non-minimal couplings between curvature and electromagnetic field
BibTeX
@misc{lellmann2026measurement,
title = {{Measurement of electromagnetic transition form factors in two-photon collisions at BESIII}},
author = {Max Lellmann},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.20511},
eprint = {2610.20511},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.20511},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Measurement of electromagnetic transition form factors in two-photon collisions at BESIII
AU - Max Lellmann
PY - 2026
DA - 2026/10/14
PB - arXiv
DO - 10.48550/arxiv.2610.20511
UR - https://arxiv.org/abs/2610.20511
AB - The muon anomalous magnetic moment, a_μ= (g−2)_μ/2, shows a sizeable discrepancy between Standard Model (SM) predictions and direct measurements, hinting at either New Physics or limitations in modeling low-energy strong interactions. As the uncertainty in the SM predictions currently exceeds the experimental uncertainty by a substantial margin, further improvements in theoretical precision are essential to clarify the origin of this discrepancy. The SM theoretical uncertainty is dominated by hadronic processes. The hadronic light-by-light (HLbL) scattering contribution relies on highly accurate data for hadron production via two-photon fusion. Operating at √s=3.773 GeV with over 20 fb^−1 of integrated luminosity, the BESIII experiment is ideally suited to probe these processes at small momentum transfers. By precisely measuring channels like e^+e^-→ e^+ e^-π^0 and e^+e^-→ e^+ e^-π^0π^0, BESIII provides the critical experimental input necessary to sharpen the SM prediction and clarify the true nature of the a_μ anomaly.
ER -