Dispersion relation for hadronic light-by-light scattering and the muon g-2

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

[img]
Preview
Text
CD15_008.pdf - Published Version
Available under License Creative Commons: Attribution-Noncommercial-No Derivative Works (CC-BY-NC-ND).

Download (216kB) | Preview

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)

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 and 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:

31 Aug 2016 08:18

BORIS DOI:

10.7892/boris.86288

URI:

https://boris.unibe.ch/id/eprint/86288

Actions (login required)

Edit item Edit item
Provide Feedback