https://doi.org/10.1140/epjc/s10052-007-0249-z
Regular Article - Theoretical Physics
Analysis of the vector form factors f+ Kπ(Q2) and f- Kπ(Q2) with light-cone QCD sum rules
1
Department of Physics, North China Electric Power University, Baoding, 071003, P.R. China
2
Department of Modern Physics, University of Science and Technology of China, Hefei, 230026, P.R. China
* e-mail: wangzgyiti@yahoo.com.cn
Received:
17
September
2006
Revised:
28
January
2007
Published online:
15
March
2007
In this article, we calculate the vector form factors f+
Kπ(Q2) and f-
Kπ(Q2) within the framework of the light-cone QCD sum rule approach. The numerical values of f+
Kπ(Q2) are compatible with existing theoretical calculations, and the central value of f+
Kπ(0) (f+
Kπ(0)=0.97) is in excellent agreement with the values from chiral perturbation theory and lattice QCD. The values of |f-
Kπ(0)| are very large compared to the theoretical calculations and experimental data, and they cannot give any reliable prediction. At large momentum transfer with Q2 > 5 GeV2, the form factors f+
Kπ(Q2) and |f-
Kπ(Q2)| can either show the asymptotic behavior of 
or decrease more quickly than ; more experimental data are needed to select the ideal sum rules.
© Springer-Verlag Berlin Heidelberg, 2007
