THE VECTOR AND SCALAR FORM-FACTORS OF THE PION TO 2 LOOPS

Citation
J. Bijnens et al., THE VECTOR AND SCALAR FORM-FACTORS OF THE PION TO 2 LOOPS, JOURNAL OF HIGH ENERGY PHYSICS, (5), 1998, pp. 316-344
Citations number
50
Categorie Soggetti
Physics, Particles & Fields
ISSN journal
10298479
Issue
5
Year of publication
1998
Pages
316 - 344
Database
ISI
SICI code
1029-8479(1998):5<316:TVASFO>2.0.ZU;2-3
Abstract
We calculate the vector and scalar form factors of the pion to two loo ps in Chiral Perturbation Theory. We estimate the unknown O(p(6)) cons tants using resonance exchange. We make a careful comparison to the av ailable data and determine two O(p(4)) constants rather precisely, and two O(p(6)) constants les precisely. We also use Chiral Perturbation Theory to two loops to extract in a model-independent manner the charg e radius of the pion from the available data, and obtain [r(2)](V)(pi) = 0.437 +/- 0.016 fm(2).