QCD Sum Rule for 1/2- Baryons

Details QCD Sum Rule for 1/2- Baryons QCD Sum Rule for 1/2- Baryons

1996-11-14

arxiv.org/abs/hep-ph/9611322v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 page, LaTeX, 5 EPS figures, uses epsf.sty

Scientific paper

The masses of the flavor octet and singlet baryons with negative parity and spin 1/2 are calculated using the QCD sum rule. We find that the chiral symmetry breaking vacuum condensates cause the mass splitting of the positive and negative baryons. The present sum rule reproduces the observed masses of these baryons within 10%, and predicts the mass of the excited Xi baryon with $J^P = {1/2}^{-}$ at 1.63 GeV. We confirm that the negative-parity state, $\Lambda_S-$, is the ground state in the flavor singlet baryon spectrum.

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