Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

The vector and scalar form factors of the pion to two loops

Bijnens, Johan LU orcid ; Colangelo, Gilberto and Talavera, Pere (1998) In Journal of High Energy Physics 1998(JHEP05(1998)).
Abstract

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.

Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Chiral lagrangians, Spontaneous symmetry breaking
in
Journal of High Energy Physics
volume
1998
issue
JHEP05(1998)
article number
014
publisher
Springer
external identifiers
  • scopus:33645949435
ISSN
1029-8479
DOI
10.1088/1126-6708/1998/05/014
language
English
LU publication?
yes
id
c3343199-9705-4945-827a-217137b8e56d
date added to LUP
2019-05-03 09:06:29
date last changed
2024-04-16 03:58:40
@article{c3343199-9705-4945-827a-217137b8e56d,
  abstract     = {{<p>We calculate the vector and scalar form factors of the pion to two loops in Chiral Perturbation Theory. We estimate the unknown O(p<sup>6</sup>) constants using resonance exchange. We make a careful comparison to the available data and determine two O(p<sup>4</sup>) constants rather precisely, and two O(p<sup>6</sup>) 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 〈r<sup>2</sup>〉<sub>v</sub><sup>π</sup> = 0.437 ± 0.016 fm<sup>2</sup>.</p>}},
  author       = {{Bijnens, Johan and Colangelo, Gilberto and Talavera, Pere}},
  issn         = {{1029-8479}},
  keywords     = {{Chiral lagrangians; Spontaneous symmetry breaking}},
  language     = {{eng}},
  month        = {{12}},
  number       = {{JHEP05(1998)}},
  publisher    = {{Springer}},
  series       = {{Journal of High Energy Physics}},
  title        = {{The vector and scalar form factors of the pion to two loops}},
  url          = {{http://dx.doi.org/10.1088/1126-6708/1998/05/014}},
  doi          = {{10.1088/1126-6708/1998/05/014}},
  volume       = {{1998}},
  year         = {{1998}},
}