Analysis of the $\Sigma -n$ form factors with light-cone QCD sum rules

Abstract

In this work, we study the four form-factors $f_1(Q^2)$, $f_2(Q^2)$, $g_1(Q^2)$ and $g_2(Q^2)$ of the $\Sigma \to n$ in the framework of the light-cone QCD sum rules approach up to twist-6 three valence quark light-cone distribution amplitudes. The $f_1(0)$ is the basic input parameter in extracting the CKM matrix element $|V_{us}|$ from the hyperon decays. The four form-factors $f_1(Q^2)$, $f_2(Q^2)$, $g_1(Q^2)$ and $g_2(Q^2)$ at intermediate and large momentum transfers with $Q^2>3Ge{V}^2$ have significant contributions from the end-point (soft) terms. The numerical values of the four form-factors $f_1(0)$, $f_2(0)$, $g_1(0)$ and $g_2(0)$ are compatible with the experimental data and theoretical calculations (in magnitude); although the uncertainties are large.

arXiv comment16 pages, 4 figures, second version, typos corrected, the article is published in "J. Phys. G34 (2007) 493-504" not in "J. Phys. G34 (2007) 335-346"

References in corpus (19)

• Measurements of the Meson-Photon Transition Form Factors of Light Pseudoscalar Mesons at Large Momentum Transfer
• Nucleon Form Factors in QCD
• Higher Twist Distribution Amplitudes of the Nucleon in QCD
• Semileptonic Hyperon Decays
• SU(3) symmetry breaking in hyperon semileptonic decays
• Light-Cone Sum Rules for the Nucleon Form Factors
• Semileptonic Hyperon Decays and CKM Unitarity
• Improved approach to the heavy-to-light form factors in the light-cone QCD sum
• Beta decay of hyperons in a relativistic quark model
• Improved Light-Cone Sum Rules for the Electromagnetic Form Factors of the Nucleon
• Light Cone Sum Rules for gamma* N -> Delta Transition Form Factors
• Light-cone QCD sum rules for the semileptonic decay Lambda_b --> p lepton anti-neutrino
• V_{us} from hyperon semileptonic decays
• Chiral Corrections to Hyperon Vector Form Factors
• Isospin Breaking in Neutron $\beta$-decay and SU(3) Violation in Semi-leptonic Hyperon Decays
• $B-\pi$ weak form factor with chiral current in the light-cone sum rules
• Chiral Corrections to the Hyperon Vector Form Factors
• Axial form-factor and induced pseudoscalar form-factor of the nucleons
• Scalar form-factor of the proton with light-cone QCD sum rules

Cited by in corpus (13)

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• Radiative decays of the $D_{s0}(2317)$, $D_{s1}(2460)$ and the related strong coupling constants
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• Strong decay ${\Delta }^{++}\to p\pi$ with light-cone QCD sum rules
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• A Comparative Study of $f_B$ within QCD Sum Rules with Two Typical Correlators up to Next-to-Leading Order
• Scalar form factors $f_{\pi \pi }(Q^2)$ and $f_{KK}(Q^2)$ with light-cone QCD sum rules
• Electromagnetic form-factor of the $\pi$ meson with light-cone QCD sum rules