Analysis of the vector form factors $f^+_{Kπ}(Q^2)$ and $f^-_{Kπ}(Q^2)$ with light-cone QCD sum rules

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dc.creatorWang, Z. G.
dc.creatorWan, S. L.
dc.date2006-08-15
dc.date2007-02-09
dc.date.accessioned2026-07-07T11:27:05Z
dc.date.available2026-07-07T11:27:05Z
dc.descriptionIn this article, we calculate the vector form factors $f^+_{Kπ}(Q^2)$ and $f^-_{Kπ}(Q^2)$ within the framework of the light-cone QCD sum rules approach. The numerical values of the $f^+_{Kπ}(Q^2)$ are compatible with the existing theoretical calculations, the central value of the $f^+_{Kπ}(0)$, $f^+_{Kπ}(0)=0.97$, is in excellent agreement with the values from the chiral perturbation theory and lattice QCD. The values of the $|f^-_{Kπ}(0)|$ are very large comparing with the theoretical calculations and experimental data, and can not give any reliable predictions. At large momentum transfers with $Q^2> 5GeV^2$, the form factors $f^+_{Kπ}(Q^2)$ and $|f^-_{Kπ}(Q^2)|$ can either take up the asymptotic behavior of $\frac{1}{Q^2}$ or decrease more quickly than $\frac{1}{Q^2}$, more experimental data are needed to select the ideal sum rules.
dc.description22 pages, 16 figures, revised version, to appear in Eur. Phys. J. C
dc.identifierhttps://arxiv.org/abs/hep-ph/0608164
dc.identifierhttp://arxiv.org/abs/hep-ph/0608164
dc.identifierEur.Phys.J.C50:781-791,2007
dc.identifierdoi:10.1140/epjc/s10052-007-0249-z
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/196040
dc.subjectHigh Energy Physics - Phenomenology
dc.titleAnalysis of the vector form factors $f^+_{Kπ}(Q^2)$ and $f^-_{Kπ}(Q^2)$ with light-cone QCD sum rules
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