Short-distance constraints for the longitudinal component of the hadronic light-by-light amplitude

Author(s)
G. Colangelo, F. Hagelstein, M. Hoferichter, L. Laub, P. Stoffer
Abstract

We reassess the impact of short-distance constraints for the longitudinal component of the hadronic light-by-light amplitude on the anomalous magnetic moment of the muon, aμ= (g- 2) μ/ 2 , by comparing different solutions that have recently appeared in the literature. In particular, we analyze the relevance of the exact axial anomaly and its impact on aμ and conclude that it remains rather limited. We show that all recently proposed solutions agree well within uncertainties on the numerical estimate of the impact of short-distance constraints on aμ, despite differences in the concrete implementation. We also take into account the recently calculated perturbative corrections to the massless quark loop to update our estimate and outline the path towards future improvements.

Organisation(s)
Particle Physics
External organisation(s)
Universität Bern, Paul Scherrer Institute
Journal
European Physical Journal C
Volume
81
No. of pages
13
ISSN
1434-6044
DOI
https://doi.org/10.1140/epjc/s10052-021-09513-x
Publication date
08-2021
Peer reviewed
Yes
Austrian Fields of Science 2012
103034 Particle physics, 103036 Theoretical physics
ASJC Scopus subject areas
Engineering (miscellaneous), Physics and Astronomy (miscellaneous)
Portal url
https://ucris.univie.ac.at/portal/en/publications/shortdistance-constraints-for-the-longitudinal-component-of-the-hadronic-lightbylight-amplitude(46142eb8-906d-4b0f-a55d-b63260e0e580).html