Institute for Theoretical Particle Physics (TTP)


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preprints:2002:ttp02-08 [2016/03/17 11:03] (current)
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 +====== TTP02-08 Exploring Light-Cone Sum Rules for Pion and Kaon Form Factors ====== 
 +   <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}} {{|PostScript}} [[|arXiv]]   | 
 +| |