Exploring lightcone sum rules for pion and kaon form factors
(2002) In European Physical Journal C. Particles and Fields 26(1). p.6779 Abstract
 We analyze the highertwist effects and the SU(3)flavor symmetry breaking in the correlation functions used to calculate form factors of pseudoscalar mesons in the QCD lightcone sum rule approach. It is shown that the Ward identities for these correlation functions yield relations between twist4 twoand threeparticle 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 twist4 contribution to the lightcone 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 lightcone sum rule prediction for the pion form... (More)
 We analyze the highertwist effects and the SU(3)flavor symmetry breaking in the correlation functions used to calculate form factors of pseudoscalar mesons in the QCD lightcone sum rule approach. It is shown that the Ward identities for these correlation functions yield relations between twist4 twoand threeparticle 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 twist4 contribution to the lightcone 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 lightcone 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 strangequark 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)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/record/321334
 author
 Bijnens, Johan ^{LU} and Khodjamirian, A
 organization
 publishing date
 2002
 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
 14346044
 DOI
 10.1140/epjc/s2002010421
 language
 English
 LU publication?
 yes
 id
 6a81657c03294ed895ab91e1c4a264b3 (old id 321334)
 date added to LUP
 20070810 09:19:53
 date last changed
 20180114 03:58:38
@article{6a81657c03294ed895ab91e1c4a264b3, abstract = {We analyze the highertwist effects and the SU(3)flavor symmetry breaking in the correlation functions used to calculate form factors of pseudoscalar mesons in the QCD lightcone sum rule approach. It is shown that the Ward identities for these correlation functions yield relations between twist4 twoand threeparticle 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 twist4 contribution to the lightcone 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 lightcone 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 strangequark 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 = {14346044}, language = {eng}, number = {1}, pages = {6779}, publisher = {Springer}, series = {European Physical Journal C. Particles and Fields}, title = {Exploring lightcone sum rules for pion and kaon form factors}, url = {http://dx.doi.org/10.1140/epjc/s2002010421}, volume = {26}, year = {2002}, }