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

Author:
Wang, Zhi-Gang  


Journal:
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS


Issue Date:
2007


Abstract(summary):

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 -> 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 vertical bar Vus vertical bar 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) > 3 GeV2 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.


Page:
493---504


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