Predictive Ability of QCD Sum Rules for Excited Baryons

Details Predictive Ability of QCD Sum Rules for Excited Baryons Predictive Ability of QCD Sum Rules for Excited Baryons

2002-03-19

arxiv.org/abs/nucl-th/0203051v1

Phys.Rev. D66 (2002) 014014

Physics

Nuclear Physics

Nuclear Theory

33 pages, 2 figures

Scientific paper

10.1103/PhysRevD.66.014014

The masses of octet baryons are calculated by the method of QCD sum rules. Using generalized interpolating fields, three independent sets of QCD sum rules are derived which allow the extraction of low-lying N* states with spin-parity 1/2+, 1/2- and 3/2- in both the non-strange and strange channels. The predictive ability of the sum rules is examined by a Monte-Carlo based analysis procedure in which the three phenomenological parameters (mass, coupling, threshold) are treated as free parameters simultaneously. Realistic uncertainties in these parameters are obtained by simultaneously exploring all uncertainties in the QCD input parameters. Those sum rules with good predictive power are identified and their predictions are compared with experiment where available.

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