Johan Bijnens
Professor, Deputy Head of Division
Pion light-by-light contributions to the muon g − 2
Author
Summary, in English
This paper contains some new results on the hadronic light-by-light contribution (HLbL) to the muon g − 2. The first part argues that we can expect large effects from disconnected diagrams in present and future calculations by lattice QCD of HLbL. The argument is based on the dominance of pseudo-scalar meson exchange. In the second part, we revisit the pion loop HLbL contribution to the muon anomalous magnetic moment. We study it in the framework of some models studied earlier, pure pion loop, full VMD and hidden local symmetry for inclusion of vector mesons. In addition we study possible ways to include the axial-vector meson. The main part of the work is a detailed study of how the different momentum regions contribute. We derive a short distance constraint on the γ*γ* → ππ amplitude and use this as a constraint on the models used for the pion loop. As a byproduct we present the general result for integration using the Gegenbauer polynomial method.
Department/s
- Theoretical Particle Physics - Has been reorganised
- Department of Astronomy and Theoretical Physics - Has been reorganised
Publishing year
2016-09-01
Language
English
Publication/Series
Journal of High Energy Physics
Volume
2016
Issue
9
Document type
Journal article
Publisher
Springer
Topic
- Subatomic Physics
Keywords
- Chiral Lagrangians
- Lattice QCD
- Precision QED
Status
Published
ISBN/ISSN/Other
- ISSN: 1029-8479