Improved analysis for the baryon masses to order Lambda_{QCD}/m_Q from QCD sum rules

Details Improved analysis for the baryon masses to order Lambda_{QCD}/m_Q from QCD sum rules Improved analysis for the baryon masses to order Lambda_{QCD}/m_Q from QCD sum rules

2002-01-19

arxiv.org/abs/hep-ph/0201183v2

Phys.Rev. D65 (2002) 094036

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages, revtex, 9 eps figures, misprints corrected, two references added and minor changes to discussion, version to appear

Scientific paper

10.1103/PhysRevD.65.094036

We use the QCD sum rule approach to calculate the masses of the Lambda_Q and Sigma_Q baryons to the Lambda_{QCD}/m_Q order within the framework of heavy quark effective theory. We compare the direct approach and the covariant approach to this problem. Two forms of currents have been adopted in our calculation and their effects on the results are discussed. Numerical results obtained in both direct and covariant approaches are presented. The splitting between spin 1/2 and 3/2 doublets derived from our calculation is {\Sigma_Q^*}^2-\Sigma_Q^2\simeq 0.35\pm 0.03 GeV^2 which is in good agreement with the experiment.

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