Johan Bijnens
Professor, Deputy Head of Division
The vector and scalar form factors of the pion to two loops
Author
Summary, in English
We calculate the vector and scalar form factors of the pion to two loops in Chiral Perturbation Theory. We estimate the unknown O(p6) constants using resonance exchange. We make a careful comparison to the available data and determine two O(p4) constants rather precisely, and two O(p6) constants less precisely. We also use Chiral Perturbation Theory to two loops to extract in a model-independent manner the charge radius of the pion from the available data, and obtain 〈r2〉vπ = 0.437 ± 0.016 fm2.
Department/s
- Department of Astronomy and Theoretical Physics - Has been reorganised
Publishing year
1998-12-01
Language
English
Publication/Series
Journal of High Energy Physics
Volume
1998
Issue
JHEP05(1998)
Document type
Journal article
Publisher
Springer
Topic
- Other Physics Topics
Keywords
- Chiral lagrangians
- Spontaneous symmetry breaking
Status
Published
ISBN/ISSN/Other
- ISSN: 1029-8479