Journal
PHYSICAL REVIEW LETTERS
Volume 128, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.022002
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Funding
- italian Ministero della Universit`a e della Ricerca (MIUR) [PRIN 20172LNEEZ]
- ERC Starting Grant [REINVENT-714788]
- PSC-CUNY Grant [62243-00 50]
- Fellini-Fellowship for Innovation at INFN - European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant [754496]
- Swiss National Science Foundation [200020-175595]
- INFN
- National Science Foundation [PHY-1719690, PHY-1652066]
- COST Action [CA16201]
- Swiss National Science Foundation (SNF) [200020_175595] Funding Source: Swiss National Science Foundation (SNF)
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We present the first fully analytic evaluation of the transition amplitude for the scattering of a massless into a massive pair of fermions at the two-loop level in quantum electrodynamics. Our result has crucial implications for the determination of the electromagnetic coupling in scattering reactions and its impact on the anomalous magnetic moment of the muon.
We present the first fully analytic evaluation of the transition amplitude for the scattering of a massless into a massive pair of fermions at the two-loop level in quantum electrodynamics. Our result is an essential ingredient for the determination of the electromagnetic coupling within scattering reactions, beyond the currently known accuracy, which has a crucial impact on the evaluation of the anomalous magnetic moment of the muon. It will allow, in particular, for a precise determination of the leading hadronic contribution to the (g - 2)0 in the MUonE experiment at CERN, and therefore can be used to shed light on the current discrepancy between the standard model prediction and the experimental measurement for this important physical observable.
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