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Analysis of the Σ–n form-factors with light-cone QCD sum rules

Author:
Zhi-Gang Wang  


Journal:
Journal of Physics G: Nuclear and Particle Physics


Issue Date:
2007


Abstract(summary):

In this work, we study the four form-factors f1(Q2), f2(Q2), g1(Q2) and g2(Q2) of the Σ → n in the framework of the light-cone QCD sum rules approach up to twist-6 three valence quark light-cone distribution amplitudes. The f1(0) is the basic input parameter in extracting the CKM matrix element |Vus| from the hyperon decays. The four form-factors f1(Q2), f2(Q2), g1(Q2) and g2(Q2) at intermediate and large momentum transfers with Q2 > 3 GeV2 have significant contributions from the end-point (soft) terms. The numerical values of the four form-factors f1(0), f2(0), g1(0) and g2(0) are compatible with the experimental data and theoretical calculations (in magnitude), although the uncertainties are large.


Page:
493-504


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