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

Autor(en)

G. Colangelo, F. Hagelstein, M. Hoferichter, L. Laub, P. Stoffer

Abstrakt

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(en)

Teilchenphysik

Externe Organisation(en)

Universität Bern, Paul Scherrer Institute

Journal

European Physical Journal C

Band

81

Anzahl der Seiten

13

ISSN

1434-6044

DOI

https://doi.org/10.1140/epjc/s10052-021-09513-x

Publikationsdatum

08-2021

Peer-reviewed

Ja

ÖFOS 2012

103036 Theoretische Physik, 103034 Teilchenphysik

Schlagwörter

ASJC Scopus Sachgebiete

Engineering (miscellaneous), Physics and Astronomy (miscellaneous)

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/shortdistance-constraints-for-the-longitudinal-component-of-the-hadronic-lightbylight-amplitude(46142eb8-906d-4b0f-a55d-b63260e0e580).html