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Photo of Johan Bijnens

Johan Bijnens

Professor

Photo of Johan Bijnens

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

Author

  • Johan Bijnens
  • A Khodjamirian

Summary, in English

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.

Department/s

  • Theoretical Particle Physics

Publishing year

2002

Language

English

Pages

67-79

Publication/Series

European Physical Journal C. Particles and Fields

Volume

26

Issue

1

Document type

Journal article

Publisher

Springer

Topic

  • Subatomic Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1434-6044