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Exploring light-cone sum rules for pion and kaon form factors

Bijnens, Johan LU and Khodjamirian, A (2002) In European Physical Journal C. Particles and Fields 26(1). p.67-79
Abstract
We analyze the higher-twist effects and the SU(3)-flavor symmetry breaking in the correlation functions used to calculate form factors of pseudoscalar mesons in the QCD light-cone sum rule approach. It is shown that the Ward identities for these correlation functions yield relations between twist-4 two-and three-particle distribution amplitudes. In addition to the relations already obtained from the QCD equations of motions, we have found a new one. With the help of these relations, the twist-4 contribution to the light-cone sum rule for the. pion electromagnetic form factor: is reduced to a very simple form. Simultaneously, we correct a sign error in an earlier calculation. The updated light-cone sum rule prediction for the pion form... (More)
We analyze the higher-twist effects and the SU(3)-flavor symmetry breaking in the correlation functions used to calculate form factors of pseudoscalar mesons in the QCD light-cone sum rule approach. It is shown that the Ward identities for these correlation functions yield relations between twist-4 two-and three-particle distribution amplitudes. In addition to the relations already obtained from the QCD equations of motions, we have found a new one. With the help of these relations, the twist-4 contribution to the light-cone sum rule for the. pion electromagnetic form factor: is reduced to a very simple form. Simultaneously, we correct a sign error in an earlier calculation. The updated light-cone sum rule prediction for the pion form factor at intermediate momentum transfers is compared with the recent Jefferson Lab data. Furthermore, from the correlation functions with strange-quark currents the kaon electromagnetic form factor and the K --> pi weak transition form factors are predicted with O(m(s)) similar to O(m(K)(2)) accuracy. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
European Physical Journal C. Particles and Fields
volume
26
issue
1
pages
67 - 79
publisher
Springer
external identifiers
  • wos:000179929000007
  • scopus:0036879034
ISSN
1434-6044
DOI
10.1140/epjc/s2002-01042-1
language
English
LU publication?
yes
id
6a81657c-0329-4ed8-95ab-91e1c4a264b3 (old id 321334)
date added to LUP
2007-08-10 09:19:53
date last changed
2017-11-19 04:05:29
@article{6a81657c-0329-4ed8-95ab-91e1c4a264b3,
  abstract     = {We analyze the higher-twist effects and the SU(3)-flavor symmetry breaking in the correlation functions used to calculate form factors of pseudoscalar mesons in the QCD light-cone sum rule approach. It is shown that the Ward identities for these correlation functions yield relations between twist-4 two-and three-particle distribution amplitudes. In addition to the relations already obtained from the QCD equations of motions, we have found a new one. With the help of these relations, the twist-4 contribution to the light-cone sum rule for the. pion electromagnetic form factor: is reduced to a very simple form. Simultaneously, we correct a sign error in an earlier calculation. The updated light-cone sum rule prediction for the pion form factor at intermediate momentum transfers is compared with the recent Jefferson Lab data. Furthermore, from the correlation functions with strange-quark currents the kaon electromagnetic form factor and the K --> pi weak transition form factors are predicted with O(m(s)) similar to O(m(K)(2)) accuracy.},
  author       = {Bijnens, Johan and Khodjamirian, A},
  issn         = {1434-6044},
  language     = {eng},
  number       = {1},
  pages        = {67--79},
  publisher    = {Springer},
  series       = {European Physical Journal C. Particles and Fields},
  title        = {Exploring light-cone sum rules for pion and kaon form factors},
  url          = {http://dx.doi.org/10.1140/epjc/s2002-01042-1},
  volume       = {26},
  year         = {2002},
}