Colangelo, Gilberto; Stoffer, Peter; Hoferichter, Martin; Procura, Massimiliano (2016). Dispersion relation for hadronic light-by-light scattering and the muon g-2. PoS - proceedings of science, CD15, 008. Scuola Internazionale Superiore di Studi Avanzati SISSA
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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.
Item Type: |
Conference or Workshop Item (Paper) |
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Division/Institute: |
10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC) 08 Faculty of Science > Institute of Theoretical Physics |
UniBE Contributor: |
Colangelo, Gilberto, Stoffer, Peter, Hoferichter, Martin, Procura, Massimiliano |
Subjects: |
500 Science > 530 Physics |
ISSN: |
1824-8039 |
Publisher: |
Scuola Internazionale Superiore di Studi Avanzati SISSA |
Language: |
English |
Submitter: |
Esther Fiechter |
Date Deposited: |
31 Aug 2016 08:18 |
Last Modified: |
05 Dec 2022 14:58 |
BORIS DOI: |
10.7892/boris.86288 |
URI: |
https://boris.unibe.ch/id/eprint/86288 |
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