Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-06-25
Eur.Phys.J.C26:67-79,2002
Physics
High Energy Physics
High Energy Physics - Phenomenology
26 pages, Latex, 6 figures
Scientific paper
10.1140/epjc/s2002-01042-1
We analyze the higher-twist effects and the SU(3)-flavour 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 the 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 $K\to \pi$ weak transition form factors are predicted with $O(m_s)\sim O(m_K^2)$ accuracy.
Bijnens Johan
Khodjamirian Alexander
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