2006/09/30 by Zhi-Gang Wang, Z. G. Wang · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1088/0954-3899/34/3/007
published as J.Phys. G34 (2007) 493-504 · 16 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"
openalex publication_date 2007/01/18 · arxiv created 2007/02/03 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
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 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 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 > 3 GeV 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.