Dispersion relation for hadronic light-by-light scattering and the muon g-2
By G. Colangelo, P. Stoffer, M. Hoferichter, M. Procura. 2016
144 citations recorded by the source corpus.
The largest uncertainties in the Standard Model calculation of the anomalous magnetic moment of the muon (g 2)m come from hadronic contributions. In particular, it can be expected that in a few years the subleading hadronic light-by-light (HLbL) contribution will dominate the theory uncertainty. We present a dispersive description of the HLbL tensor, which is based on unitarity, analyticity, crossing symmetry, and gauge invariance. Such a model-independent approach opens up an avenue towards a data-driven determination of the HLbL contribution to (g 2)m . The dispersive approach defines unambiguously the pion-pole and the pion-box contribution to the HLbL tensor. Using Mandelstam’s double-spectral representation, we have proven that the pion-box contribution coincides exactly with the one-loop scalar QED amplitude, multiplied by the appropriate pion vector form factors.
Subfields: Artificial Intelligence, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/e40f8a76ac183809b31acf0896e9000b7e3d20b2
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In Nuclear and High Energy Physics
Citations in the corpus
- Short-distance constraints for the HLbL contribution to the muon anomalous magnetic moment (2019, methodology): “We use the notation of [10, 11] to facilitate using our results together with theirs.”