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+ | ====== TTP02-08 Exploring Light-Cone Sum Rules for Pion and Kaon Form Factors ====== | ||

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+ | <hidden TTP02-08 Exploring Light-Cone Sum Rules for Pion and Kaon Form Factors > 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. | ||

+ | </hidden> | ||

+ | |**Johan Bijnens and Alexander Khodjamirian** | | ||

+ | |** Eur.Phys.J.C 26 67-79 2002 ** | | ||

+ | | {{preprints:2002:ttp02-08.pdf|PDF}} {{preprints:2002:ttp02-08.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/0206252|arXiv]] | | ||

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